From b7a0b4a43c19fc13f7459f15133dd99ddf827323 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 19 May 2020 02:54:03 -0700
Subject: [PATCH 01/27] set up react application to use an app's reactrootview

---
 .../windows/ReactUWPTestApp/App.xaml.cs       | 13 ++++-
 .../windows/ReactUWPTestApp/MainPage.xaml     | 24 ++++++++++
 .../windows/ReactUWPTestApp/MainPage.xaml.cs  | 34 ++++++++++++++
 .../ReactUWPTestApp/ReactUWPTestApp.csproj    |  9 ++++
 .../ReactApplication.cpp                      | 47 +++++--------------
 .../Microsoft.ReactNative/ReactApplication.h  |  3 --
 .../ReactApplicationDelegate.cpp              |  2 +-
 .../ReactApplicationDelegate.h                |  2 +
 8 files changed, 95 insertions(+), 39 deletions(-)
 create mode 100644 packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
 create mode 100644 packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs b/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
index 9befe037a84..a0c08cb8ec1 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
+++ b/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
@@ -9,6 +9,8 @@
 using Windows.UI.Core;
 using Windows.UI.ViewManagement;
 using Microsoft.ReactNative.Managed;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
 
 namespace ReactUWPTestApp
 {
@@ -56,11 +58,20 @@ public App()
         protected override void OnLaunched(LaunchActivatedEventArgs e)
         {
             base.OnLaunched(e);
+            var frame = Window.Current.Content as Frame;
+            if (frame == null)
+            {
+                frame = new Frame();
+                Window.Current.Content = frame;
+            }
+            frame.Navigate(typeof(MainPage));
+            Window.Current.Activate();
+
             SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
             ApplicationView.GetForCurrentView().TryResizeView(new Size(800, 600));
             if (DisplayInformation.GetForCurrentView().ResolutionScale != ResolutionScale.Scale100Percent)
             {
-                throw new Exception("A bug requires this app to run at 100% for accurate results - See https://github.com/microsoft/react-native-windows/issues/4619");
+                //throw new Exception("A bug requires this app to run at 100% for accurate results - See https://github.com/microsoft/react-native-windows/issues/4619");
             }
         }
     }
diff --git a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
new file mode 100644
index 00000000000..e91075fa311
--- /dev/null
+++ b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
@@ -0,0 +1,24 @@
+<Page
+    x:Class="ReactUWPTestApp.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:ReactUWPTestApp"
+    xmlns:RNW="using:Microsoft.ReactNative"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+    <StackPanel>
+        <TextBlock Text="Some text that is right aligned" HorizontalAlignment="Right" />
+        <!-- would need to make ReactNativeHost a DependencyProperty for this to work properly i.e. to get updated when set
+            ReactNativeHost="{x:Bind ((local:App)local:App.Current).Host }"
+            -->
+        <Button Content="This is a button"/>
+        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
+            <Image Source="https://microsoft.github.io/react-native-windows/img/header_logo.svg" Width="40" Height="40" />
+            <Image Source="https://img-prod-cms-rt-microsoft-com.akamaized.net/cms/api/am/imageFileData/RE4pkvE?ver=d8fc" Width="40" Height="40" />
+        </StackPanel>
+        <RNW:ReactRootView x:Name="myRootView" ComponentName="ReactUWPTestApp"
+                           Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
+    </StackPanel>
+</Page>
diff --git a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
new file mode 100644
index 00000000000..694a9ac225f
--- /dev/null
+++ b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
@@ -0,0 +1,34 @@
+using Microsoft.ReactNative;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace ReactUWPTestApp
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainPage : Page
+    {
+        public MainPage()
+        {
+            this.InitializeComponent();
+            var app = Application.Current as App;
+            myRootView.ReactNativeHost = app.Host;
+            app.Host.ReloadInstance();
+        }
+    }
+}
diff --git a/packages/E2ETest/windows/ReactUWPTestApp/ReactUWPTestApp.csproj b/packages/E2ETest/windows/ReactUWPTestApp/ReactUWPTestApp.csproj
index 9dc144ee76c..71294f03bc1 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/ReactUWPTestApp.csproj
+++ b/packages/E2ETest/windows/ReactUWPTestApp/ReactUWPTestApp.csproj
@@ -124,6 +124,9 @@
     <Compile Include="App.xaml.cs">
       <DependentUpon>App.xaml</DependentUpon>
     </Compile>
+    <Compile Include="MainPage.xaml.cs">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+    </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ReactPackageProvider.cs" />
     <Compile Include="TreeDumpControlViewManager.cs" />
@@ -175,6 +178,12 @@
       <Name>Microsoft.ReactNative.Managed</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="MainPage.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '16.0' ">
     <VisualStudioVersion>16.0</VisualStudioVersion>
   </PropertyGroup>
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.cpp b/vnext/Microsoft.ReactNative/ReactApplication.cpp
index 17fe4ade491..ab032b8493f 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.cpp
+++ b/vnext/Microsoft.ReactNative/ReactApplication.cpp
@@ -4,6 +4,7 @@
 #include "pch.h"
 #include "ReactApplication.h"
 #include "ReactApplication.g.cpp"
+#include "winrt/Microsoft.ReactNative.h"
 
 #include "IReactDispatcher.h"
 #include "Modules/LinkingManagerModule.h"
@@ -131,6 +132,8 @@ void ReactApplication::OnLaunched(LaunchActivatedEventArgs const &e) {
   this->OnCreate(e);
 }
 
+void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept;
+
 /// <summary>
 /// Invoked when the application is launched normally by the end user.  Other
 /// entry points will be used such as when the application is launched to open a
@@ -138,9 +141,10 @@ void ReactApplication::OnLaunched(LaunchActivatedEventArgs const &e) {
 /// </summary>
 /// <param name="e">Details about the launch request and process.</param>
 void ReactApplication::OnCreate(IActivatedEventArgs const &e) {
-  if (!m_delegate) {
-    m_delegate = CreateReactApplicationDelegate();
-  }
+  //Resuming({this, &ReactApplicationDelegate::OnResuming});
+  //Suspending({this, &ReactApplicationDelegate::OnSuspending});
+  //LeavingBackground({this, &ReactApplicationDelegate::OnLeavingBackground});
+  //EnteredBackground({this, &ReactApplicationDelegate::OnEnteredBackground});
 
 #if defined _DEBUG
   if (IsDebuggerPresent()) {
@@ -179,34 +183,13 @@ void ReactApplication::OnCreate(IActivatedEventArgs const &e) {
       // Restore the saved session state only when appropriate, scheduling the
       // final launch steps after the restore is complete
     }
-
-    if (!isPrelaunchActivated) {
-      if (rootFrame.Content() == nullptr) {
-        // When the navigation stack isn't restored navigate to the first page,
-        // configuring the new page by passing required information as a
-        // navigation parameter
-        content = m_delegate.OnCreate(args);
-        rootFrame.Content(content);
-      }
-
-      // Place the frame in the current Window
-      Window::Current().Content(rootFrame);
-      // Ensure the current window is active
-      Window::Current().Activate();
-    }
-  } else {
-    if (!isPrelaunchActivated) {
-      if (rootFrame.Content() == nullptr) {
-        // When the navigation stack isn't restored navigate to the first page,
-        // configuring the new page by passing required information as a
-        // navigation parameter
-        content = m_delegate.OnCreate(args);
-        rootFrame.Content(content);
-      }
-      // Ensure the current window is active
-      Window::Current().Activate();
-    }
   }
+  //
+  //
+  ApplyArguments(Host(), args.c_str());
+
+  // Nudge the ReactNativeHost to create the instance and wrapping context
+  Host().ReloadInstance();
 }
 
 /// <summary>
@@ -231,8 +214,4 @@ void ReactApplication::OnNavigationFailed(IInspectable const &, NavigationFailed
   throw hresult_error(E_FAIL, hstring(L"Failed to load Page ") + e.SourcePageType().Name);
 }
 
-ReactApplicationDelegate __stdcall ReactApplication::CreateReactApplicationDelegate() {
-  return ReactApplicationDelegate(*this);
-}
-
 } // namespace winrt::Microsoft::ReactNative::implementation
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.h b/vnext/Microsoft.ReactNative/ReactApplication.h
index b17d031257b..2cfaf73fb6a 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.h
+++ b/vnext/Microsoft.ReactNative/ReactApplication.h
@@ -81,15 +81,12 @@ struct ReactApplication : NoDefaultCtorReactApplication_base<ReactApplication> {
   void OnNavigationFailed(IInspectable const &, xaml::Navigation::NavigationFailedEventArgs const &);
 
  protected:
-  virtual ReactApplicationDelegate __stdcall CreateReactApplicationDelegate();
 
  private:
   ReactNative::ReactInstanceSettings m_instanceSettings{nullptr};
   Windows::Foundation::Collections::IVector<IReactPackageProvider> m_packageProviders{nullptr};
   ReactNative::ReactNativeHost m_host{nullptr};
 
-  ReactApplicationDelegate m_delegate{nullptr};
-
   void OnCreate(Windows::ApplicationModel::Activation::IActivatedEventArgs const &e);
 };
 
diff --git a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp
index fc16f11cd2b..274705a4d46 100644
--- a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp
+++ b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp
@@ -20,7 +20,7 @@ using namespace Windows::ApplicationModel::Activation;
 
 namespace winrt::Microsoft::ReactNative::implementation {
 
-static void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept {
+void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept {
   Microsoft::ReactNative::implementation::ReactNativeHost *hostImpl{
       get_self<Microsoft::ReactNative::implementation::ReactNativeHost>(host)};
   if (!arguments.empty() /*&& host.HasInstance()*/) {
diff --git a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
index 4aadc8b89c2..80b09dd63e8 100644
--- a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
+++ b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
@@ -7,6 +7,8 @@
 
 namespace winrt::Microsoft::ReactNative::implementation {
 
+  void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept;
+
 struct ReactApplicationDelegate : ReactApplicationDelegateT<ReactApplicationDelegate> {
   ReactApplicationDelegate() = default;
   ReactApplicationDelegate(xaml::Application const &application) noexcept;

From c313c61662dd0b6df6bc97d4bf4ad927ddff143e Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 19 May 2020 03:07:52 -0700
Subject: [PATCH 02/27] more demo

---
 .../E2ETest/windows/ReactUWPTestApp/MainPage.xaml     | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
index e91075fa311..a49aa52a9df 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
+++ b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
@@ -6,18 +6,19 @@
     xmlns:RNW="using:Microsoft.ReactNative"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:Maps="using:Windows.UI.Xaml.Controls.Maps"
     mc:Ignorable="d"
     Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
     <StackPanel>
-        <TextBlock Text="Some text that is right aligned" HorizontalAlignment="Right" />
-        <!-- would need to make ReactNativeHost a DependencyProperty for this to work properly i.e. to get updated when set
-            ReactNativeHost="{x:Bind ((local:App)local:App.Current).Host }"
-            -->
-        <Button Content="This is a button"/>
+        <Maps:MapControl Height="200" />
         <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
             <Image Source="https://microsoft.github.io/react-native-windows/img/header_logo.svg" Width="40" Height="40" />
             <Image Source="https://img-prod-cms-rt-microsoft-com.akamaized.net/cms/api/am/imageFileData/RE4pkvE?ver=d8fc" Width="40" Height="40" />
+            <TextBlock Text="Some text that is right aligned" HorizontalAlignment="Right" />
         </StackPanel>
+        <!-- would need to make ReactNativeHost a DependencyProperty for this to work properly i.e. to get updated when set
+            ReactNativeHost="{x:Bind ((local:App)local:App.Current).Host }"
+            -->
         <RNW:ReactRootView x:Name="myRootView" ComponentName="ReactUWPTestApp"
                            Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
     </StackPanel>

From 7f245bab6c73c8e92ce0884ef2310667aa24b21a Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 19 May 2020 03:08:41 -0700
Subject: [PATCH 03/27] Change files

---
 ...tive-windows-2020-05-19-03-08-41-reactApplication.json | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 change/react-native-windows-2020-05-19-03-08-41-reactApplication.json

diff --git a/change/react-native-windows-2020-05-19-03-08-41-reactApplication.json b/change/react-native-windows-2020-05-19-03-08-41-reactApplication.json
new file mode 100644
index 00000000000..24c3ade0de9
--- /dev/null
+++ b/change/react-native-windows-2020-05-19-03-08-41-reactApplication.json
@@ -0,0 +1,8 @@
+{
+  "type": "prerelease",
+  "comment": "set up react application to use an app's reactrootview",
+  "packageName": "react-native-windows",
+  "email": "asklar@microsoft.com",
+  "dependentChangeType": "patch",
+  "date": "2020-05-19T10:08:41.333Z"
+}

From be19f9aac9599a162c87ca824d2e3ecfeb0945e2 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 19 May 2020 03:10:05 -0700
Subject: [PATCH 04/27] format

---
 vnext/Microsoft.ReactNative/ReactApplication.cpp       | 8 ++++----
 vnext/Microsoft.ReactNative/ReactApplication.h         | 1 -
 vnext/Microsoft.ReactNative/ReactApplicationDelegate.h | 2 +-
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/vnext/Microsoft.ReactNative/ReactApplication.cpp b/vnext/Microsoft.ReactNative/ReactApplication.cpp
index ab032b8493f..daa38a9ba1d 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.cpp
+++ b/vnext/Microsoft.ReactNative/ReactApplication.cpp
@@ -141,10 +141,10 @@ void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const
 /// </summary>
 /// <param name="e">Details about the launch request and process.</param>
 void ReactApplication::OnCreate(IActivatedEventArgs const &e) {
-  //Resuming({this, &ReactApplicationDelegate::OnResuming});
-  //Suspending({this, &ReactApplicationDelegate::OnSuspending});
-  //LeavingBackground({this, &ReactApplicationDelegate::OnLeavingBackground});
-  //EnteredBackground({this, &ReactApplicationDelegate::OnEnteredBackground});
+  // Resuming({this, &ReactApplicationDelegate::OnResuming});
+  // Suspending({this, &ReactApplicationDelegate::OnSuspending});
+  // LeavingBackground({this, &ReactApplicationDelegate::OnLeavingBackground});
+  // EnteredBackground({this, &ReactApplicationDelegate::OnEnteredBackground});
 
 #if defined _DEBUG
   if (IsDebuggerPresent()) {
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.h b/vnext/Microsoft.ReactNative/ReactApplication.h
index 2cfaf73fb6a..ab34f7e6302 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.h
+++ b/vnext/Microsoft.ReactNative/ReactApplication.h
@@ -81,7 +81,6 @@ struct ReactApplication : NoDefaultCtorReactApplication_base<ReactApplication> {
   void OnNavigationFailed(IInspectable const &, xaml::Navigation::NavigationFailedEventArgs const &);
 
  protected:
-
  private:
   ReactNative::ReactInstanceSettings m_instanceSettings{nullptr};
   Windows::Foundation::Collections::IVector<IReactPackageProvider> m_packageProviders{nullptr};
diff --git a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
index 80b09dd63e8..952b06ccd00 100644
--- a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
+++ b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
@@ -7,7 +7,7 @@
 
 namespace winrt::Microsoft::ReactNative::implementation {
 
-  void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept;
+void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept;
 
 struct ReactApplicationDelegate : ReactApplicationDelegateT<ReactApplicationDelegate> {
   ReactApplicationDelegate() = default;

From 0ffc3f8a0a321a4a68bbe374c513e38b70a30200 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 19 May 2020 12:20:49 -0700
Subject: [PATCH 05/27] remove MainComponent and add MainPage to cs template

---
 .../windows/ReactUWPTestApp/App.xaml.cs       |   2 -
 .../windows/ReactUWPTestApp/MainPage.xaml.cs  |   1 -
 .../Microsoft.ReactNative.vcxproj             |  11 --
 .../Microsoft.ReactNative.vcxproj.filters     |   1 -
 .../ReactApplication.cpp                      |  36 +++--
 .../Microsoft.ReactNative/ReactApplication.h  |   3 -
 .../ReactApplication.idl                      |   1 -
 .../ReactApplicationDelegate.cpp              | 127 ------------------
 .../ReactApplicationDelegate.h                |  40 ------
 .../ReactApplicationDelegate.idl              |  16 ---
 .../templates/cs/proj/MyApp.csproj            |   7 +
 .../templates/cs/src/App.xaml.cs              |  20 ++-
 .../templates/cs/src/MainPage.xaml            |  13 ++
 .../templates/cs/src/MainPage.xaml.cs         |  33 +++++
 14 files changed, 98 insertions(+), 213 deletions(-)
 delete mode 100644 vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp
 delete mode 100644 vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
 delete mode 100644 vnext/Microsoft.ReactNative/ReactApplicationDelegate.idl
 create mode 100644 vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
 create mode 100644 vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml.cs

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs b/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
index a0c08cb8ec1..1dbc01b2e33 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
+++ b/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
@@ -25,8 +25,6 @@ sealed partial class App : ReactApplication
         /// </summary>
         public App()
         {
-            MainComponentName = "ReactUWPTestApp";
-
 #if BUNDLE
             JavaScriptBundleFile = "index.windows";
             InstanceSettings.UseWebDebugger = false;
diff --git a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
index 694a9ac225f..38a6fc2a741 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
+++ b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
@@ -28,7 +28,6 @@ public MainPage()
             this.InitializeComponent();
             var app = Application.Current as App;
             myRootView.ReactNativeHost = app.Host;
-            app.Host.ReloadInstance();
         }
     }
 }
diff --git a/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj b/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj
index b32d9ded3cd..65091db2abb 100644
--- a/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj
+++ b/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj
@@ -320,10 +320,6 @@
     <ClInclude Include="ReactApplication.h">
       <DependentUpon>ReactApplication.idl</DependentUpon>
     </ClInclude>
-    <ClInclude Include="ReactApplicationDelegate.h">
-      <DependentUpon>ReactApplicationDelegate.idl</DependentUpon>
-      <SubType>Code</SubType>
-    </ClInclude>
     <ClInclude Include="IReactContext.h">
       <DependentUpon>IReactContext.idl</DependentUpon>
       <SubType>Code</SubType>
@@ -497,10 +493,6 @@
       <DependentUpon>ReactApplication.idl</DependentUpon>
     </ClCompile>
     <ClCompile Include="$(GeneratedFilesDir)module.g.cpp" />
-    <ClCompile Include="ReactApplicationDelegate.cpp">
-      <DependentUpon>ReactApplicationDelegate.idl</DependentUpon>
-      <SubType>Code</SubType>
-    </ClCompile>
     <ClCompile Include="IReactContext.cpp">
       <DependentUpon>IReactContext.idl</DependentUpon>
       <SubType>Code</SubType>
@@ -572,9 +564,6 @@
     <Midl Include="IViewManager.idl" />
     <Midl Include="NoExceptionAttribute.idl" />
     <Midl Include="ReactApplication.idl" />
-    <Midl Include="ReactApplicationDelegate.idl">
-      <SubType>Designer</SubType>
-    </Midl>
     <Midl Include="IReactContext.idl">
       <SubType>Designer</SubType>
     </Midl>
diff --git a/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj.filters b/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj.filters
index 4824e58dc1d..e74ae69e9eb 100644
--- a/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj.filters
+++ b/vnext/Microsoft.ReactNative/Microsoft.ReactNative.vcxproj.filters
@@ -704,7 +704,6 @@
     <Midl Include="IViewManager.idl" />
     <Midl Include="NoExceptionAttribute.idl" />
     <Midl Include="ReactApplication.idl" />
-    <Midl Include="ReactApplicationDelegate.idl" />
     <Midl Include="ReactInstance.idl" />
     <Midl Include="ReactInstanceSettings.idl" />
     <Midl Include="ReactNativeHost.idl" />
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.cpp b/vnext/Microsoft.ReactNative/ReactApplication.cpp
index daa38a9ba1d..4ed6ee0484b 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.cpp
+++ b/vnext/Microsoft.ReactNative/ReactApplication.cpp
@@ -86,14 +86,6 @@ ReactNative::ReactNativeHost ReactApplication::Host() noexcept {
   return m_host;
 }
 
-hstring ReactApplication::MainComponentName() noexcept {
-  return InstanceSettings().MainComponentName();
-}
-
-void ReactApplication::MainComponentName(hstring const &value) noexcept {
-  InstanceSettings().MainComponentName(value);
-}
-
 bool ReactApplication::UseDeveloperSupport() noexcept {
   return InstanceSettings().UseDeveloperSupport();
 }
@@ -132,7 +124,33 @@ void ReactApplication::OnLaunched(LaunchActivatedEventArgs const &e) {
   this->OnCreate(e);
 }
 
-void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept;
+void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept {
+  Microsoft::ReactNative::implementation::ReactNativeHost *hostImpl{
+      get_self<Microsoft::ReactNative::implementation::ReactNativeHost>(host)};
+  if (!arguments.empty() /*&& host.HasInstance()*/) {
+    constexpr wchar_t delimiter = L' ';
+    std::wistringstream argumentStream(arguments);
+    std::wstring token;
+    while (std::getline(argumentStream, token, delimiter)) {
+      if (token == L"-?") {
+        std::cout << "Options:" << std::endl
+                  << "  --direct-debugging <port>    Enable direct debugging on specified port." << std::endl;
+      } else if (token == L"--direct-debugging") {
+        if (std::getline(argumentStream, token, delimiter)) {
+          const uint16_t port = static_cast<uint16_t>(std::wcstoul(token.c_str(), nullptr, 10));
+          hostImpl->InstanceSettings().UseWebDebugger(false);
+          hostImpl->InstanceSettings().UseDirectDebugger(true);
+          hostImpl->InstanceSettings().DebuggerBreakOnNextLine(true);
+          hostImpl->InstanceSettings().DebuggerPort(port);
+        }
+      }
+    }
+    // TODO: check for 'remoteDebugging'.  Return if not found.  Otherwise,
+    // validate a value is provided and then parse it to set the
+    // ReactInstanceManager.DevSupportManager.IsRemoteDebuggingEnabled flag
+  }
+}
+
 
 /// <summary>
 /// Invoked when the application is launched normally by the end user.  Other
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.h b/vnext/Microsoft.ReactNative/ReactApplication.h
index ab34f7e6302..6ebcf0c63df 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.h
+++ b/vnext/Microsoft.ReactNative/ReactApplication.h
@@ -62,9 +62,6 @@ struct ReactApplication : NoDefaultCtorReactApplication_base<ReactApplication> {
 
   ReactNative::ReactNativeHost Host() noexcept;
 
-  hstring MainComponentName() noexcept;
-  void MainComponentName(hstring const &value) noexcept;
-
   bool UseDeveloperSupport() noexcept;
   void UseDeveloperSupport(bool value) noexcept;
 
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.idl b/vnext/Microsoft.ReactNative/ReactApplication.idl
index 1b62f75856a..e6dcb54d5ca 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.idl
+++ b/vnext/Microsoft.ReactNative/ReactApplication.idl
@@ -15,7 +15,6 @@ namespace Microsoft.ReactNative {
     IVector<IReactPackageProvider> PackageProviders { get; set; };
     ReactNativeHost Host { get; };
 
-    String MainComponentName { get; set; };
     Boolean UseDeveloperSupport { get; set; };
     String JavaScriptMainModuleName { get; set; };
     String JavaScriptBundleFile { get; set; };
diff --git a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp
deleted file mode 100644
index 274705a4d46..00000000000
--- a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.cpp
+++ /dev/null
@@ -1,127 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-#include "pch.h"
-
-#include <winrt/Windows.ApplicationModel.Activation.h>
-
-// ReactApplicationDelegate.h must be included before ReactApplicationDelegate.g.cpp
-#include "ReactApplicationDelegate.h"
-
-#include "ReactApplicationDelegate.g.cpp"
-#include "ReactNativeHost.h"
-#include "ReactSupport.h"
-
-using namespace winrt;
-using namespace Windows::Foundation;
-using namespace xaml;
-using namespace Windows::ApplicationModel;
-using namespace Windows::ApplicationModel::Activation;
-
-namespace winrt::Microsoft::ReactNative::implementation {
-
-void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept {
-  Microsoft::ReactNative::implementation::ReactNativeHost *hostImpl{
-      get_self<Microsoft::ReactNative::implementation::ReactNativeHost>(host)};
-  if (!arguments.empty() /*&& host.HasInstance()*/) {
-    constexpr wchar_t delimiter = L' ';
-    std::wistringstream argumentStream(arguments);
-    std::wstring token;
-    while (std::getline(argumentStream, token, delimiter)) {
-      if (token == L"-?") {
-        std::cout << "Options:" << std::endl
-                  << "  --direct-debugging <port>    Enable direct debugging on specified port." << std::endl;
-      } else if (token == L"--direct-debugging") {
-        if (std::getline(argumentStream, token, delimiter)) {
-          const uint16_t port = static_cast<uint16_t>(std::wcstoul(token.c_str(), nullptr, 10));
-          hostImpl->InstanceSettings().UseWebDebugger(false);
-          hostImpl->InstanceSettings().UseDirectDebugger(true);
-          hostImpl->InstanceSettings().DebuggerBreakOnNextLine(true);
-          hostImpl->InstanceSettings().DebuggerPort(port);
-        }
-      }
-    }
-    // TODO: check for 'remoteDebugging'.  Return if not found.  Otherwise,
-    // validate a value is provided and then parse it to set the
-    // ReactInstanceManager.DevSupportManager.IsRemoteDebuggingEnabled flag
-  }
-}
-
-ReactApplicationDelegate::ReactApplicationDelegate(Application const &application) noexcept
-    : m_application(application) {
-  VerifyElseCrash(application);
-
-  m_reactApplication = application.as<IReactApplication>();
-  VerifyElseCrashSz(m_reactApplication, "Expected argument to implement 'IReactApplication' interface");
-
-  m_application.Resuming({this, &ReactApplicationDelegate::OnResuming});
-  m_application.Suspending({this, &ReactApplicationDelegate::OnSuspending});
-  m_application.LeavingBackground({this, &ReactApplicationDelegate::OnLeavingBackground});
-  m_application.EnteredBackground({this, &ReactApplicationDelegate::OnEnteredBackground});
-}
-
-void ReactApplicationDelegate::OnActivated(IActivatedEventArgs const &args) noexcept {
-  switch (args.Kind()) {
-    case ActivationKind::Protocol:
-      auto protocolArgs = args.as<IProtocolActivatedEventArgs>();
-      // auto uri = protocolArgs.Uri;
-
-      // TODO: Need to support deep linking by integrating with the Linking module
-      if (args.PreviousExecutionState() != ApplicationExecutionState::Running) {
-        // TODO... Figure out the right activation path for PreviousExecutionState
-        VerifyElseCrashSz(
-            false, "ReactApplicationDelegate.OnActivated doesn't handle PreviousExecutionState other than Running");
-      } else {
-        // TODO... Figure out the right activation path
-        OutputDebugStringW(
-            L"ReactApplicationDelegate.OnActivated doesn't handle PreviousExecutionState when its Running");
-      }
-      break;
-  }
-}
-
-// Create the root view for the ReactNative app
-UIElement ReactApplicationDelegate::OnCreate(hstring const &arguments) noexcept {
-  auto host = m_reactApplication.Host();
-
-  ApplyArguments(host, arguments.c_str());
-
-  if (m_reactRootView != nullptr) {
-    return *m_reactRootView;
-  }
-
-  // Nudge the ReactNativeHost to create the instance and wrapping context
-  host.ReloadInstance();
-
-  m_reactRootView = winrt::make_self<ReactRootView>();
-  m_reactRootView->ComponentName(host.InstanceSettings().MainComponentName());
-  m_reactRootView->ReactNativeHost(host);
-
-  auto resources = Application::Current().Resources();
-  auto brush = resources.Lookup(box_value(L"ApplicationPageBackgroundThemeBrush")).as<Media::SolidColorBrush>();
-  m_reactRootView->Background(brush);
-
-  return *m_reactRootView;
-}
-
-void ReactApplicationDelegate::OnResuming(IInspectable const & /*sender*/, IInspectable const & /*args*/) noexcept {
-  OutputDebugStringW(L"ReactApplicationDelegate::OnResuming");
-}
-
-void ReactApplicationDelegate::OnSuspending(IInspectable const & /*sender*/, IInspectable const & /*args*/) noexcept {
-  OutputDebugStringW(L"ReactApplicationDelegate::OnSuspending");
-}
-
-void ReactApplicationDelegate::OnLeavingBackground(
-    IInspectable const & /*sender*/,
-    LeavingBackgroundEventArgs const & /*args*/) noexcept {
-  OutputDebugStringW(L"ReactApplicationDelegate::OnLeavingBackground");
-}
-
-void ReactApplicationDelegate::OnEnteredBackground(
-    IInspectable const & /*sender*/,
-    EnteredBackgroundEventArgs const & /*args*/) noexcept {
-  OutputDebugStringW(L"ReactApplicationDelegate::OnEnteredBackground");
-}
-
-} // namespace winrt::Microsoft::ReactNative::implementation
diff --git a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
deleted file mode 100644
index 952b06ccd00..00000000000
--- a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
+++ /dev/null
@@ -1,40 +0,0 @@
-#pragma once
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-#include "ReactApplicationDelegate.g.h"
-#include "ReactRootView.h"
-
-namespace winrt::Microsoft::ReactNative::implementation {
-
-void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const &arguments) noexcept;
-
-struct ReactApplicationDelegate : ReactApplicationDelegateT<ReactApplicationDelegate> {
-  ReactApplicationDelegate() = default;
-  ReactApplicationDelegate(xaml::Application const &application) noexcept;
-
-  void OnActivated(Windows::ApplicationModel::Activation::IActivatedEventArgs const &args) noexcept;
-  xaml::UIElement OnCreate(hstring const &args) noexcept;
-
- private:
-  void OnResuming(IInspectable const &sender, IInspectable const &args) noexcept;
-  void OnSuspending(IInspectable const &sender, IInspectable const &args) noexcept;
-  void OnLeavingBackground(
-      IInspectable const &sender,
-      Windows::ApplicationModel::LeavingBackgroundEventArgs const &args) noexcept;
-  void OnEnteredBackground(
-      IInspectable const &sender,
-      Windows::ApplicationModel::EnteredBackgroundEventArgs const &args) noexcept;
-
- private:
-  xaml::Application m_application{nullptr};
-  IReactApplication m_reactApplication{nullptr};
-  winrt::com_ptr<ReactRootView> m_reactRootView{nullptr};
-};
-
-} // namespace winrt::Microsoft::ReactNative::implementation
-
-namespace winrt::Microsoft::ReactNative::factory_implementation {
-struct ReactApplicationDelegate
-    : ReactApplicationDelegateT<ReactApplicationDelegate, implementation::ReactApplicationDelegate> {};
-} // namespace winrt::Microsoft::ReactNative::factory_implementation
diff --git a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.idl b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.idl
deleted file mode 100644
index ca596c9f4d6..00000000000
--- a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.idl
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-import "ReactApplication.idl";
-#include "NamespaceRedirect.h"
-
-namespace Microsoft.ReactNative {
-
-  [webhosthidden]
-  unsealed runtimeclass ReactApplicationDelegate {
-    ReactApplicationDelegate();
-    ReactApplicationDelegate(XAML_NAMESPACE.Application application);
-    void OnActivated(Windows.ApplicationModel.Activation.IActivatedEventArgs args);
-    XAML_NAMESPACE.UIElement OnCreate(String args);
-  }
-}
diff --git a/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj b/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj
index 6e9f200af72..8c1d1442b6b 100644
--- a/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj
+++ b/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj
@@ -122,6 +122,9 @@
     <Compile Include="App.xaml.cs">
       <DependentUpon>App.xaml</DependentUpon>
     </Compile>
+    <Compile Include="MainPage.xaml.cs">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+    </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="AutolinkedNativeModules.g.cs" />
   </ItemGroup>
@@ -146,6 +149,10 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <ApplicationDefinition Include="MainPage.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
diff --git a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
index 8ee40b5403b..8bfebeea2e2 100644
--- a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
+++ b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
@@ -6,8 +6,6 @@ sealed partial class App : ReactApplication
     {
         public App()
         {
-            MainComponentName = "<%=name%>";
-
 #if BUNDLE
             JavaScriptBundleFile = "index.windows";
             InstanceSettings.UseWebDebugger = false;
@@ -31,5 +29,23 @@ public App()
 
             InitializeComponent();
         }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="e">Details about the launch request and process.</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+            base.OnLaunched(e);
+            var frame = Window.Current.Content as Frame;
+            if (frame == null)
+            {
+                frame = new Frame();
+                Window.Current.Content = frame;
+            }
+            frame.Navigate(typeof(MainPage));
+            Window.Current.Activate();
+        }
     }
 }
diff --git a/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
new file mode 100644
index 00000000000..2f6b5e8aa0a
--- /dev/null
+++ b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
@@ -0,0 +1,13 @@
+<Page
+    x:Class="ReactUWPTestApp.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:<%=ns%>"
+    xmlns:RNW="using:Microsoft.ReactNative"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+    <RNW:ReactRootView x:Name="reactRootView" ComponentName="<%=name%>"
+        Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
+</Page>
diff --git a/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml.cs b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml.cs
new file mode 100644
index 00000000000..e746893dac6
--- /dev/null
+++ b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml.cs
@@ -0,0 +1,33 @@
+using Microsoft.ReactNative;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace <%=ns%>
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainPage : Page
+    {
+        public MainPage()
+        {
+            this.InitializeComponent();
+            var app = Application.Current as App;
+            reactRootView.ReactNativeHost = app.Host;
+        }
+    }
+}

From 1f665c61e8ac399aca572ab00f11cb31d1219292 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 19 May 2020 14:54:34 -0700
Subject: [PATCH 06/27] cpp template

---
 .../templates/cpp/src/App.cpp                 | 68 ++++++++++++++++++-
 .../templates/cpp/src/MainPage.cpp            | 22 ++++++
 .../templates/cpp/src/MainPage.h              | 25 +++++++
 .../templates/cpp/src/MainPage.idl            |  9 +++
 .../templates/cpp/src/MainPage.xaml           | 13 ++++
 .../templates/cs/src/MainPage.xaml            |  4 +-
 6 files changed, 137 insertions(+), 4 deletions(-)
 create mode 100644 vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
 create mode 100644 vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
 create mode 100644 vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl
 create mode 100644 vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml

diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
index f7afd63819d..a69fe4cc24b 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
@@ -6,6 +6,10 @@
 // clang-format off
 using namespace winrt::<%=ns%>;
 using namespace winrt::<%=ns%>::implementation;
+using namespace winrt;
+using namespace Windows::UI::Xaml;
+using namespace Windows::UI::Xaml::Controls;
+using namespace Windows::UI::Xaml::Navigation;
 
 /// <summary>
 /// Initializes the singleton application object.  This is the first line of
@@ -14,8 +18,6 @@ using namespace winrt::<%=ns%>::implementation;
 /// </summary>
 App::App() noexcept
 {
-    MainComponentName(L"<%=name%>");
-
 #if BUNDLE
     JavaScriptBundleFile(L"index.windows");
     InstanceSettings().UseWebDebugger(false);
@@ -38,3 +40,65 @@ App::App() noexcept
 
     InitializeComponent();
 }
+
+/// <summary>
+/// Invoked when the application is launched normally by the end user.  Other entry points
+/// will be used such as when the application is launched to open a specific file.
+/// </summary>
+/// <param name="e">Details about the launch request and process.</param>
+void App::OnLaunched(LaunchActivatedEventArgs const& e)
+{
+    Frame rootFrame{ nullptr };
+    auto content = Window::Current().Content();
+    if (content)
+    {
+        rootFrame = content.try_as<Frame>();
+    }
+
+    // Do not repeat app initialization when the Window already has content,
+    // just ensure that the window is active
+    if (rootFrame == nullptr)
+    {
+        // Create a Frame to act as the navigation context and associate it with
+        // a SuspensionManager key
+        rootFrame = Frame();
+
+        rootFrame.NavigationFailed({ this, &App::OnNavigationFailed });
+
+        if (e.PreviousExecutionState() == ApplicationExecutionState::Terminated)
+        {
+            // Restore the saved session state only when appropriate, scheduling the
+            // final launch steps after the restore is complete
+        }
+
+        if (e.PrelaunchActivated() == false)
+        {
+            if (rootFrame.Content() == nullptr)
+            {
+                // When the navigation stack isn't restored navigate to the first page,
+                // configuring the new page by passing required information as a navigation
+                // parameter
+                rootFrame.Navigate(xaml_typename<<%=name%>::MainPage>(), box_value(e.Arguments()));
+            }
+            // Place the frame in the current Window
+            Window::Current().Content(rootFrame);
+            // Ensure the current window is active
+            Window::Current().Activate();
+        }
+    }
+    else
+    {
+        if (e.PrelaunchActivated() == false)
+        {
+            if (rootFrame.Content() == nullptr)
+            {
+                // When the navigation stack isn't restored navigate to the first page,
+                // configuring the new page by passing required information as a navigation
+                // parameter
+                rootFrame.Navigate(xaml_typename<<%=name%>::MainPage>(), box_value(e.Arguments()));
+            }
+            // Ensure the current window is active
+            Window::Current().Activate();
+        }
+    }
+}
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
new file mode 100644
index 00000000000..75210dd4d1c
--- /dev/null
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
@@ -0,0 +1,22 @@
+#include "pch.h"
+#include "MainPage.h"
+#include "MainPage.g.cpp"
+#include <winrt/Microsoft.ReactNative.h>
+
+using namespace winrt;
+using namespace Windows::UI::Xaml;
+
+namespace winrt::<%=name%>::implementation {
+MainPage::MainPage() {
+  InitializeComponent();
+  ReactRootView().ReactNativeHost();
+}
+
+winrt::Microsoft::ReactNative::ReactRootView MainPage::ReactRootView() {
+  return m_reactRootView;
+}
+
+void MainPage::ReactRootView(const winrt::Microsoft::ReactNative::ReactRootView &reactRootView) {
+  m_reactRootView = reactRootView;
+}
+} // namespace winrt::<%=name%>::implementation
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
new file mode 100644
index 00000000000..96efe9c98c1
--- /dev/null
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include "MainPage.g.h"
+#include <winrt/Microsoft.ReactNative.h>
+
+namespace winrt::<%=name%>::implementation
+{
+    struct MainPage : MainPageT<MainPage>
+    {
+        MainPage();
+
+        winrt::Microsoft::ReactNative::ReactRootView MainPage::ReactRootView();
+        void MainPage::ReactRootView(const winrt::Microsoft::ReactNative::ReactRootView &);
+
+        private:
+            winrt::Microsoft::ReactNative::ReactRootView m_reactRootView;
+    };
+}
+
+namespace winrt::<%=name%>::factory_implementation
+{
+    struct MainPage : MainPageT<MainPage, implementation::MainPage>
+    {
+    };
+}
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl
new file mode 100644
index 00000000000..ca61ba70284
--- /dev/null
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl
@@ -0,0 +1,9 @@
+namespace <%=ns%>
+{
+    [default_interface]
+    runtimeclass MainPage : <%=XamlNamespace%>.Controls.Page
+    {
+        MainPage();
+        Microsoft.ReactNative.ReactRootView ReactRootView;
+    }
+}
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml
new file mode 100644
index 00000000000..6c30f2ed4bc
--- /dev/null
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml
@@ -0,0 +1,13 @@
+<Page
+    x:Class="ReactUWPTestApp.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:<%=ns%>"
+    xmlns:react="using:Microsoft.ReactNative"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+    <react:ReactRootView x:Name="reactRootView" ComponentName="<%=name%>"
+        Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
+</Page>
diff --git a/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
index 2f6b5e8aa0a..6c30f2ed4bc 100644
--- a/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
+++ b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
@@ -3,11 +3,11 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="using:<%=ns%>"
-    xmlns:RNW="using:Microsoft.ReactNative"
+    xmlns:react="using:Microsoft.ReactNative"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     mc:Ignorable="d"
     Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-    <RNW:ReactRootView x:Name="reactRootView" ComponentName="<%=name%>"
+    <react:ReactRootView x:Name="reactRootView" ComponentName="<%=name%>"
         Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
 </Page>

From b490e0f54b6ed315673bd4a97febacc729685390 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Thu, 21 May 2020 21:12:26 -0700
Subject: [PATCH 07/27] template updates

---
 .../templates/cpp/proj/MyApp.vcxproj          | 12 ++++++++++
 .../templates/cpp/src/App.cpp                 | 24 +++++++++++++++++++
 .../generator-windows/templates/cpp/src/App.h |  5 ++++
 3 files changed, 41 insertions(+)

diff --git a/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj b/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj
index e1ce6a27d50..f7da20fbee5 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj
+++ b/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj
@@ -104,11 +104,17 @@
     <ClInclude Include="App.h">
       <DependentUpon>App.xaml</DependentUpon>
     </ClInclude>
+    <ClInclude Include="MainPage.h">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ApplicationDefinition Include="App.xaml">
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Page Include="MainPage.xaml">
+      <SubType>Designer</SubType>
+    </Page>
   </ItemGroup>
   <ItemGroup>
     <AppxManifest Include="Package.appxmanifest">
@@ -132,12 +138,18 @@
     <ClCompile Include="App.cpp">
       <DependentUpon>App.xaml</DependentUpon>
     </ClCompile>
+    <ClCompile Include="MainPage.cpp">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+    </ClCompile>
     <ClCompile Include="$(GeneratedFilesDir)module.g.cpp" />
   </ItemGroup>
   <ItemGroup>
     <Midl Include="App.idl">
       <DependentUpon>App.xaml</DependentUpon>
     </Midl>
+    <Midl Include="MainPage.idl">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+    </Midl>
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
index a69fe4cc24b..ac30e5bc575 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
@@ -10,6 +10,8 @@ using namespace winrt;
 using namespace Windows::UI::Xaml;
 using namespace Windows::UI::Xaml::Controls;
 using namespace Windows::UI::Xaml::Navigation;
+using namespace Windows::ApplicationModel;
+using namespace Windows::ApplicationModel::Activation;
 
 /// <summary>
 /// Initializes the singleton application object.  This is the first line of
@@ -102,3 +104,25 @@ void App::OnLaunched(LaunchActivatedEventArgs const& e)
         }
     }
 }
+
+/// <summary>
+/// Invoked when application execution is being suspended.  Application state is saved
+/// without knowing whether the application will be terminated or resumed with the contents
+/// of memory still intact.
+/// </summary>
+/// <param name="sender">The source of the suspend request.</param>
+/// <param name="e">Details about the suspend request.</param>
+void App::OnSuspending([[maybe_unused]] IInspectable const& sender, [[maybe_unused]] SuspendingEventArgs const& e)
+{
+    // Save application state and stop any background activity
+}
+
+/// <summary>
+/// Invoked when Navigation to a certain page fails
+/// </summary>
+/// <param name="sender">The Frame which failed navigation</param>
+/// <param name="e">Details about the navigation failure</param>
+void App::OnNavigationFailed(IInspectable const&, NavigationFailedEventArgs const& e)
+{
+    throw hresult_error(E_FAIL, hstring(L"Failed to load Page ") + e.SourcePageType().Name);
+}
\ No newline at end of file
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.h b/vnext/local-cli/generator-windows/templates/cpp/src/App.h
index 229832d4b79..be725209ca1 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.h
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.h
@@ -1,12 +1,17 @@
 #pragma once
 
 #include "App.xaml.g.h"
+ 
+
 // clang-format off
 namespace winrt::<%=ns%>::implementation
 {
     struct App : AppT<App>
     {
         App() noexcept;
+        void OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs const&);
+        void OnSuspending(IInspectable const&, Windows::ApplicationModel::SuspendingEventArgs const&);
+        void OnNavigationFailed(IInspectable const&, Windows::UI::Xaml::Navigation::NavigationFailedEventArgs const&);
     };
 } // namespace winrt::<%=ns%>::implementation
 

From 13b8554f4ef80a356241a44f4a232d7a25a09fb0 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Thu, 21 May 2020 21:23:15 -0700
Subject: [PATCH 08/27] format

---
 .../ReactApplication.cpp                      |  1 -
 .../generator-windows/templates/cpp/src/App.h |  1 -
 .../templates/cpp/src/MainPage.cpp            | 22 +++++++++----------
 3 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/vnext/Microsoft.ReactNative/ReactApplication.cpp b/vnext/Microsoft.ReactNative/ReactApplication.cpp
index 4ed6ee0484b..dbddaa5e6c6 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.cpp
+++ b/vnext/Microsoft.ReactNative/ReactApplication.cpp
@@ -151,7 +151,6 @@ void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const
   }
 }
 
-
 /// <summary>
 /// Invoked when the application is launched normally by the end user.  Other
 /// entry points will be used such as when the application is launched to open a
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.h b/vnext/local-cli/generator-windows/templates/cpp/src/App.h
index be725209ca1..5795c0feb49 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.h
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.h
@@ -1,7 +1,6 @@
 #pragma once
 
 #include "App.xaml.g.h"
- 
 
 // clang-format off
 namespace winrt::<%=ns%>::implementation
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
index 75210dd4d1c..6a2246d23eb 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
@@ -6,17 +6,17 @@
 using namespace winrt;
 using namespace Windows::UI::Xaml;
 
-namespace winrt::<%=name%>::implementation {
-MainPage::MainPage() {
-  InitializeComponent();
-  ReactRootView().ReactNativeHost();
-}
+namespace winrt::<%= name %>::implementation {
+  MainPage::MainPage() {
+    InitializeComponent();
+    ReactRootView().ReactNativeHost();
+  }
 
-winrt::Microsoft::ReactNative::ReactRootView MainPage::ReactRootView() {
-  return m_reactRootView;
-}
+  winrt::Microsoft::ReactNative::ReactRootView MainPage::ReactRootView() {
+    return m_reactRootView;
+  }
 
-void MainPage::ReactRootView(const winrt::Microsoft::ReactNative::ReactRootView &reactRootView) {
-  m_reactRootView = reactRootView;
-}
+  void MainPage::ReactRootView(const winrt::Microsoft::ReactNative::ReactRootView &reactRootView) {
+    m_reactRootView = reactRootView;
+  }
 } // namespace winrt::<%=name%>::implementation

From 158de6315ba9901a6a51957a406567155e5fd20b Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 00:16:56 -0700
Subject: [PATCH 09/27] template

---
 .../windows/ReactUWPTestApp/MainPage.xaml     | 15 ++-------
 .../templates/cpp/proj/MyApp.vcxproj          | 25 +++++++++------
 .../templates/cpp/proj/MyApp.vcxproj.filters  |  3 ++
 .../templates/cpp/src/MainPage.cpp            | 32 ++++++++++---------
 .../templates/cpp/src/MainPage.h              | 18 ++++-------
 .../templates/cpp/src/MainPage.idl            |  1 -
 .../templates/cpp/src/MainPage.xaml           |  8 ++---
 7 files changed, 49 insertions(+), 53 deletions(-)

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
index a49aa52a9df..9d361a496be 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
+++ b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
@@ -3,23 +3,14 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="using:ReactUWPTestApp"
-    xmlns:RNW="using:Microsoft.ReactNative"
+    xmlns:react="using:Microsoft.ReactNative"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-    xmlns:Maps="using:Windows.UI.Xaml.Controls.Maps"
     mc:Ignorable="d"
     Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
     <StackPanel>
-        <Maps:MapControl Height="200" />
-        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
-            <Image Source="https://microsoft.github.io/react-native-windows/img/header_logo.svg" Width="40" Height="40" />
-            <Image Source="https://img-prod-cms-rt-microsoft-com.akamaized.net/cms/api/am/imageFileData/RE4pkvE?ver=d8fc" Width="40" Height="40" />
-            <TextBlock Text="Some text that is right aligned" HorizontalAlignment="Right" />
-        </StackPanel>
-        <!-- would need to make ReactNativeHost a DependencyProperty for this to work properly i.e. to get updated when set
-            ReactNativeHost="{x:Bind ((local:App)local:App.Current).Host }"
-            -->
-        <RNW:ReactRootView x:Name="myRootView" ComponentName="ReactUWPTestApp"
+        <TextBlock x:Name="textBlock" Text="TreeDump text goes here" />
+        <react:ReactRootView x:Name="myRootView" ComponentName="ReactUWPTestApp"
                            Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
     </StackPanel>
 </Page>
diff --git a/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj b/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj
index f7da20fbee5..78c57198545 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj
+++ b/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj
@@ -6,7 +6,7 @@
     <CppWinRTRootNamespaceAutoMerge>true</CppWinRTRootNamespaceAutoMerge>
     <MinimalCoreWin>true</MinimalCoreWin>
     <ProjectGuid>{<%=projectGuid%>}</ProjectGuid>
-    <ProjectName><%=ns%></ProjectName>
+    <ProjectName><%=name%></ProjectName>
     <RootNamespace><%=ns%></RootNamespace>
     <DefaultLanguage>en-US</DefaultLanguage>
     <MinimumVisualStudioVersion>16.0</MinimumVisualStudioVersion>
@@ -99,22 +99,20 @@
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClInclude Include="MainPage.h">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </ClInclude>
     <ClInclude Include="ReactPackageProvider.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="App.h">
       <DependentUpon>App.xaml</DependentUpon>
     </ClInclude>
-    <ClInclude Include="MainPage.h">
-      <DependentUpon>MainPage.xaml</DependentUpon>
-    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ApplicationDefinition Include="App.xaml">
       <SubType>Designer</SubType>
     </ApplicationDefinition>
-    <Page Include="MainPage.xaml">
-      <SubType>Designer</SubType>
-    </Page>
   </ItemGroup>
   <ItemGroup>
     <AppxManifest Include="Package.appxmanifest">
@@ -131,6 +129,10 @@
     <Image Include="Assets\Wide310x150Logo.scale-200.png" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="MainPage.cpp">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </ClCompile>
     <ClCompile Include="ReactPackageProvider.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader>Create</PrecompiledHeader>
@@ -138,9 +140,6 @@
     <ClCompile Include="App.cpp">
       <DependentUpon>App.xaml</DependentUpon>
     </ClCompile>
-    <ClCompile Include="MainPage.cpp">
-      <DependentUpon>MainPage.xaml</DependentUpon>
-    </ClCompile>
     <ClCompile Include="$(GeneratedFilesDir)module.g.cpp" />
   </ItemGroup>
   <ItemGroup>
@@ -149,6 +148,7 @@
     </Midl>
     <Midl Include="MainPage.idl">
       <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
     </Midl>
   </ItemGroup>
   <ItemGroup>
@@ -158,6 +158,11 @@
       <DeploymentContent>false</DeploymentContent>
     </Text>
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="MainPage.xaml">
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <PropertyGroup Label="ReactNativeWindowsNodeProps">
     <ReactNativeWindowsDir Condition="'$(ReactNativeWindowsDir)' == ''">$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), 'node_modules\react-native-windows\package.json'))\node_modules\react-native-windows\</ReactNativeWindowsDir>
diff --git a/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj.filters b/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj.filters
index 13a1efb1a61..1fa33b7299b 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj.filters
+++ b/vnext/local-cli/generator-windows/templates/cpp/proj/MyApp.vcxproj.filters
@@ -55,4 +55,7 @@
   <ItemGroup>
     <Text Include="readme.txt" />
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="MainPage.xaml" />
+  </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
index 6a2246d23eb..de7f7b8e426 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
@@ -1,22 +1,24 @@
-#include "pch.h"
+#include "pch.h"
 #include "MainPage.h"
+#if __has_include("MainPage.g.cpp")
 #include "MainPage.g.cpp"
-#include <winrt/Microsoft.ReactNative.h>
+#endif
+
+#include "App.h"
+
+// clang-format off
 
 using namespace winrt;
 using namespace Windows::UI::Xaml;
 
-namespace winrt::<%= name %>::implementation {
-  MainPage::MainPage() {
-    InitializeComponent();
-    ReactRootView().ReactNativeHost();
-  }
-
-  winrt::Microsoft::ReactNative::ReactRootView MainPage::ReactRootView() {
-    return m_reactRootView;
-  }
+namespace winrt::<%=ns%>::implementation
+{
+    MainPage::MainPage()
+    {
+        InitializeComponent();
+        const auto& app = Application::Current().as<App>();
+        ReactRootView().ReactNativeHost(app->Host());
+    }
+}
 
-  void MainPage::ReactRootView(const winrt::Microsoft::ReactNative::ReactRootView &reactRootView) {
-    m_reactRootView = reactRootView;
-  }
-} // namespace winrt::<%=name%>::implementation
+// clang-format on
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
index 96efe9c98c1..89ece16992c 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
@@ -1,25 +1,21 @@
-#pragma once
-
-#include "MainPage.g.h"
+#pragma once
 #include <winrt/Microsoft.ReactNative.h>
+#include "MainPage.g.h"
 
-namespace winrt::<%=name%>::implementation
+// clang-format off
+namespace winrt::<%=ns%>::implementation
 {
     struct MainPage : MainPageT<MainPage>
     {
         MainPage();
-
-        winrt::Microsoft::ReactNative::ReactRootView MainPage::ReactRootView();
-        void MainPage::ReactRootView(const winrt::Microsoft::ReactNative::ReactRootView &);
-
-        private:
-            winrt::Microsoft::ReactNative::ReactRootView m_reactRootView;
     };
 }
 
-namespace winrt::<%=name%>::factory_implementation
+namespace winrt::testcpp::factory_implementation
 {
     struct MainPage : MainPageT<MainPage, implementation::MainPage>
     {
     };
 }
+
+// clang-format on
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl
index ca61ba70284..4836346b4aa 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.idl
@@ -4,6 +4,5 @@ namespace <%=ns%>
     runtimeclass MainPage : <%=XamlNamespace%>.Controls.Page
     {
         MainPage();
-        Microsoft.ReactNative.ReactRootView ReactRootView;
     }
 }
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml
index 6c30f2ed4bc..f330dce624d 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.xaml
@@ -1,5 +1,5 @@
-<Page
-    x:Class="ReactUWPTestApp.MainPage"
+<Page
+    x:Class="<%=name%>.MainPage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="using:<%=ns%>"
@@ -8,6 +8,6 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     mc:Ignorable="d"
     Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-    <react:ReactRootView x:Name="reactRootView" ComponentName="<%=name%>"
-        Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
+    <react:ReactRootView x:Name="ReactRootView" ComponentName="<%=name%>"
+        Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" MinHeight="400"/>
 </Page>

From 969e425b9130c735f6fa80f4b6c2631893610b7b Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 00:28:36 -0700
Subject: [PATCH 10/27] format

---
 vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
index 89ece16992c..63ad5d5e408 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
@@ -1,6 +1,6 @@
 #pragma once
-#include <winrt/Microsoft.ReactNative.h>
 #include "MainPage.g.h"
+#include <winrt/Microsoft.ReactNative.h>
 
 // clang-format off
 namespace winrt::<%=ns%>::implementation

From 3068fae9a4bb13be5a6d4ec95d2bbecf628cc73e Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 18:03:27 -0700
Subject: [PATCH 11/27] namespace

---
 .../cpp/proj-experimental/MyApp.vcxproj       | 24 ++++++++++++++++---
 .../templates/cpp/src/App.cpp                 |  2 ++
 .../templates/cpp/src/MainPage.h              |  2 +-
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/vnext/local-cli/generator-windows/templates/cpp/proj-experimental/MyApp.vcxproj b/vnext/local-cli/generator-windows/templates/cpp/proj-experimental/MyApp.vcxproj
index 215038b6e54..5ecf444ad69 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/proj-experimental/MyApp.vcxproj
+++ b/vnext/local-cli/generator-windows/templates/cpp/proj-experimental/MyApp.vcxproj
@@ -6,7 +6,7 @@
     <CppWinRTRootNamespaceAutoMerge>true</CppWinRTRootNamespaceAutoMerge>
     <MinimalCoreWin>true</MinimalCoreWin>
     <ProjectGuid>{<%=projectGuid%>}</ProjectGuid>
-    <ProjectName><%=ns%></ProjectName>
+    <ProjectName><%=name%></ProjectName>
     <RootNamespace><%=ns%></RootNamespace>
     <DefaultLanguage>en-US</DefaultLanguage>
     <MinimumVisualStudioVersion>16.0</MinimumVisualStudioVersion>
@@ -67,6 +67,7 @@
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
+  <%=XamlProps%>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -98,6 +99,10 @@
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClInclude Include="MainPage.h">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </ClInclude>
     <ClInclude Include="ReactPackageProvider.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="App.h">
@@ -124,6 +129,10 @@
     <Image Include="Assets\Wide310x150Logo.scale-200.png" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="MainPage.cpp">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </ClCompile>
     <ClCompile Include="ReactPackageProvider.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader>Create</PrecompiledHeader>
@@ -137,6 +146,10 @@
     <Midl Include="App.idl">
       <DependentUpon>App.xaml</DependentUpon>
     </Midl>
+    <Midl Include="MainPage.idl">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Midl>
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
@@ -145,6 +158,11 @@
       <DeploymentContent>false</DeploymentContent>
     </Text>
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="MainPage.xaml">
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <PropertyGroup Label="ReactNativeWindowsNodeProps">
     <ReactNativeWindowsDir Condition="'$(ReactNativeWindowsDir)' == ''">$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), 'node_modules\react-native-windows\package.json'))\node_modules\react-native-windows\</ReactNativeWindowsDir>
@@ -164,7 +182,7 @@
   <ImportGroup Label="ExtensionTargets">
     <Import Project="..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets')" />
     <Import Project="..\packages\Microsoft.ReactNative.<%rnwVersion%>\build\native\Microsoft.ReactNative.targets" Condition="Exists('..\packages\Microsoft.ReactNative.<%rnwVersion%>\build\native\Microsoft.ReactNative.targets')" />
-    <Import Project="..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets')" />
+    <%=XamlTargets%>
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -172,7 +190,7 @@
     </PropertyGroup>
     <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props'))" />
     <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets'))" />
-    <Error Condition="!Exists('..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets'))" />
+    <%=XamlNugetErrors%>
     <Error Condition="!Exists('..\packages\Microsoft.ReactNative.<%rnwVersion%>\build\native\Microsoft.ReactNative.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.ReactNative.<%rnwVersion%>\build\native\Microsoft.ReactNative.targets'))" />
   </Target>
 </Project>
\ No newline at end of file
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
index ac30e5bc575..90bcbc30503 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
@@ -50,6 +50,8 @@ App::App() noexcept
 /// <param name="e">Details about the launch request and process.</param>
 void App::OnLaunched(LaunchActivatedEventArgs const& e)
 {
+    __super::OnLaunched(e);
+
     Frame rootFrame{ nullptr };
     auto content = Window::Current().Content();
     if (content)
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
index 63ad5d5e408..a8fb2cb62e4 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.h
@@ -11,7 +11,7 @@ namespace winrt::<%=ns%>::implementation
     };
 }
 
-namespace winrt::testcpp::factory_implementation
+namespace winrt::<%=ns%>::factory_implementation
 {
     struct MainPage : MainPageT<MainPage, implementation::MainPage>
     {

From 7fc2e4a49fe8a15978e62debfd1ff38e248a5f58 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 18:45:45 -0700
Subject: [PATCH 12/27] cs

---
 .../generator-windows/templates/cs/proj/MyApp.csproj          | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj b/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj
index 8c1d1442b6b..f54fbf520ff 100644
--- a/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj
+++ b/vnext/local-cli/generator-windows/templates/cs/proj/MyApp.csproj
@@ -149,10 +149,10 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
-    <ApplicationDefinition Include="MainPage.xaml">
+    <Page Include="MainPage.xaml">
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
-    </ApplicationDefinition>
+    </Page>
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">

From fd08fbeb0d50cd6f6d369aba3b9f768d938391d6 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 19:06:20 -0700
Subject: [PATCH 13/27] cs using

---
 vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
index 8bfebeea2e2..bb0337f5787 100644
--- a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
+++ b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
@@ -1,4 +1,5 @@
 using Microsoft.ReactNative;
+using Windows.ApplicationModel.Activation;
 
 namespace <%=ns%>
 {

From d8dd3827df15f8be3526b34034fe81ef4ec16268 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 19:25:10 -0700
Subject: [PATCH 14/27] cs using 2

---
 vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
index bb0337f5787..f831acc1713 100644
--- a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
+++ b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
@@ -1,5 +1,7 @@
 using Microsoft.ReactNative;
 using Windows.ApplicationModel.Activation;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
 
 namespace <%=ns%>
 {

From b47d2669b498716a35c4255632896ebe7366c349 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 20:17:20 -0700
Subject: [PATCH 15/27] cs xaml

---
 .../local-cli/generator-windows/templates/cs/src/MainPage.xaml  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
index 6c30f2ed4bc..9563608bd87 100644
--- a/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
+++ b/vnext/local-cli/generator-windows/templates/cs/src/MainPage.xaml
@@ -1,5 +1,5 @@
 <Page
-    x:Class="ReactUWPTestApp.MainPage"
+    x:Class="<%=ns%>.MainPage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="using:<%=ns%>"

From bb132aef8c1bb9d15b70eb86f4f4b6219583e29e Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 20:57:26 -0700
Subject: [PATCH 16/27] sample apps

---
 .../windows/SampleAppCS/App.xaml.cs           | 17 +++++++++-
 .../windows/SampleAppCS/MainPage.xaml         | 13 ++++++++
 .../windows/SampleAppCS/MainPage.xaml.cs      | 31 +++++++++++++++++++
 .../windows/SampleAppCS/SampleAppCS.csproj    | 12 +++++--
 4 files changed, 70 insertions(+), 3 deletions(-)
 create mode 100644 packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml
 create mode 100644 packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml.cs

diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
index 7c5bbd5dc94..1f84cdaae2f 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
@@ -3,6 +3,9 @@
 
 using Microsoft.ReactNative;
 using Microsoft.ReactNative.Managed;
+using Windows.ApplicationModel.Activation;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
 
 namespace SampleAppCS
 {
@@ -19,7 +22,6 @@ sealed partial class App : ReactApplication
         /// </summary>
         public App()
         {
-            MainComponentName = "SampleApp";
 
 #if BUNDLE
             JavaScriptBundleFile = "index.windows";
@@ -47,5 +49,18 @@ public App()
 
             InitializeComponent();
         }
+
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+            base.OnLaunched(e);
+            var frame = Window.Current.Content as Frame;
+            if (frame == null)
+            {
+                frame = new Frame();
+                Window.Current.Content = frame;
+            }
+            frame.Navigate(typeof(MainPage));
+            Window.Current.Activate();
+        }
     }
 }
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml
new file mode 100644
index 00000000000..e16eb3f5c1e
--- /dev/null
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml
@@ -0,0 +1,13 @@
+<Page
+    x:Class="SampleAppCS.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:SampleAppCS"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    xmlns:react="using:Microsoft.ReactNative"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+    <react:ReactRootView x:Name="ReactRootView" ComponentName="SampleApp"/>
+</Page>
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml.cs b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml.cs
new file mode 100644
index 00000000000..bc11e1953fc
--- /dev/null
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainPage.xaml.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace SampleAppCS
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainPage : Page
+    {
+        public MainPage()
+        {
+            this.InitializeComponent();
+            ReactRootView.ReactNativeHost = (Application.Current as App).Host;
+        }
+    }
+}
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj
index 881abebe7d4..bcbba5a61b3 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="16.0" DefaultTargets="Build" 
-  xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="16.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -126,6 +125,9 @@
       <DependentUpon>App.xaml</DependentUpon>
     </Compile>
     <Compile Include="DebugConsole.cs" />
+    <Compile Include="MainPage.xaml.cs">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+    </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -172,6 +174,12 @@
       <Name>SampleLibraryCS</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="MainPage.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '16.0' ">
     <VisualStudioVersion>16.0</VisualStudioVersion>
   </PropertyGroup>

From 4307acd4933ec8b512e232936e22543c91709302 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 22:35:57 -0700
Subject: [PATCH 17/27] sample cpp

---
 .../windows/SampleAppCPP/App.cpp              |  1 -
 .../windows/SampleAppCPP/MainPage.cpp         | 21 ++++++++++
 .../windows/SampleAppCPP/MainPage.h           | 18 ++++++++
 .../windows/SampleAppCPP/MainPage.idl         |  8 ++++
 .../windows/SampleAppCPP/MainPage.xaml        | 12 ++++++
 .../windows/SampleAppCPP/SampleAppCpp.vcxproj | 41 ++++++++++++++++---
 .../SampleAppCPP/SampleAppCpp.vcxproj.filters |  3 ++
 .../windows/SampleAppCPP/packages.config      |  6 ++-
 8 files changed, 103 insertions(+), 7 deletions(-)
 create mode 100644 packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp
 create mode 100644 packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h
 create mode 100644 packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.idl
 create mode 100644 packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.xaml

diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
index 24ef3d664fb..b6d9a2b3d78 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
@@ -17,7 +17,6 @@ namespace winrt::SampleAppCpp::implementation {
 /// WinMain().
 /// </summary>
 App::App() noexcept {
-  MainComponentName(L"SampleApp");
 
 #if BUNDLE
   JavaScriptBundleFile(L"index.windows");
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp
new file mode 100644
index 00000000000..22b3714de72
--- /dev/null
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp
@@ -0,0 +1,21 @@
+#include "pch.h"
+#include "MainPage.h"
+#if __has_include("MainPage.g.cpp")
+#include "MainPage.g.cpp"
+#endif
+
+#include <winrt/Microsoft.ReactNative.h>
+#include <App.h>
+
+using namespace winrt;
+using namespace Windows::UI::Xaml;
+
+namespace winrt::SampleAppCpp::implementation
+{
+    MainPage::MainPage()
+    {
+        InitializeComponent();
+        ReactRootView().ReactNativeHost(Application::Current().as<App>()->Host());
+    }
+
+}
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h
new file mode 100644
index 00000000000..6988481eea9
--- /dev/null
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "MainPage.g.h"
+
+namespace winrt::SampleAppCpp::implementation
+{
+    struct MainPage : MainPageT<MainPage>
+    {
+        MainPage();
+    };
+}
+
+namespace winrt::SampleAppCpp::factory_implementation
+{
+    struct MainPage : MainPageT<MainPage, implementation::MainPage>
+    {
+    };
+}
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.idl b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.idl
new file mode 100644
index 00000000000..632100b9738
--- /dev/null
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.idl
@@ -0,0 +1,8 @@
+namespace SampleAppCpp
+{
+    [default_interface]
+    runtimeclass MainPage : Windows.UI.Xaml.Controls.Page
+    {
+        MainPage();
+    }
+}
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.xaml b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.xaml
new file mode 100644
index 00000000000..3e068afdc89
--- /dev/null
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.xaml
@@ -0,0 +1,12 @@
+<Page
+    x:Class="SampleAppCpp.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:SampleAppCpp"
+    xmlns:react="using:Microsoft.ReactNative"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <react:ReactRootView x:Name="ReactRootView" ComponentName="SampleApp" />
+</Page>
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj
index addc3cc801d..d5da23c61f8 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT License. See LICENSE in the project root for license information. -->
 <Project ToolsVersion="16.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props')" />
+  <Import Project="..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props')" />
+  <Import Project="..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props')" />
+  <Import Project="..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props')" />
   <Import Project="..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props')" />
   <PropertyGroup Label="Globals">
     <CppWinRTOptimized>true</CppWinRTOptimized>
@@ -19,11 +23,11 @@
     <!-- Start Custom .NET Native properties -->
     <DotNetNativeVersion>2.2.7-rel-27913-00</DotNetNativeVersion>
     <!-- The name 'DotNetNativeVersion' is critical for restoring the right .NET framework libraries -->
-    <UWPCoreRuntimeSdkVersion>2.2.9</UWPCoreRuntimeSdkVersion>
+    <UWPCoreRuntimeSdkVersion>2.2.10</UWPCoreRuntimeSdkVersion>
   </PropertyGroup>
   <!-- Start Custom .NET Native targets -->
   <!-- Import all of the .NET Native / CoreCLR props at the beginning of the project -->
-  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\Microsoft.Net.UWPCoreRuntimeSdk.props" />
+  <!-- <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\Microsoft.Net.UWPCoreRuntimeSdk.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props" />
@@ -35,7 +39,7 @@
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary.props" />
-  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.props" />
+  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.props" /> -->
   <!-- End Custom .NET Native targets -->
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup>
@@ -130,6 +134,10 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="DebugConsole.h" />
+    <ClInclude Include="MainPage.h">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </ClInclude>
     <ClInclude Include="ReactPackageProvider.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="App.h">
@@ -157,6 +165,10 @@
     <Image Include="Assets\Wide310x150Logo.scale-200.png" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="MainPage.cpp">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </ClCompile>
     <ClCompile Include="ReactPackageProvider.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader>Create</PrecompiledHeader>
@@ -170,6 +182,10 @@
     <Midl Include="App.idl">
       <DependentUpon>App.xaml</DependentUpon>
     </Midl>
+    <Midl Include="MainPage.idl">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Midl>
   </ItemGroup>
   <ItemGroup>
     <None Include="PropertySheet.props" />
@@ -191,10 +207,18 @@
       <Project>{c0a6bd9c-3ee5-4b12-8ce4-cee95178539c}</Project>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="MainPage.xaml">
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
     <Import Project="..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets')" />
     <Import Project="..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets')" />
+    <Import Project="..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets" Condition="Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets')" />
+    <Import Project="..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets" Condition="Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets')" />
+    <Import Project="..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets" Condition="Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets')" />
   </ImportGroup>
   <Import Project="$(ReactNativeWindowsDir)\PropertySheets\Bundle.props" />
   <Import Project="$(ReactNativeWindowsDir)\PropertySheets\Bundle.Cpp.targets" />
@@ -205,6 +229,13 @@
     <Error Condition="!Exists('..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets'))" />
     <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props'))" />
     <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets'))" />
+    <Error Condition="!Exists('..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
+    <Error Condition="!Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
+    <Error Condition="!Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets'))" />
+    <Error Condition="!Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
+    <Error Condition="!Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets'))" />
+    <Error Condition="!Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
+    <Error Condition="!Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets'))" />
   </Target>
   <!-- Start Custom .NET Native targets -->
   <!-- Add a workaround to make sure the .NET framework libraries are correctly copied to the AppX folder in Debug (CoreCLR) mode -->
@@ -218,7 +249,7 @@
     </ItemGroup>
   </Target>
   <!-- Import all of the .NET Native / CoreCLR targets at the end of the project -->
-  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
+  <!-- <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\Microsoft.Net.Native.Compiler\$(DotNetNativeVersion)\build\Microsoft.Net.Native.Compiler.targets" />
@@ -229,6 +260,6 @@
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary.targets" />
-  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.targets" />
+  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.targets" /> -->
   <!-- End Custom .NET Native targets -->
 </Project>
\ No newline at end of file
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj.filters b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj.filters
index 872971f9b86..de9839ae11c 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj.filters
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj.filters
@@ -59,4 +59,7 @@
   <ItemGroup>
     <Natvis Include="$(ReactNativeWindowsDir)\Folly\Folly.natvis" />
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="MainPage.xaml" />
+  </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config
index 24369e62645..57aef77374e 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config
@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
   <package id="Microsoft.UI.Xaml" version="2.3.191129002" targetFramework="native" />
   <package id="Microsoft.Windows.CppWinRT" version="2.0.200316.3" targetFramework="native" />
-</packages>
+  <package id="runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
+  <package id="runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
+  <package id="runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
+</packages>
\ No newline at end of file

From 9fd27c937e20cbbfff875b2d632c777d3500cc89 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Fri, 22 May 2020 22:59:15 -0700
Subject: [PATCH 18/27] format

---
 .../windows/SampleAppCPP/App.cpp              |  1 -
 .../windows/SampleAppCPP/MainPage.cpp         | 16 +++++++-------
 .../windows/SampleAppCPP/MainPage.h           | 21 +++++++------------
 3 files changed, 15 insertions(+), 23 deletions(-)

diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
index b6d9a2b3d78..e5fcadb6a10 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
@@ -17,7 +17,6 @@ namespace winrt::SampleAppCpp::implementation {
 /// WinMain().
 /// </summary>
 App::App() noexcept {
-
 #if BUNDLE
   JavaScriptBundleFile(L"index.windows");
   InstanceSettings().UseWebDebugger(false);
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp
index 22b3714de72..9db5da89bc7 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.cpp
@@ -4,18 +4,16 @@
 #include "MainPage.g.cpp"
 #endif
 
-#include <winrt/Microsoft.ReactNative.h>
 #include <App.h>
+#include <winrt/Microsoft.ReactNative.h>
 
 using namespace winrt;
 using namespace Windows::UI::Xaml;
 
-namespace winrt::SampleAppCpp::implementation
-{
-    MainPage::MainPage()
-    {
-        InitializeComponent();
-        ReactRootView().ReactNativeHost(Application::Current().as<App>()->Host());
-    }
-
+namespace winrt::SampleAppCpp::implementation {
+MainPage::MainPage() {
+  InitializeComponent();
+  ReactRootView().ReactNativeHost(Application::Current().as<App>()->Host());
 }
+
+} // namespace winrt::SampleAppCpp::implementation
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h
index 6988481eea9..908066b496d 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainPage.h
@@ -2,17 +2,12 @@
 
 #include "MainPage.g.h"
 
-namespace winrt::SampleAppCpp::implementation
-{
-    struct MainPage : MainPageT<MainPage>
-    {
-        MainPage();
-    };
-}
+namespace winrt::SampleAppCpp::implementation {
+struct MainPage : MainPageT<MainPage> {
+  MainPage();
+};
+} // namespace winrt::SampleAppCpp::implementation
 
-namespace winrt::SampleAppCpp::factory_implementation
-{
-    struct MainPage : MainPageT<MainPage, implementation::MainPage>
-    {
-    };
-}
+namespace winrt::SampleAppCpp::factory_implementation {
+struct MainPage : MainPageT<MainPage, implementation::MainPage> {};
+} // namespace winrt::SampleAppCpp::factory_implementation

From 82824c502658338c2c9283754a19552fa9d9a300 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Sat, 23 May 2020 00:24:20 -0700
Subject: [PATCH 19/27] size message

---
 .../windows/ReactUWPTestApp/TreeDumpControlViewManager.cs      | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/TreeDumpControlViewManager.cs b/packages/E2ETest/windows/ReactUWPTestApp/TreeDumpControlViewManager.cs
index fff0cb61c74..0d0bc55b359 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/TreeDumpControlViewManager.cs
+++ b/packages/E2ETest/windows/ReactUWPTestApp/TreeDumpControlViewManager.cs
@@ -32,11 +32,12 @@ public FrameworkElement CreateView()
             m_textBlock.IsTextSelectionEnabled = false;
             m_textBlock.LayoutUpdated += (source, e) =>
             {
+                ApplicationView.GetForCurrentView().TryResizeView(new Size(800, 600));
                 var bounds = ApplicationView.GetForCurrentView().VisibleBounds;
                 if (bounds.Width != 800 || bounds.Height != 600)
                 {
                     // Dump disabled when window size is not 800x600!
-                    UpdateResult(false /*matchDump*/ , "Window has been resized, dump comparison is only valid at default launch size: 800x600!, current size:" + bounds.ToString());
+                    UpdateResult(false /*matchDump*/ , $"Window has been resized, dump comparison is only valid at default launch size: 800x600!, current size: {bounds.Width}x{bounds.Height}");
                 }
                 else
                 {

From 9d98e0824ee2980e5f70b5fb024f38f5a42cb02f Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Sat, 23 May 2020 00:29:40 -0700
Subject: [PATCH 20/27] size exception, 4619 is fixed

---
 packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs b/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
index 1dbc01b2e33..b8561511bb1 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
+++ b/packages/E2ETest/windows/ReactUWPTestApp/App.xaml.cs
@@ -67,10 +67,6 @@ protected override void OnLaunched(LaunchActivatedEventArgs e)
 
             SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
             ApplicationView.GetForCurrentView().TryResizeView(new Size(800, 600));
-            if (DisplayInformation.GetForCurrentView().ResolutionScale != ResolutionScale.Scale100Percent)
-            {
-                //throw new Exception("A bug requires this app to run at 100% for accurate results - See https://github.com/microsoft/react-native-windows/issues/4619");
-            }
         }
     }
 }

From ad718c8b9cf772b9cb223d8a3702a4b9ef2b66fd Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Sat, 23 May 2020 01:11:51 -0700
Subject: [PATCH 21/27] run_wdio msg

---
 packages/E2ETest/run_wdio.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/E2ETest/run_wdio.js b/packages/E2ETest/run_wdio.js
index d44e57e1957..80cbed2a0dd 100644
--- a/packages/E2ETest/run_wdio.js
+++ b/packages/E2ETest/run_wdio.js
@@ -117,6 +117,7 @@ function parseLogs() {
 }
 
 function printFailedTests(ft) {
+  console.log('Failed test cases: ');
   for (const key in ft) {
     console.log(chalk.redBright(key));
     console.log(
@@ -133,8 +134,9 @@ function printFailedTests(ft) {
 function doProcess(code) {
   const failedTests = parseLogs();
   for (const failedTest of failedTests) {
-    console.log('Failed tests: ');
-    printFailedTests(failedTest);
+    if (Object.keys(failedTest)) {
+      printFailedTests(failedTest);
+    }
   }
   process.exit(code);
 }

From 8d0d4d0e72967aaee820371c4a8b928620afaa3b Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Sat, 23 May 2020 02:02:36 -0700
Subject: [PATCH 22/27] wdio failed tests msg

---
 packages/E2ETest/run_wdio.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/E2ETest/run_wdio.js b/packages/E2ETest/run_wdio.js
index 80cbed2a0dd..1a0bcd1ad1a 100644
--- a/packages/E2ETest/run_wdio.js
+++ b/packages/E2ETest/run_wdio.js
@@ -134,7 +134,7 @@ function printFailedTests(ft) {
 function doProcess(code) {
   const failedTests = parseLogs();
   for (const failedTest of failedTests) {
-    if (Object.keys(failedTest)) {
+    if (Object.keys(failedTest).length > 0) {
       printFailedTests(failedTest);
     }
   }

From 10e75fba5d6b0a6d51a90dc84f71347007191cf9 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Sat, 23 May 2020 03:21:11 -0700
Subject: [PATCH 23/27] clean up e2e app xaml

---
 packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
index 9d361a496be..c857e3dfc95 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
+++ b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml
@@ -8,9 +8,6 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     mc:Ignorable="d"
     Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-    <StackPanel>
-        <TextBlock x:Name="textBlock" Text="TreeDump text goes here" />
-        <react:ReactRootView x:Name="myRootView" ComponentName="ReactUWPTestApp"
-                           Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
-    </StackPanel>
+    <react:ReactRootView x:Name="myRootView" ComponentName="ReactUWPTestApp"
+        Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="500"/>
 </Page>

From ffe4ed832d046a16fbc73ef30a1bfb6b22a49c07 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 26 May 2020 14:57:58 -0700
Subject: [PATCH 24/27] move playground to use ReactApplication

---
 .../windows/ReactUWPTestApp/MainPage.xaml.cs  | 13 ----
 .../playground/windows/playground/App.cpp     | 48 ++-------------
 .../playground/windows/playground/App.xaml    |  7 ++-
 .../windows/playground/MainPage.cpp           | 21 ++-----
 .../playground/windows/playground/MainPage.h  |  2 -
 .../windows/playground/MainPage.xaml          |  4 +-
 .../ReactApplication.cpp                      | 12 ++--
 .../ReactInstanceSettings.h                   | 12 ----
 .../ReactInstanceSettings.idl                 |  1 -
 .../templates/cpp/src/App.cpp                 | 60 ++-----------------
 10 files changed, 25 insertions(+), 155 deletions(-)

diff --git a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
index 38a6fc2a741..d4b0381eefc 100644
--- a/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
+++ b/packages/E2ETest/windows/ReactUWPTestApp/MainPage.xaml.cs
@@ -1,18 +1,5 @@
-using Microsoft.ReactNative;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Runtime.InteropServices.WindowsRuntime;
-using Windows.Foundation;
-using Windows.Foundation.Collections;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
-using Windows.UI.Xaml.Controls.Primitives;
-using Windows.UI.Xaml.Data;
-using Windows.UI.Xaml.Input;
-using Windows.UI.Xaml.Media;
-using Windows.UI.Xaml.Navigation;
 
 // The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
 
diff --git a/packages/playground/windows/playground/App.cpp b/packages/playground/windows/playground/App.cpp
index b06cf5068f7..cd348c0908c 100644
--- a/packages/playground/windows/playground/App.cpp
+++ b/packages/playground/windows/playground/App.cpp
@@ -37,50 +37,10 @@ App::App() {
 /// </summary>
 /// <param name="e">Details about the launch request and process.</param>
 void App::OnLaunched(LaunchActivatedEventArgs const &e) {
-  Frame rootFrame{nullptr};
-  auto content = Window::Current().Content();
-  if (content) {
-    rootFrame = content.try_as<Frame>();
-  }
-
-  // Do not repeat app initialization when the Window already has content,
-  // just ensure that the window is active
-  if (rootFrame == nullptr) {
-    // Create a Frame to act as the navigation context and associate it with
-    // a SuspensionManager key
-    rootFrame = Frame();
-
-    rootFrame.NavigationFailed({this, &App::OnNavigationFailed});
-
-    if (e.PreviousExecutionState() == ApplicationExecutionState::Terminated) {
-      // Restore the saved session state only when appropriate, scheduling the
-      // final launch steps after the restore is complete
-    }
-
-    if (e.PrelaunchActivated() == false) {
-      if (rootFrame.Content() == nullptr) {
-        // When the navigation stack isn't restored navigate to the first page,
-        // configuring the new page by passing required information as a navigation
-        // parameter
-        rootFrame.Navigate(xaml_typename<playground::MainPage>(), box_value(e.Arguments()));
-      }
-      // Place the frame in the current Window
-      Window::Current().Content(rootFrame);
-      // Ensure the current window is active
-      Window::Current().Activate();
-    }
-  } else {
-    if (e.PrelaunchActivated() == false) {
-      if (rootFrame.Content() == nullptr) {
-        // When the navigation stack isn't restored navigate to the first page,
-        // configuring the new page by passing required information as a navigation
-        // parameter
-        rootFrame.Navigate(xaml_typename<playground::MainPage>(), box_value(e.Arguments()));
-      }
-      // Ensure the current window is active
-      Window::Current().Activate();
-    }
-  }
+  Frame frame{};
+  Window::Current().Content(frame);
+  Window::Current().Activate();
+  frame.Navigate(xaml_typename<playground::MainPage>(), box_value(e.Arguments()));
 }
 
 /// <summary>
diff --git a/packages/playground/windows/playground/App.xaml b/packages/playground/windows/playground/App.xaml
index 31d31170016..a74c81723b0 100644
--- a/packages/playground/windows/playground/App.xaml
+++ b/packages/playground/windows/playground/App.xaml
@@ -1,7 +1,8 @@
-<Application
+<react:ReactApplication
     x:Class="playground.App"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:local="using:playground">
+    xmlns:local="using:playground"
+    xmlns:react="using:Microsoft.ReactNative">
 
-</Application>
+</react:ReactApplication>
diff --git a/packages/playground/windows/playground/MainPage.cpp b/packages/playground/windows/playground/MainPage.cpp
index aaade330325..d641caeaf7c 100644
--- a/packages/playground/windows/playground/MainPage.cpp
+++ b/packages/playground/windows/playground/MainPage.cpp
@@ -1,6 +1,7 @@
 #include "pch.h"
 #include "MainPage.h"
 #include "MainPage.g.cpp"
+#include <App.h>
 
 using namespace winrt;
 using namespace Windows::ApplicationModel::Activation;
@@ -35,8 +36,11 @@ void MainPage::OnLoadClick(
   auto host = Host();
   auto bundleFile = unbox_value<hstring>(x_entryPointCombo().SelectedItem().as<ComboBoxItem>().Content());
   host.InstanceSettings().JavaScriptBundleFile(bundleFile);
+
   auto mainComponentName = unbox_value<hstring>(x_rootComponentNameCombo().SelectedItem().as<ComboBoxItem>().Content());
-  host.InstanceSettings().MainComponentName(mainComponentName);
+  ReactRootView().ComponentName(mainComponentName);
+  ReactRootView().ReactNativeHost(host);
+
   host.InstanceSettings().UseWebDebugger(x_UseWebDebuggerCheckBox().IsChecked().GetBoolean());
   host.InstanceSettings().UseDirectDebugger(x_UseDirectDebuggerCheckBox().IsChecked().GetBoolean());
   host.InstanceSettings().DebuggerBreakOnNextLine(x_BreakOnFirstLineCheckBox().IsChecked().GetBoolean());
@@ -48,13 +52,6 @@ void MainPage::OnLoadClick(
 
   // Nudge the ReactNativeHost to create the instance and wrapping context
   host.ReloadInstance();
-
-  m_reactRootView = Microsoft::ReactNative::ReactRootView();
-  m_reactRootView.ComponentName(host.InstanceSettings().MainComponentName());
-  m_reactRootView.ReactNativeHost(host);
-
-  x_rootElement().Children().Clear();
-  x_rootElement().Children().Append(m_reactRootView);
 }
 
 void winrt::playground::implementation::MainPage::x_entryPointCombo_SelectionChanged(
@@ -71,13 +68,7 @@ void winrt::playground::implementation::MainPage::x_entryPointCombo_SelectionCha
 }
 
 Microsoft::ReactNative::ReactNativeHost MainPage::Host() noexcept {
-  if (!m_host) {
-    m_host = Microsoft::ReactNative::ReactNativeHost();
-    m_host.InstanceSettings(InstanceSettings());
-    m_host.PackageProviders(PackageProviders());
-  }
-
-  return m_host;
+  return Application::Current().as<App>()->Host();
 }
 
 Microsoft::ReactNative::ReactInstanceSettings MainPage::InstanceSettings() noexcept {
diff --git a/packages/playground/windows/playground/MainPage.h b/packages/playground/windows/playground/MainPage.h
index cc2d8777abc..32d30dc0b09 100644
--- a/packages/playground/windows/playground/MainPage.h
+++ b/packages/playground/windows/playground/MainPage.h
@@ -13,8 +13,6 @@ struct MainPage : MainPageT<MainPage> {
   Microsoft::ReactNative::ReactInstanceSettings InstanceSettings() noexcept;
   Windows::Foundation::Collections::IVector<Microsoft::ReactNative::IReactPackageProvider> PackageProviders() noexcept;
 
-  Microsoft::ReactNative::ReactRootView m_reactRootView;
-  Microsoft::ReactNative::ReactNativeHost m_host;
   Microsoft::ReactNative::ReactInstanceSettings m_instanceSettings;
   Windows::Foundation::Collections::IVector<Microsoft::ReactNative::IReactPackageProvider> m_packageProviders;
 
diff --git a/packages/playground/windows/playground/MainPage.xaml b/packages/playground/windows/playground/MainPage.xaml
index a4824be9fba..8cb9ede4f50 100644
--- a/packages/playground/windows/playground/MainPage.xaml
+++ b/packages/playground/windows/playground/MainPage.xaml
@@ -4,6 +4,7 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:react="using:Microsoft.ReactNative"
     mc:Ignorable="d">
     <Grid>
         <Grid.RowDefinitions>
@@ -134,8 +135,7 @@
                 InputScope="Number"
                 MaxLength="5" />
         </StackPanel>
-
-        <Grid x:Name="x_rootElement"
+        <react:ReactRootView x:Name="ReactRootView"
             BorderThickness="0,1,0,0"
             BorderBrush="{StaticResource SystemBaseMediumColor}"
             Grid.Row="3"
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.cpp b/vnext/Microsoft.ReactNative/ReactApplication.cpp
index dbddaa5e6c6..fb64898bac6 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.cpp
+++ b/vnext/Microsoft.ReactNative/ReactApplication.cpp
@@ -120,7 +120,6 @@ void ReactApplication::OnActivated(IActivatedEventArgs const &e) {
 
 void ReactApplication::OnLaunched(LaunchActivatedEventArgs const &e) {
   base_type::OnLaunched(e);
-  // auto args = std::wstring(e.Arguments().c_str());
   this->OnCreate(e);
 }
 
@@ -158,11 +157,6 @@ void ApplyArguments(ReactNative::ReactNativeHost const &host, std::wstring const
 /// </summary>
 /// <param name="e">Details about the launch request and process.</param>
 void ReactApplication::OnCreate(IActivatedEventArgs const &e) {
-  // Resuming({this, &ReactApplicationDelegate::OnResuming});
-  // Suspending({this, &ReactApplicationDelegate::OnSuspending});
-  // LeavingBackground({this, &ReactApplicationDelegate::OnLeavingBackground});
-  // EnteredBackground({this, &ReactApplicationDelegate::OnEnteredBackground});
-
 #if defined _DEBUG
   if (IsDebuggerPresent()) {
     this->DebugSettings().EnableFrameRateCounter(TRUE);
@@ -200,13 +194,15 @@ void ReactApplication::OnCreate(IActivatedEventArgs const &e) {
       // Restore the saved session state only when appropriate, scheduling the
       // final launch steps after the restore is complete
     }
+    Window::Current().Content(rootFrame);
   }
-  //
-  //
+
   ApplyArguments(Host(), args.c_str());
 
   // Nudge the ReactNativeHost to create the instance and wrapping context
   Host().ReloadInstance();
+
+  Window::Current().Activate();
 }
 
 /// <summary>
diff --git a/vnext/Microsoft.ReactNative/ReactInstanceSettings.h b/vnext/Microsoft.ReactNative/ReactInstanceSettings.h
index fcdc1ef1a1b..e3f9b12a849 100644
--- a/vnext/Microsoft.ReactNative/ReactInstanceSettings.h
+++ b/vnext/Microsoft.ReactNative/ReactInstanceSettings.h
@@ -28,9 +28,6 @@ struct ReactInstanceSettings : ReactInstanceSettingsT<ReactInstanceSettings> {
 
   IReactNotificationService Notifications() noexcept;
 
-  hstring MainComponentName() noexcept;
-  void MainComponentName(hstring const &value) noexcept;
-
   bool UseDeveloperSupport() noexcept;
   void UseDeveloperSupport(bool value) noexcept;
 
@@ -88,7 +85,6 @@ struct ReactInstanceSettings : ReactInstanceSettingsT<ReactInstanceSettings> {
  private:
   IReactPropertyBag m_properties{ReactPropertyBagHelper::CreatePropertyBag()};
   IReactNotificationService m_notifications{ReactNotificationServiceHelper::CreateNotificationService()};
-  hstring m_mainComponentName{};
   bool m_useDeveloperSupport{REACT_DEFAULT_USE_DEVELOPER_SUPPORT};
   hstring m_javaScriptMainModuleName{};
   hstring m_javaScriptBundleFile{};
@@ -131,14 +127,6 @@ inline IReactNotificationService ReactInstanceSettings::Notifications() noexcept
   return m_notifications;
 }
 
-inline hstring ReactInstanceSettings::MainComponentName() noexcept {
-  return m_mainComponentName;
-}
-
-inline void ReactInstanceSettings::MainComponentName(hstring const &value) noexcept {
-  m_mainComponentName = value;
-}
-
 inline bool ReactInstanceSettings::UseDeveloperSupport() noexcept {
   return m_useDeveloperSupport;
 }
diff --git a/vnext/Microsoft.ReactNative/ReactInstanceSettings.idl b/vnext/Microsoft.ReactNative/ReactInstanceSettings.idl
index ade42eaf090..b050f273e0d 100644
--- a/vnext/Microsoft.ReactNative/ReactInstanceSettings.idl
+++ b/vnext/Microsoft.ReactNative/ReactInstanceSettings.idl
@@ -14,7 +14,6 @@ namespace Microsoft.ReactNative {
 
     IReactPropertyBag Properties { get; };
     IReactNotificationService Notifications { get; };
-    String MainComponentName { get; set; };
     Boolean UseDeveloperSupport { get; set; };
     String JavaScriptMainModuleName { get; set; };
     String JavaScriptBundleFile { get; set; };
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
index 90bcbc30503..ae86c014a75 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
@@ -50,61 +50,11 @@ App::App() noexcept
 /// <param name="e">Details about the launch request and process.</param>
 void App::OnLaunched(LaunchActivatedEventArgs const& e)
 {
-    __super::OnLaunched(e);
+    using super = AppT<App>;
+    super::OnLaunched(e);
 
-    Frame rootFrame{ nullptr };
-    auto content = Window::Current().Content();
-    if (content)
-    {
-        rootFrame = content.try_as<Frame>();
-    }
-
-    // Do not repeat app initialization when the Window already has content,
-    // just ensure that the window is active
-    if (rootFrame == nullptr)
-    {
-        // Create a Frame to act as the navigation context and associate it with
-        // a SuspensionManager key
-        rootFrame = Frame();
-
-        rootFrame.NavigationFailed({ this, &App::OnNavigationFailed });
-
-        if (e.PreviousExecutionState() == ApplicationExecutionState::Terminated)
-        {
-            // Restore the saved session state only when appropriate, scheduling the
-            // final launch steps after the restore is complete
-        }
-
-        if (e.PrelaunchActivated() == false)
-        {
-            if (rootFrame.Content() == nullptr)
-            {
-                // When the navigation stack isn't restored navigate to the first page,
-                // configuring the new page by passing required information as a navigation
-                // parameter
-                rootFrame.Navigate(xaml_typename<<%=name%>::MainPage>(), box_value(e.Arguments()));
-            }
-            // Place the frame in the current Window
-            Window::Current().Content(rootFrame);
-            // Ensure the current window is active
-            Window::Current().Activate();
-        }
-    }
-    else
-    {
-        if (e.PrelaunchActivated() == false)
-        {
-            if (rootFrame.Content() == nullptr)
-            {
-                // When the navigation stack isn't restored navigate to the first page,
-                // configuring the new page by passing required information as a navigation
-                // parameter
-                rootFrame.Navigate(xaml_typename<<%=name%>::MainPage>(), box_value(e.Arguments()));
-            }
-            // Ensure the current window is active
-            Window::Current().Activate();
-        }
-    }
+    Frame rootFrame = Window::Current().Content().as<Frame>();
+    rootFrame.Navigate(xaml_typename<<%=name%>::MainPage>(), box_value(e.Arguments()));
 }
 
 /// <summary>
@@ -127,4 +77,4 @@ void App::OnSuspending([[maybe_unused]] IInspectable const& sender, [[maybe_unus
 void App::OnNavigationFailed(IInspectable const&, NavigationFailedEventArgs const& e)
 {
     throw hresult_error(E_FAIL, hstring(L"Failed to load Page ") + e.SourcePageType().Name);
-}
\ No newline at end of file
+}

From 4f40a5f888e5c3f0dde0a5e9510fdf16877309f2 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 26 May 2020 15:34:38 -0700
Subject: [PATCH 25/27] win32 playground

---
 .../playground/windows/playground-win32/Playground-Win32.cpp  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/playground/windows/playground-win32/Playground-Win32.cpp b/packages/playground/windows/playground-win32/Playground-Win32.cpp
index fa1dfc6f319..240dbdc4504 100644
--- a/packages/playground/windows/playground-win32/Playground-Win32.cpp
+++ b/packages/playground/windows/playground-win32/Playground-Win32.cpp
@@ -129,7 +129,7 @@ struct WindowData {
 
           auto host = Host();
           host.InstanceSettings().JavaScriptBundleFile(m_bundleFile);
-          host.InstanceSettings().MainComponentName(appName);
+
           host.InstanceSettings().UseWebDebugger(m_useWebDebugger);
           host.InstanceSettings().UseDirectDebugger(m_useDirectDebugger);
           host.InstanceSettings().BundleRootPath(
@@ -146,7 +146,7 @@ struct WindowData {
           host.ReloadInstance();
 
           m_reactRootView = winrt::Microsoft::ReactNative::ReactRootView();
-          m_reactRootView.ComponentName(host.InstanceSettings().MainComponentName());
+          m_reactRootView.ComponentName(appName);
           m_reactRootView.ReactNativeHost(host);
 
           // Retrieve ABI pointer from C++/CX pointer

From 5d211385f036d2d93fb77064684e388c3ba23945 Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 26 May 2020 18:51:41 -0700
Subject: [PATCH 26/27] revert sampleApps change since 4982 will fix that, some
 PR feedback

---
 .../windows/SampleAppCPP/SampleAppCpp.vcxproj | 24 ++++---------------
 .../windows/SampleAppCPP/packages.config      |  4 ----
 .../windows/SampleAppCS/App.xaml.cs           |  5 ----
 vnext/local-cli/generator-windows/index.js    |  2 ++
 .../templates/cpp/src/App.cpp                 |  7 +++---
 .../generator-windows/templates/cpp/src/App.h |  4 +++-
 .../templates/cpp/src/MainPage.cpp            |  4 ++--
 .../templates/cs/src/App.xaml.cs              |  5 ----
 8 files changed, 15 insertions(+), 40 deletions(-)

diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj
index d5da23c61f8..f6ed47b6650 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleAppCpp.vcxproj
@@ -1,10 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT License. See LICENSE in the project root for license information. -->
 <Project ToolsVersion="16.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props')" />
-  <Import Project="..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props')" />
-  <Import Project="..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props')" />
-  <Import Project="..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props" Condition="Exists('..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props')" />
   <Import Project="..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props')" />
   <PropertyGroup Label="Globals">
     <CppWinRTOptimized>true</CppWinRTOptimized>
@@ -23,11 +19,11 @@
     <!-- Start Custom .NET Native properties -->
     <DotNetNativeVersion>2.2.7-rel-27913-00</DotNetNativeVersion>
     <!-- The name 'DotNetNativeVersion' is critical for restoring the right .NET framework libraries -->
-    <UWPCoreRuntimeSdkVersion>2.2.10</UWPCoreRuntimeSdkVersion>
+    <UWPCoreRuntimeSdkVersion>2.2.9</UWPCoreRuntimeSdkVersion>
   </PropertyGroup>
   <!-- Start Custom .NET Native targets -->
   <!-- Import all of the .NET Native / CoreCLR props at the beginning of the project -->
-  <!-- <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\Microsoft.Net.UWPCoreRuntimeSdk.props" />
+  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\Microsoft.Net.UWPCoreRuntimeSdk.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props" />
@@ -39,7 +35,7 @@
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary.props" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary.props" />
-  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.props" /> -->
+  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.props" />
   <!-- End Custom .NET Native targets -->
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup>
@@ -216,9 +212,6 @@
   <ImportGroup Label="ExtensionTargets">
     <Import Project="..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets')" />
     <Import Project="..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets')" />
-    <Import Project="..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets" Condition="Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets')" />
-    <Import Project="..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets" Condition="Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets')" />
-    <Import Project="..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets" Condition="Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets')" />
   </ImportGroup>
   <Import Project="$(ReactNativeWindowsDir)\PropertySheets\Bundle.props" />
   <Import Project="$(ReactNativeWindowsDir)\PropertySheets\Bundle.Cpp.targets" />
@@ -229,13 +222,6 @@
     <Error Condition="!Exists('..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.UI.Xaml.2.3.191129002\build\native\Microsoft.UI.Xaml.targets'))" />
     <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.props'))" />
     <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.200316.3\build\native\Microsoft.Windows.CppWinRT.targets'))" />
-    <Error Condition="!Exists('..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
-    <Error Condition="!Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
-    <Error Condition="!Exists('..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets'))" />
-    <Error Condition="!Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
-    <Error Condition="!Exists('..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets'))" />
-    <Error Condition="!Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.props'))" />
-    <Error Condition="!Exists('..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.2.2.10\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets'))" />
   </Target>
   <!-- Start Custom .NET Native targets -->
   <!-- Add a workaround to make sure the .NET framework libraries are correctly copied to the AppX folder in Debug (CoreCLR) mode -->
@@ -249,7 +235,7 @@
     </ItemGroup>
   </Target>
   <!-- Import all of the .NET Native / CoreCLR targets at the end of the project -->
-  <!-- <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
+  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk\$(UWPCoreRuntimeSdkVersion)\build\runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\Microsoft.Net.Native.Compiler\$(DotNetNativeVersion)\build\Microsoft.Net.Native.Compiler.targets" />
@@ -260,6 +246,6 @@
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x86.Microsoft.Net.Native.SharedLibrary.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-x64.Microsoft.Net.Native.SharedLibrary.targets" />
   <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm.Microsoft.Net.Native.SharedLibrary.targets" />
-  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.targets" /> -->
+  <Import Condition="'$(WindowsTargetPlatformMinVersion)' &gt;= '10.0.16299.0'" Project="$(ProgramFiles)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary\$(DotNetNativeVersion)\build\runtime.win10-arm64.Microsoft.Net.Native.SharedLibrary.targets" />
   <!-- End Custom .NET Native targets -->
 </Project>
\ No newline at end of file
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config
index 57aef77374e..f0b88f9827f 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/packages.config
@@ -1,9 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
   <package id="Microsoft.UI.Xaml" version="2.3.191129002" targetFramework="native" />
   <package id="Microsoft.Windows.CppWinRT" version="2.0.200316.3" targetFramework="native" />
-  <package id="runtime.win10-arm.Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
-  <package id="runtime.win10-x64.Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
-  <package id="runtime.win10-x86.Microsoft.Net.UWPCoreRuntimeSdk" version="2.2.10" targetFramework="native" />
 </packages>
\ No newline at end of file
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
index 1f84cdaae2f..25b8d68e74f 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
@@ -54,11 +54,6 @@ protected override void OnLaunched(LaunchActivatedEventArgs e)
         {
             base.OnLaunched(e);
             var frame = Window.Current.Content as Frame;
-            if (frame == null)
-            {
-                frame = new Frame();
-                Window.Current.Content = frame;
-            }
             frame.Navigate(typeof(MainPage));
             Window.Current.Activate();
         }
diff --git a/vnext/local-cli/generator-windows/index.js b/vnext/local-cli/generator-windows/index.js
index f34881758f9..cabb4d312ad 100644
--- a/vnext/local-cli/generator-windows/index.js
+++ b/vnext/local-cli/generator-windows/index.js
@@ -101,6 +101,7 @@ function copyProjectTemplateAndReplace(
   const xamlTargets = `<Import Project="${xamlTargetsPath}" Condition="Exists('${xamlTargetsPath}')" />`;
   const xamlNugetErrors = `<Error Condition="!Exists('${xamlTargetsPath}')" Text="$([System.String]::Format('$(ErrorText)', '${xamlTargetsPath}'))" />`;
   const xamlNamespace = options.useWinUI3 ? 'Microsoft.UI.Xaml' : 'Windows.UI.Xaml';
+  const xamlNamespaceCpp = xamlNamespace.replace('.', '::');
 
   const templateVars = {
     '// clang-format off': '',
@@ -119,6 +120,7 @@ function copyProjectTemplateAndReplace(
     '<%=XamlNugetPkgName%>': xamlNugetPkgName,
     '<%=XamlNugetPkgVersion%>': xamlNugetPkgVersion,
     '<%=XamlNamespace%>': xamlNamespace,
+    '<%=XamlNamespaceCpp%>': xamlNamespaceCpp,
   };
 
   [
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
index ae86c014a75..876e5c6f324 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.cpp
@@ -7,9 +7,9 @@
 using namespace winrt::<%=ns%>;
 using namespace winrt::<%=ns%>::implementation;
 using namespace winrt;
-using namespace Windows::UI::Xaml;
-using namespace Windows::UI::Xaml::Controls;
-using namespace Windows::UI::Xaml::Navigation;
+using namespace <%=XamlNamespaceCpp%>;
+using namespace <%=XamlNamespaceCpp%>::Controls;
+using namespace <%=XamlNamespaceCpp%>::Navigation;
 using namespace Windows::ApplicationModel;
 using namespace Windows::ApplicationModel::Activation;
 
@@ -50,7 +50,6 @@ App::App() noexcept
 /// <param name="e">Details about the launch request and process.</param>
 void App::OnLaunched(LaunchActivatedEventArgs const& e)
 {
-    using super = AppT<App>;
     super::OnLaunched(e);
 
     Frame rootFrame = Window::Current().Content().as<Frame>();
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/App.h b/vnext/local-cli/generator-windows/templates/cpp/src/App.h
index 5795c0feb49..9cf53085880 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/App.h
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/App.h
@@ -10,7 +10,9 @@ namespace winrt::<%=ns%>::implementation
         App() noexcept;
         void OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs const&);
         void OnSuspending(IInspectable const&, Windows::ApplicationModel::SuspendingEventArgs const&);
-        void OnNavigationFailed(IInspectable const&, Windows::UI::Xaml::Navigation::NavigationFailedEventArgs const&);
+        void OnNavigationFailed(IInspectable const&, <%=XamlNamespaceCpp%>::Navigation::NavigationFailedEventArgs const&);
+      private:
+        using super = AppT<App>;
     };
 } // namespace winrt::<%=ns%>::implementation
 
diff --git a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
index de7f7b8e426..9bd90d589d4 100644
--- a/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
+++ b/vnext/local-cli/generator-windows/templates/cpp/src/MainPage.cpp
@@ -9,14 +9,14 @@
 // clang-format off
 
 using namespace winrt;
-using namespace Windows::UI::Xaml;
+using namespace <%=XamlNamespaceCpp%>;
 
 namespace winrt::<%=ns%>::implementation
 {
     MainPage::MainPage()
     {
         InitializeComponent();
-        const auto& app = Application::Current().as<App>();
+        auto app = Application::Current().as<App>();
         ReactRootView().ReactNativeHost(app->Host());
     }
 }
diff --git a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
index f831acc1713..9e62f3d5021 100644
--- a/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
+++ b/vnext/local-cli/generator-windows/templates/cs/src/App.xaml.cs
@@ -42,11 +42,6 @@ protected override void OnLaunched(LaunchActivatedEventArgs e)
         {
             base.OnLaunched(e);
             var frame = Window.Current.Content as Frame;
-            if (frame == null)
-            {
-                frame = new Frame();
-                Window.Current.Content = frame;
-            }
             frame.Navigate(typeof(MainPage));
             Window.Current.Activate();
         }

From 0563111e8e1b1808eaffd852de8a351f661931db Mon Sep 17 00:00:00 2001
From: Alexander Sklar <asklar@microsoft.com>
Date: Tue, 26 May 2020 19:40:30 -0700
Subject: [PATCH 27/27] global replace . for :: for cpp namespaces

---
 vnext/local-cli/generator-windows/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vnext/local-cli/generator-windows/index.js b/vnext/local-cli/generator-windows/index.js
index cabb4d312ad..115255b498a 100644
--- a/vnext/local-cli/generator-windows/index.js
+++ b/vnext/local-cli/generator-windows/index.js
@@ -101,7 +101,7 @@ function copyProjectTemplateAndReplace(
   const xamlTargets = `<Import Project="${xamlTargetsPath}" Condition="Exists('${xamlTargetsPath}')" />`;
   const xamlNugetErrors = `<Error Condition="!Exists('${xamlTargetsPath}')" Text="$([System.String]::Format('$(ErrorText)', '${xamlTargetsPath}'))" />`;
   const xamlNamespace = options.useWinUI3 ? 'Microsoft.UI.Xaml' : 'Windows.UI.Xaml';
-  const xamlNamespaceCpp = xamlNamespace.replace('.', '::');
+  const xamlNamespaceCpp = xamlNamespace.replace(/\./g, '::',);
 
   const templateVars = {
     '// clang-format off': '',