From f6b27018d4b9bd8323abdf16f246374286ed5456 Mon Sep 17 00:00:00 2001
From: Larry Ewing <lewing@microsoft.com>
Date: Wed, 1 Apr 2026 08:57:15 -0500
Subject: [PATCH 1/2] Copy HotReload dll to intermediate to avoid duplicate
 identity

The JS module was already copied to $(IntermediateOutputPath)hotreload/
to give each project a unique path (sdk#52816), but the dll was still
referenced directly from the shared SDK path. In multi-client hosted
Blazor WASM scenarios, both clients reference the same SDK-path dll,
which causes ComputeWasmPublishAssets to replace Framework-materialized
per-project assets with the shared path, leading to duplicate Identity
crashes in ApplyCompressionNegotiation.

Copy the dll to intermediate (matching the .js pattern) so each project
gets a unique path. This is the same approach @javiercn recommended for
the JS module in sdk#52816.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 src/WasmSdk/Sdk/Sdk.targets | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/WasmSdk/Sdk/Sdk.targets b/src/WasmSdk/Sdk/Sdk.targets
index 35a16622a0cf..f09e0defdb5c 100644
--- a/src/WasmSdk/Sdk/Sdk.targets
+++ b/src/WasmSdk/Sdk/Sdk.targets
@@ -28,15 +28,20 @@ Copyright (c) .NET Foundation. All rights reserved.
       <_WasmHotReloadIntermediatePath>$(IntermediateOutputPath)hotreload\</_WasmHotReloadIntermediatePath>
     </PropertyGroup>
 
-    <!-- Copy the JS module to intermediate folder to avoid duplicate identity when multiple projects reference the same SDK file -->
+    <!-- Copy the JS module and DLL to intermediate folder to avoid duplicate identity when multiple projects reference the same SDK file -->
     <Copy
       SourceFiles="$(_WasmHotReloadPath)Microsoft.DotNet.HotReload.WebAssembly.Browser.lib.module.js"
       DestinationFolder="$(_WasmHotReloadIntermediatePath)"
       SkipUnchangedFiles="true"
       Condition="'$(_WasmHotReloadPath)' != ''" />
+    <Copy
+      SourceFiles="$(_WasmHotReloadPath)Microsoft.DotNet.HotReload.WebAssembly.Browser.dll"
+      DestinationFolder="$(_WasmHotReloadIntermediatePath)"
+      SkipUnchangedFiles="true"
+      Condition="'$(_WasmHotReloadPath)' != ''" />
 
     <ItemGroup Condition="'$(_WasmHotReloadPath)' != ''">
-      <ReferenceCopyLocalPaths Include="$(_WasmHotReloadPath)Microsoft.DotNet.HotReload.WebAssembly.Browser.dll">
+      <ReferenceCopyLocalPaths Include="$(_WasmHotReloadIntermediatePath)Microsoft.DotNet.HotReload.WebAssembly.Browser.dll">
         <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         <CopyToPublishDirectory>Never</CopyToPublishDirectory>
       </ReferenceCopyLocalPaths>

From 81387984d1a12635da8d3ad51a978c8abe3960fb Mon Sep 17 00:00:00 2001
From: Larry Ewing <lewing@microsoft.com>
Date: Wed, 1 Apr 2026 09:40:14 -0500
Subject: [PATCH 2/2] Add FileWrites entry for copied HotReload dll

Ensures dotnet clean removes the intermediate copy.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 src/WasmSdk/Sdk/Sdk.targets | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/WasmSdk/Sdk/Sdk.targets b/src/WasmSdk/Sdk/Sdk.targets
index f09e0defdb5c..1a6af3ca1bf5 100644
--- a/src/WasmSdk/Sdk/Sdk.targets
+++ b/src/WasmSdk/Sdk/Sdk.targets
@@ -52,6 +52,7 @@ Copyright (c) .NET Foundation. All rights reserved.
         <OriginalItemSpec>%(Identity)</OriginalItemSpec>
       </_WasmHotReloadModule>
       <FileWrites Include="$(_WasmHotReloadIntermediatePath)Microsoft.DotNet.HotReload.WebAssembly.Browser.lib.module.js" />
+      <FileWrites Include="$(_WasmHotReloadIntermediatePath)Microsoft.DotNet.HotReload.WebAssembly.Browser.dll" />
     </ItemGroup>
 
     <DefineStaticWebAssets