Implement analyzer that suggests using builder.Services to ConfigureServices method

src/Framework/AspNetCoreAnalyzers/src/Analyzers/DiagnosticDescriptors.cs

@@ -89,6 +89,15 @@ internal static class DiagnosticDescriptors
         isEnabledByDefault: true,
         helpLinkUri: "https://aka.ms/aspnet/analyzers");
 
+    internal static readonly DiagnosticDescriptor DoNotUseHostConfigureServices = new(
+        "ASP0012",
+        "Suggest using builder.Services over Host.ConfigureServices or WebHost.ConfigureServices",
+        "Suggest using builder.Services instead of {0}",
+        "Usage",
+        DiagnosticSeverity.Warning,
+        isEnabledByDefault: true,
+        helpLinkUri: "https://aka.ms/aspnet/analyzers");
+
     internal static readonly DiagnosticDescriptor DisallowConfigureAppConfigureHostBuilder = new(
         "ASP0013",
         "Suggest using WebApplicationBuilder.Configuration over Configure methods",

src/Framework/AspNetCoreAnalyzers/src/Analyzers/WebApplicationBuilder/WebApplicationBuilderAnalyzer.cs

@@ -22,6 +22,7 @@ public class WebApplicationBuilderAnalyzer : DiagnosticAnalyzer
         DiagnosticDescriptors.DoNotUseConfigureWithConfigureWebHostBuilder,
         DiagnosticDescriptors.DoNotUseUseStartupWithConfigureWebHostBuilder,
         DiagnosticDescriptors.DoNotUseHostConfigureLogging,
+        DiagnosticDescriptors.DoNotUseHostConfigureServices,
         DiagnosticDescriptors.DisallowConfigureAppConfigureHostBuilder
     });
 
@@ -51,6 +52,11 @@ public override void Initialize(AnalysisContext context)
                 wellKnownTypes.HostingHostBuilderExtensions,
                 wellKnownTypes.WebHostBuilderExtensions
             };
+            INamedTypeSymbol[] configureServicesTypes =
+            {
+                wellKnownTypes.HostingHostBuilderExtensions,
+                wellKnownTypes.ConfigureWebHostBuilder
+            };
             INamedTypeSymbol[] configureAppTypes =
             {
                 wellKnownTypes.ConfigureHostBuilder,
@@ -145,6 +151,38 @@ public override void Initialize(AnalysisContext context)
                             invocation));
                 }
 
+                // var builder = WebApplication.CreateBuilder(args);
+                // builder.Host.ConfigureServices(x => {});
+                if (IsDisallowedMethod(
+                        operationAnalysisContext,
+                        invocation,
+                        targetMethod,
+                        wellKnownTypes.ConfigureHostBuilder,
+                        "ConfigureServices",
+                        configureServicesTypes))
+                {
+                    operationAnalysisContext.ReportDiagnostic(
+                        CreateDiagnostic(
+                            DiagnosticDescriptors.DoNotUseHostConfigureServices,
+                            invocation));
+                }
+
+                // var builder = WebApplication.CreateBuilder(args);
+                // builder.WebHost.ConfigureServices(x => {});
+                if (IsDisallowedMethod(
+                        operationAnalysisContext,
+                        invocation,
+                        targetMethod,
+                        wellKnownTypes.ConfigureWebHostBuilder,
+                        "ConfigureServices",
+                        configureServicesTypes))
+                {
+                    operationAnalysisContext.ReportDiagnostic(
+                        CreateDiagnostic(
+                            DiagnosticDescriptors.DoNotUseHostConfigureServices,
+                            invocation));
+                }
+
                 // var builder = WebApplication.CreateBuilder();
                 // builder.WebHost.ConfigureAppConfiguration(builder => {});
                 if (IsDisallowedMethod(