Resolve #11727 (#11957)

* Resolve #11727

- Add a BuildServiceProviderValidator for checking startup method 'ConfigureServices(IServiceCollection,..)'

* Fix file name and class name not match

* Resolve conversation:
- helpLink point to 'aka.ms'
- Update DiagnosticDescriptor title
- Update DiagnosticDescriptor messageFormat

src/Mvc/Mvc.Analyzers/src/Startup/BuildServiceProviderValidator.cs

@@ -0,0 +1,41 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Concurrent;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Diagnostics;
+
+namespace Microsoft.AspNetCore.Analyzers
+{
+    internal class BuildServiceProviderValidator : StartupDiagnosticValidator
+    {
+        public static BuildServiceProviderValidator CreateAndInitialize(CompilationAnalysisContext context, ConcurrentBag<StartupComputedAnalysis> analyses)
+        {
+            if (analyses == null)
+            {
+                throw new ArgumentNullException(nameof(analyses));
+            }
+
+            var validator = new BuildServiceProviderValidator();
+
+            foreach (var serviceAnalysis in analyses.OfType<ServicesAnalysis>())
+            {
+                foreach (var serviceItem in serviceAnalysis.Services)
+                {
+                    if (serviceItem.UseMethod.Name == "BuildServiceProvider")
+                    {
+                        context.ReportDiagnostic(Diagnostic.Create(
+                            StartupAnalzyer.BuildServiceProviderShouldNotCalledInConfigureServicesMethod,
+                            serviceItem.Operation.Syntax.GetLocation(),
+                            serviceItem.UseMethod.Name,
+                            serviceAnalysis.ConfigureServicesMethod.Name));
+                    }
+                }
+            }
+
+            return validator;
+        }
+    }
+}

src/Mvc/Mvc.Analyzers/src/Startup/StartupAnalyzer.Diagnostics.cs

@@ -16,5 +16,15 @@ namespace Microsoft.AspNetCore.Analyzers
             DiagnosticSeverity.Warning, 
             isEnabledByDefault: true,
             helpLinkUri: "https://aka.ms/YJggeFn");
+
+        internal readonly static DiagnosticDescriptor BuildServiceProviderShouldNotCalledInConfigureServicesMethod = new DiagnosticDescriptor(
+            "MVC1007",
+            "Do not call 'IServiceCollection.BuildServiceProvider' in 'ConfigureServices'",
+            "Calling 'BuildServiceProvider' from application code results in an additional copy of singleton services being created. Consider alternatives such as dependency injecting services as parameters to 'Configure'.",
+            "Design",
+            DiagnosticSeverity.Warning,
+            isEnabledByDefault: true,
+            helpLinkUri: "https://aka.ms/AA5k895"
+            );
     }
 }

src/Mvc/Mvc.Analyzers/src/Startup/StartupAnalzyer.cs

@@ -27,6 +27,7 @@ namespace Microsoft.AspNetCore.Analyzers
         private readonly static Func<CompilationAnalysisContext, ConcurrentBag<StartupComputedAnalysis>, StartupDiagnosticValidator>[] DiagnosticValidatorFactories = new Func<CompilationAnalysisContext, ConcurrentBag<StartupComputedAnalysis>, StartupDiagnosticValidator>[]
         {
             UseMvcDiagnosticValidator.CreateAndInitialize,
+            BuildServiceProviderValidator.CreateAndInitialize
         };
 
 #pragma warning restore RS1008 // Avoid storing per-compilation data into the fields of a diagnostic analyzer.
@@ -36,6 +37,7 @@ namespace Microsoft.AspNetCore.Analyzers
             SupportedDiagnostics = ImmutableArray.Create<DiagnosticDescriptor>(new[]
             {
                 UnsupportedUseMvcWithEndpointRouting,
+                BuildServiceProviderShouldNotCalledInConfigureServicesMethod
             });
 
             // By default the analyzer will only run for files ending with Startup.cs

src/Mvc/Mvc.Analyzers/test/StartupAnalyzerTest.cs

@@ -68,11 +68,11 @@ namespace Microsoft.AspNetCore.Analyzers
             Assert.Empty(diagnostics);
 
             Assert.Collection(
-                ConfigureServicesMethods.OrderBy(m => m.Name), 
+                ConfigureServicesMethods.OrderBy(m => m.Name),
                 m => Assert.Equal("ConfigureServices", m.Name));
 
             Assert.Collection(
-                ConfigureMethods.OrderBy(m => m.Name), 
+                ConfigureMethods.OrderBy(m => m.Name),
                 m => Assert.Equal("Configure", m.Name),
                 m => Assert.Equal("ConfigureProduction", m.Name));
         }
@@ -209,7 +209,25 @@ namespace Microsoft.AspNetCore.Analyzers
                     AnalyzerAssert.DiagnosticLocation(source.MarkerLocations["MM3"], diagnostic.Location);
                 });
         }
+        [Fact]
+        public async Task StartupAnalyzer_ServicesAnalysis_CallBuildServiceProvider()
+        {
+            // Arrange
+            var source = ReadSource("ConfigureServices_BuildServiceProvider");
 
+            // Act
+            var diagnostics = await Runner.GetDiagnosticsAsync(source.Source);
+
+            // Assert
+            var servicesAnalysis = Assert.Single(Analyses.OfType<ServicesAnalysis>());
+            Assert.NotEmpty(servicesAnalysis.Services);
+            Assert.Collection(diagnostics,
+                diagnostic =>
+                {
+                    Assert.Same(StartupAnalzyer.BuildServiceProviderShouldNotCalledInConfigureServicesMethod, diagnostic.Descriptor);
+                    AnalyzerAssert.DiagnosticLocation(source.MarkerLocations["MM1"], diagnostic.Location);
+                });
+        }
         private TestSource ReadSource(string fileName)
         {
             return MvcTestSource.Read(nameof(StartupAnalyzerTest), fileName);

src/Mvc/Mvc.Analyzers/test/TestFiles/StartupAnalyzerTest/ConfigureServices_BuildServiceProvider.cs

@@ -0,0 +1,20 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Microsoft.AspNetCore.Analyzers.TestFiles.StartupAnalyzerTest
+{
+    public class ConfigureServices_BuildServiceProvider
+    {
+        public void ConfigureServices(IServiceCollection services)
+        {
+            /*MM1*/services.BuildServiceProvider();
+        }
+
+        public void Configure(IApplicationBuilder app)
+        {
+        }
+    }
+}