Startup analyzers work for minimal apps

src/Analyzers/Analyzers/src/BuildServiceProviderAnalyzer.cs

@@ -19,7 +19,6 @@ public BuildServiceProviderAnalyzer(StartupAnalysis context)
         public void AnalyzeSymbol(SymbolAnalysisContext context)
         {
             Debug.Assert(context.Symbol.Kind == SymbolKind.NamedType);
-            Debug.Assert(StartupFacts.IsStartupClass(_context.StartupSymbols, (INamedTypeSymbol)context.Symbol));
 
             var type = (INamedTypeSymbol)context.Symbol;
 

src/Analyzers/Analyzers/src/StartupAnalyzer.cs

@@ -5,6 +5,7 @@
 using System.Collections.Immutable;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Operations;
 
 namespace Microsoft.AspNetCore.Analyzers
 {
@@ -35,10 +36,12 @@ private void OnCompilationStart(CompilationStartAnalysisContext context)
                 return;
             }
 
+            var entryPoint = context.Compilation.GetEntryPoint(context.CancellationToken);
+
             context.RegisterSymbolStartAction(context =>
             {
                 var type = (INamedTypeSymbol)context.Symbol;
-                if (!StartupFacts.IsStartupClass(symbols, type))
+                if (!StartupFacts.IsStartupClass(symbols, type) && !SymbolEqualityComparer.Default.Equals(entryPoint?.ContainingType, type))
                 {
                     // Not a startup class, nothing to do.
                     return;
@@ -60,18 +63,28 @@ private void OnCompilationStart(CompilationStartAnalysisContext context)
                     }
 
                     var method = (IMethodSymbol)context.OwningSymbol;
-                    if (StartupFacts.IsConfigureServices(symbols, method))
+                    var isConfigureServices = StartupFacts.IsConfigureServices(symbols, method);
+                    if (isConfigureServices)
                     {
                         OnConfigureServicesMethodFound(method);
+                    }
 
+                    // In the future we can consider looking at more methods, but for now limit to Main, implicit Main, and Configure* methods
+                    var isMain = SymbolEqualityComparer.Default.Equals(entryPoint, context.OwningSymbol);
+
+                    if (isConfigureServices || isMain)
+                    {
                         services.AnalyzeConfigureServices(context);
                         options.AnalyzeConfigureServices(context);
                     }
 
-                    if (StartupFacts.IsConfigure(symbols, method))
+                    var isConfigure = StartupFacts.IsConfigure(symbols, method);
+                    if (isConfigure)
                     {
                         OnConfigureMethodFound(method);
-
+                    }
+                    if (isConfigure || isMain)
+                    {
                         middleware.AnalyzeConfigureMethod(context);
                     }
                 });

src/Analyzers/Analyzers/src/UseAuthorizationAnalyzer.cs

@@ -20,7 +20,6 @@ public UseAuthorizationAnalyzer(StartupAnalysis context)
         public void AnalyzeSymbol(SymbolAnalysisContext context)
         {
             Debug.Assert(context.Symbol.Kind == SymbolKind.NamedType);
-            Debug.Assert(StartupFacts.IsStartupClass(_context.StartupSymbols, (INamedTypeSymbol)context.Symbol));
 
             var type = (INamedTypeSymbol)context.Symbol;
 

src/Analyzers/Analyzers/src/UseMvcAnalyzer.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics;
@@ -19,7 +19,6 @@ public UseMvcAnalyzer(StartupAnalysis context)
         public void AnalyzeSymbol(SymbolAnalysisContext context)
         {
             Debug.Assert(context.Symbol.Kind == SymbolKind.NamedType);
-            Debug.Assert(StartupFacts.IsStartupClass(_context.StartupSymbols, (INamedTypeSymbol)context.Symbol));
 
             var type = (INamedTypeSymbol)context.Symbol;
 

src/Analyzers/Analyzers/test/AnalyzersDiagnosticAnalyzerRunner.cs

@@ -14,9 +14,12 @@ namespace Microsoft.AspNetCore.Analyzers
 {
     internal class AnalyzersDiagnosticAnalyzerRunner : DiagnosticAnalyzerRunner
     {
-        public AnalyzersDiagnosticAnalyzerRunner(DiagnosticAnalyzer analyzer)
+        private readonly OutputKind _outputKind;
+
+        public AnalyzersDiagnosticAnalyzerRunner(DiagnosticAnalyzer analyzer, OutputKind? outputKind = null)
         {
             Analyzer = analyzer;
+            _outputKind = outputKind ?? OutputKind.DynamicallyLinkedLibrary;
         }
 
         public DiagnosticAnalyzer Analyzer { get; }
@@ -51,5 +54,10 @@ public Task<Diagnostic[]> GetDiagnosticsAsync(Project project)
         {
             return GetDiagnosticsAsync(new[] { project }, Analyzer, Array.Empty<string>());
         }
+
+        protected override CompilationOptions ConfigureCompilationOptions(CompilationOptions options)
+        {
+            return options.WithOutputKind(_outputKind);
+        }
     }
 }

src/Analyzers/Analyzers/test/Microsoft.AspNetCore.Analyzers.Test.csproj

@@ -22,6 +22,7 @@
     <Reference Include="Microsoft.AspNetCore.Components.Server" />
     <Reference Include="Microsoft.AspNetCore.Mvc" />
     <Reference Include="Microsoft.AspNetCore.SignalR" />
+    <Reference Include="Microsoft.AspNetCore" />
   </ItemGroup>
 
 </Project>