Trim Microsoft.AspNetCore (#42555)

Author: JamesNK

eng/TrimmableProjects.props

@@ -7,6 +7,7 @@
 -->
 <Project>
   <ItemGroup>
+    <TrimmableProject Include="Microsoft.AspNetCore" />
     <TrimmableProject Include="Microsoft.AspNetCore.DataProtection.Abstractions" />
     <TrimmableProject Include="Microsoft.AspNetCore.Cryptography.Internal" />
     <TrimmableProject Include="Microsoft.AspNetCore.Cryptography.KeyDerivation" />

src/DefaultBuilder/src/ConfigureWebHostBuilder.cs

@@ -173,7 +173,7 @@ IWebHostBuilder ISupportsStartup.Configure(Action<WebHostBuilderContext, IApplic
         throw new NotSupportedException("Configure() is not supported by WebApplicationBuilder.WebHost. Use the WebApplication returned by WebApplicationBuilder.Build() instead.");
     }
 
-    IWebHostBuilder ISupportsStartup.UseStartup(Type startupType)
+    IWebHostBuilder ISupportsStartup.UseStartup([DynamicallyAccessedMembers(StartupLinkerOptions.Accessibility)] Type startupType)
     {
         throw new NotSupportedException("UseStartup() is not supported by WebApplicationBuilder.WebHost. Use the WebApplication returned by WebApplicationBuilder.Build() instead.");
     }

src/DefaultBuilder/src/Microsoft.AspNetCore.csproj

@@ -7,7 +7,7 @@
     <Description>Microsoft.AspNetCore</Description>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <IsPackable>false</IsPackable>
-    <Nullable>enable</Nullable>
+    <IsTrimmable>true</IsTrimmable>
   </PropertyGroup>
 
   <ItemGroup>

src/DefaultBuilder/src/StartupLinkerOptions.cs

@@ -0,0 +1,12 @@
+// 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.CodeAnalysis;
+
+namespace Microsoft.AspNetCore;
+
+internal static class StartupLinkerOptions
+{
+    // We're going to keep all public constructors and public methods on Startup classes
+    public const DynamicallyAccessedMemberTypes Accessibility = DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.PublicMethods;
+}

src/DefaultBuilder/src/WebHost.cs

@@ -1,6 +1,7 @@
 // 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.CodeAnalysis;
 using System.Reflection;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.HostFiltering;
@@ -269,6 +270,6 @@ internal static void ConfigureWebDefaults(IWebHostBuilder builder)
     /// <typeparam name ="TStartup">The type containing the startup methods for the application.</typeparam>
     /// <param name="args">The command line args.</param>
     /// <returns>The initialized <see cref="IWebHostBuilder"/>.</returns>
-    public static IWebHostBuilder CreateDefaultBuilder<TStartup>(string[] args) where TStartup : class =>
+    public static IWebHostBuilder CreateDefaultBuilder<[DynamicallyAccessedMembers(StartupLinkerOptions.Accessibility)] TStartup>(string[] args) where TStartup : class =>
         CreateDefaultBuilder(args).UseStartup<TStartup>();
 }

src/Tools/Tools.slnf

@@ -5,6 +5,7 @@
       "src\\Antiforgery\\src\\Microsoft.AspNetCore.Antiforgery.csproj",
       "src\\Components\\Authorization\\src\\Microsoft.AspNetCore.Components.Authorization.csproj",
       "src\\Components\\Components\\src\\Microsoft.AspNetCore.Components.csproj",
+      "src\\Components\\CustomElements\\src\\Microsoft.AspNetCore.Components.CustomElements.csproj",
       "src\\Components\\Forms\\src\\Microsoft.AspNetCore.Components.Forms.csproj",
       "src\\Components\\WebAssembly\\Authentication.Msal\\src\\Microsoft.Authentication.WebAssembly.Msal.csproj",
       "src\\Components\\WebAssembly\\JSInterop\\src\\Microsoft.JSInterop.WebAssembly.csproj",
@@ -18,6 +19,7 @@
       "src\\DataProtection\\EntityFrameworkCore\\src\\Microsoft.AspNetCore.DataProtection.EntityFrameworkCore.csproj",
       "src\\DataProtection\\Extensions\\src\\Microsoft.AspNetCore.DataProtection.Extensions.csproj",
       "src\\DataProtection\\StackExchangeRedis\\src\\Microsoft.AspNetCore.DataProtection.StackExchangeRedis.csproj",
+      "src\\DefaultBuilder\\src\\Microsoft.AspNetCore.csproj",
       "src\\Extensions\\Features\\src\\Microsoft.Extensions.Features.csproj",
       "src\\HealthChecks\\Abstractions\\src\\Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj",
       "src\\HealthChecks\\HealthChecks\\src\\Microsoft.Extensions.Diagnostics.HealthChecks.csproj",
@@ -52,6 +54,7 @@
       "src\\Middleware\\Localization.Routing\\src\\Microsoft.AspNetCore.Localization.Routing.csproj",
       "src\\Middleware\\Localization\\src\\Microsoft.AspNetCore.Localization.csproj",
       "src\\Middleware\\MiddlewareAnalysis\\src\\Microsoft.AspNetCore.MiddlewareAnalysis.csproj",
+      "src\\Middleware\\OutputCaching\\src\\Microsoft.AspNetCore.OutputCaching.csproj",
       "src\\Middleware\\RateLimiting\\src\\Microsoft.AspNetCore.RateLimiting.csproj",
       "src\\Middleware\\RequestDecompression\\src\\Microsoft.AspNetCore.RequestDecompression.csproj",
       "src\\Middleware\\ResponseCaching.Abstractions\\src\\Microsoft.AspNetCore.ResponseCaching.Abstractions.csproj",