Mark source generated routes as require dynamic code when RDG is off

Author: AlexMacocian

Net.Sdk.Web.Extensions.SourceGenerators/Constants.cs

@@ -18,6 +18,7 @@ public static class Constants
     public const string Namespace = "Net.Sdk.Web";
     public const string UsingSystemThreading = "System.Threading";
     public const string UsingSystemRuntimeCompilerServices = "System.Runtime.CompilerServices";
+    public const string UsingSystemDiagnosticsCodeAnalysis = "System.Diagnostics.CodeAnalysis";
     public const string UsingMicrosoftAspNetCoreHttp = "Microsoft.AspNetCore.Http";
     public const string UsingMicrosoftAspNetCoreRouting = "Microsoft.AspNetCore.Routing";
     public const string UsingMicrosoftAspNetCoreBuilder = "Microsoft.AspNetCore.Builder";
@@ -120,5 +121,10 @@ public static class Constants
     public const string RequiresAuthorization = "RequireAuthorization";
     public const string WithOpenApiExtension = "WithOpenApi";
 
+    public const string RequiresUnreferencedCode = "RequiresUnreferencedCode";
+    public const string RequiresUnreferencedCodeMessage = "Uses Map methods (reflection-heavy fall-back)";
+    public const string RequiresDynamicCode = "RequiresDynamicCode";
+    public const string RequiresDynamicCodeMessage = "Minimal-API helper needs dynamic code when RDG is off";
+
     public const string Default200Status = "StatusCodes.Status200OK";
 }

Net.Sdk.Web.Extensions.SourceGenerators/Net.Sdk.Web.Extensions.SourceGenerators.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <Version>0.9.4</Version>
+    <Version>0.9.5</Version>
     <LangVersion>latest</LangVersion>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Authors>Alexandru Macocian</Authors>

Net.Sdk.Web.Extensions.SourceGenerators/UseRoutesGenerator.cs

@@ -76,12 +76,13 @@ private static void Execute(Compilation compilation, ImmutableArray<(ClassDeclar
         var languageVersion = maybeLanguageVersion.Value;
         var routeUsings = new HashSet<string>
         {
+            Constants.UsingSystemDiagnosticsCodeAnalysis,
+            Constants.UsingSystemRuntimeCompilerServices,
             Constants.UsingSystemThreading,
-            Constants.UsingMicrosoftAspNetCoreRouting,
-            Constants.UsingMicrosoftAspNetCoreHttp,
             Constants.UsingMicrosoftAspNetCoreBuilder,
+            Constants.UsingMicrosoftAspNetCoreHttp,
             Constants.UsingMicrosoftAspNetCoreMvc,
-            Constants.UsingSystemRuntimeCompilerServices
+            Constants.UsingMicrosoftAspNetCoreRouting
         };
 
         var builder = SyntaxBuilder.CreateCompilationUnit();
@@ -188,6 +189,11 @@ or Constants.DeleteAttributeName
 
         useRoutesWebAppBody.AppendLine("return builder;");
         useRoutesWebAppMethodBuilder.WithBody(useRoutesWebAppBody.ToString());
+        useRoutesWebAppMethodBuilder
+            .WithAttribute(SyntaxBuilder.CreateAttribute(Constants.RequiresUnreferencedCode)
+                    .WithArgument(Constants.RequiresUnreferencedCodeMessage))
+            .WithAttribute(SyntaxBuilder.CreateAttribute(Constants.RequiresDynamicCode)
+                    .WithArgument(Constants.RequiresDynamicCodeMessage));
         foreach (var classUsing in routeUsings)
         {
             builder.WithUsing(classUsing);