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Tag: trimming

5 posts

2026-07-29 errors csharp dotnet

Fix: Reflection-based serialization has been disabled for this application

This InvalidOperationException means PublishTrimmed or PublishAot flipped JsonSerializerIsReflectionEnabledByDefault to false. Fix it with a source-generated JsonSerializerContext.

2026-07-09 dotnet trimming native-aot

What is trim-safe code and how do I write it?

Trim-safe code is code the .NET trimmer can statically prove is reachable, so it survives when unused code is removed from a self-contained app. This is the practical guide: turn on the analyzer, drive every IL2xxx warning to zero, annotate reflection with DynamicallyAccessedMembers, propagate RequiresUnreferencedCode to public APIs, and replace unanalyzable patterns with source generators.

2026-06-20 dotnet trimming native-aot

What is the DynamicallyAccessedMembers attribute?

DynamicallyAccessedMembers tells the .NET trimmer and AOT compiler which members of a Type you reach by reflection, so they are kept instead of trimmed away. It turns a silent runtime MissingMethodException into a build-time IL2070 warning. Here is what the attribute does, how the data-flow analysis behind it works, and how to annotate parameters, fields, and generic type parameters correctly.

2026-05-12 errors csharp dotnet

Fix: System.IO.FileNotFoundException: Could not load file or assembly in a published app

Runs fine with dotnet run, throws after dotnet publish. The DLL is usually missing from the publish folder, not the runtime. Check deps.json, ProjectReference Private, and trimming.

2026-05-10 errors csharp dotnet

Fix: PlatformNotSupportedException: Operation is not supported on this platform in Native AOT

Native AOT strips the JIT and the interpreter, so reflection emit, expression-tree compilation, and unseen MakeGenericType throw at runtime. Find the call via IL3050 and replace it with a source generator or a pre-baked path.