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Add note about internal representation of .NET runtime types #44672

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Feb 4, 2025
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Add note about internal representation of .NET runtime types #44672

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2 changes: 2 additions & 0 deletions docs/standard/native-interop/best-practices.md
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Expand Up @@ -400,6 +400,8 @@ Pointers to structs in definitions must either be passed by `ref` or use `unsafe

✔️ DO use the C# `sizeof()` instead of `Marshal.SizeOf<MyStruct>()` for blittable structures to improve performance.

❌ DON'T depend on internal representation of struct types exposed by .NET runtime libraries unless it is explicitly documented.

❌ AVOID using classes to express complex native types through inheritance.

❌ AVOID using `System.Delegate` or `System.MulticastDelegate` fields to represent function pointer fields in structures.
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