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Type.GetType with assembly resolver and null type resolver can throw nullreferenceexception #21616

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khaledmousa opened this issue Feb 5, 2023 · 0 comments · May be fixed by #21617
Open

Type.GetType with assembly resolver and null type resolver can throw nullreferenceexception #21616

khaledmousa opened this issue Feb 5, 2023 · 0 comments · May be fixed by #21617

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@khaledmousa
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Steps to Reproduce

  1. Create a new Xamarin.Forms project targeting Android (used Xamarin.Forms 5.0.0.2196)
  2. Execute the following statement: var t = Type.GetType(typeof(string).Name, (a) => null, null, false); at the beginning of the MainActivity.OnCreate method
  3. Run the project

Current Behavior

Statement throws a NullReferenceException

Expected Behavior

No exception is thrown, and the call to Type.GetType returns null (this behavior is confirmed on .Net 4.7.2)

Stacktrace

Exception looks to be caused by a missing null check on asm in TypeSpec.cs

Contrast this with the dotnet/runtime version
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Missing null check in TypeSpec.Resolve when asm is null and typeResol… khaledmousa/mono
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@khaledmousa