It is illegal to reflect on the custom attributes of a Type loaded via ReflectionOnlyGetType

Environment

• Pythonnet version: 2.5.1
• Python version: 3.8 (anaconda)
• Operating System: Windows 10

Details

• Describe what you were trying to get done.

  View C# object members in jupyter notebook (via dot tab). C# app crashes.

• What commands did you run to trigger this issue?

    csharpObjectWithCustomAttributes.  # +tab in jupyter notebook should list members, but instead crashes

The c# library I am using is not publicly available. I assume it could be reproduced with some effort (creating an example C# library having an object with custom attributes).

However, I have found a related stack overflow issue (and solution): https://stackoverflow.com/a/42540881

And I see the potential "illegal use" in the code base here: https://github.com/pythonnet/pythonnet/search?q=GetCustomAttributes&unscoped_q=GetCustomAttributes

The fix might be to convert calls to GetCustomAttributes to what is mentioned in the stack overflow answer.

• If there was a crash, please include the traceback here.

Traceback happens inside loaded DLL and application crashes. All I get is this:

TBH, that is one of the best error messages I've seen in a long time.

Start with the repository search for GetCustomAttributes and compare those calls with the linked Stack Overflow solution. Reproduce the Jupyter notebook member-listing crash using a C# object with custom attributes; done means reflection no longer crashes when inspecting the object.