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Well, I solved it this way:
First downloaded the project from dll "mscorlib" in the following link =
https://referencesource.microsoft.com/#mscorlib/system/Runtime/interopservices/gchandle.Cs
Then where it is written in the image of the question "Find and find gchandle.Cs" I clicked and went directly to the project download folder and referenced the class.
It worked that way for me, but I still haven’t identified what happened to generate the problem.
You fixed the problem in Visual Studio or what caused the error in your application?
– Maniero
Which caused the error. Apparently my Visual Studio is not correctly referencing the mscorlib dll. I’m having to manually reference.
– Arthur Mapa
I find it difficult that the visual studio is not finding mscorlib, it would be the case to reinstall, this request from the source of mscorlib.dll not because you are trying to debug a method from the Gchandle class ??
– Leandro Angelo