Why Marshal's GetDelegateForFunctionPointer does not accept generic type delegates such as Func<int, int>?

Question

It generates ArgumentException "The specified Type must not be a generic type definition.
Parameter name: t"

What is the reason for this to be?

Answer 1

Hi,
Actually, Generics are not supported in interop scenarios, the GetDelegateForFunctionPointer method is also involved in.
See more from following links:
http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.getdelegateforfunctionpointer.aspx

Thanks,
Eric

---

Please remember to mark helpful replies as answers and unmark them if they provide no help.

Answer 2

The question is what is the reason of this restriction?

Answer 3

Hi,
This restriction is caused by some technical difficulities, and the product team will do their best to improve it in future releases.
Currently, as it is documented, we’d better avoid using generics in that method.

Thanks,
Eric

---

Please remember to mark helpful replies as answers and unmark them if they provide no help.