Defining a delegate as a function pointer

Question

I am using a delegate which calls an unmanaged function pointer. This causes the Garbage Collector to collect it before it is used, as described in the CallbackOnCollectedDe

Answer 1

You didn't read it correctly. You must do this:

...change your code to keep a reference to that delegate on the managed side for the lifetime of the marshaled unmanaged function pointer.

In other words, just store a reference to the delegate instance in your class and make sure the class object survives long enough. Use a static if you really have to.