Can you use .net 3.5 Action or Func as Marshalled unmanaged delegates?

Question

After reading Dynamically calling unmanaged dlls in .net

I've been trying to modify the code to my liking. I made a class that implements idisposable to wrap load calls in and free them when needed. However I can't seem to figure out the syntax if it is possible to use anonymous delegates with it.

var loaded=DynamicLibraryLoader.TryLoad("User32.dll");
var beeper=loaded.GetProcAddress("MessageBeep");
var type=typeof(Action<UInt32>);
Action<UInt32> beepAction2=(Action<UInt32>) Marshal.GetDelegateForFunctionPointer(beeper,type);

The last line throws an argument exception saying that the specified Type must not be a generic type definition. Is there a way around this or do I have to provide a named delegate to do anything unmanaged?

For reference of any interested in what you can do by default in windows with unmanaged code - Link (create shortcuts,dynamically load a DLL)

Answer 1

As the exception indicates, you must use a non-generic delegate when converting a native function pointer to managed code.