Marshaling Delegates as Function Pointers 

The following table shows examples of how a managed delegate can be marshaled to a function pointer in unmanaged code.

Managed delegate (C#)	Unmanaged function pointer (C++)
public delegate int EnumDelegate( IntPtr hwnd, int LParam); [DllImport("coredll.dll")] static extern int EnumWindows( EnumDelegate d, Int lParm);	typedef BOOL (* WNDENUMPROC) (HWND, LPARAM); BOOL EnumWindows( WNDENUMPROC lpEnumFunc, LPARAM lParam);
public delegate int EnumDelegate( IntPtr hwnd, int lParam); [DllImport("coredll.dll")] static extern int EnumWindows( [MarshalAs(UnmanagedType.FunctionPtr0] EnumDelegate d, Int lParam);	typedef BOOL (* WNDENUMPROC) (HWND, LPARAM); BOOL EnumWindows( WNDENUMPROC lpENumFunc, LPARAM lParam);

See Also

Other Resources

Marshaling Support