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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