Pointer to function for unmanaged code in C#

I have a dll which accepts a struct that contains a pointer to a function to do a callback.

How can I get an IntPtr to a function of my application to build the 开发者_如何学Cstruct?

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public class OPERATION {
        public uint OperationID;
        public IntPtr Context;  
        public IntPtr Callback; -> How to pass this?
    }

Here is the delegate accepting the OPERATION struct

public delegate void MY_CALLBACK([In] OPERATION operation, [In] uint msgId, [In] IntPtr msgDataPtr);

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use Marshal.GetFunctionPointerForDelegate

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Maybe the Marshal.GetFunctionPointerForDelegate method may help you.