怎么调用DLL中参数带函数指针的函数

如何调用DLL中参数带函数指针的函数？
请较！

[解决办法]
using System;
using System.Runtime.InteropServices;

public delegate bool CallBack(int hwnd, int lParam);

public class EnumReportApp {

[DllImport( "user32 ")]
public static extern int EnumWindows(CallBack x, int y);

public static void Main()
{
CallBack myCallBack = new CallBack(EnumReportApp.Report);
EnumWindows(myCallBack, 0);
}

public static bool Report(int hwnd, int lParam) {
Console.Write( "Window handle is ");
Console.WriteLine(hwnd);
return true;
}
}