将《C# 调用非托管程序》一文中最后一种方法修改如下(篇幅原因简化了注释)：

/*修改记录
2008-5-11 8:07 曲滨
>> 基本实现预期功能
[!] 明天进行优化

2008-5-12 15:54 曲滨
[E] 优化完成
[N] 加入 NativeCodeHelper 类便于使用

2010-6-17 周振兴
修改兼容性，可在开启DEP及Vista/Win7中运行。
*/

namespace NShellNativeCode
{
using System;
using System.Runtime.InteropServices;

delegate int AddProc(int p1, int p2);
class Program
{
static void Main(string[] args)
{
byte[] codeBytes = {
0x8B, 0x44, 0x24, 0x08 // mov eax,[esp+08h]
, 0x8B, 0x4C, 0x24, 0x04 // mov ecx,[esp+04h]
, 0x03, 0xC1 // add eax,ecx
, 0xC3 // ret
};

/*
上面的字节数组，就是下面函数的本机代码；
int add(int x,int y) {
return x+y;
}

*/

IntPtr handle = IntPtr.Zero;
handle =VirtualAlloc(
IntPtr.Zero,
codeBytes.Length,
MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);

try
{

Marshal.Copy(codeBytes, 0, handle, codeBytes.Length);

AddProc add
= Marshal.GetDelegateForFunctionPointer(handle, typeof(AddProc)) as AddProc;

int r = add(1976, 1);

Console.WriteLine("本机代码返回:{0}", r);


}
finally
{
VirtualFree(handle, 0, MEM_RELEASE);
}

Console.ReadLine();
}

//Windows API
[DllImport("Kernel32.dll", EntryPoint = "VirtualAlloc")]
public static extern IntPtr VirtualAlloc(IntPtr address, int size, uint allocType, uint protect);

[DllImport("Kernel32.dll", EntryPoint = "VirtualFree")]
public static extern bool VirtualFree(IntPtr address, int size, uint freeType);

//flags
const uint MEM_COMMIT = 0x1000;
const uint MEM_RESERVE = 0x2000;

const uint PAGE_EXECUTE_READWRITE = 0x40;

const uint MEM_RELEASE = 0x8000;
}
}