1 #include "stdafx.h"
 2 
 3 int __stdcall Add(int a, int b)
 4 {
 5     return a + b;
 6 }
 7 
 8 int __stdcall Sub(int a, int b)
 9 {
10     return a - b;
11 }

1 LIBRARY CreateDLL
2 EXPORTS
3 Add @1,
4 Sub @2,

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using System.Runtime.InteropServices;
 7 
 8 namespace AcmeCollections
 9 {
10     class Program
11     {
12         [DllImport(@"C:\Users\xxxxx\Desktop\study\CreateDLL\Debug\CreateDLL.dll")]//DLL的位置
13         public static extern int Add(int a, int b);
14 
15         [DllImport(@"C:\Users\xxxxx\Desktop\study\CreateDLL\Debug\CreateDLL.dll")]
16         public static extern int Sub(int a, int b);
17         static void Main(string[] args)
18         {
19             long ans;
20             string str;
21             
22             ans = Add(9, 7);
23             str = Convert.ToString(ans);
24             Console.WriteLine(str);
25             ans = Sub(9, 7);
26             str = Convert.ToString(ans);
27             Console.WriteLine(str);
28             Console.ReadLine();
29         }
30     }