1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace 回调函数自己写的
 7 {
 8     public delegate string ProcessDelegate(int s1, int s2);
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             string str1 = Process(2, 1, new ProcessDelegate(Add));
14             string str2 = Process(2, 1, new ProcessDelegate(Sub));
15 
16             Console.WriteLine(str1 + Environment.NewLine + str2);
17             Console.Read();
18         }
19         public static string Process(int i1, int i2, ProcessDelegate process)
20         {
21             return process(i1, i2);
22         }
23         public static string Add(int i1, int i2)
24         {
25             return (i1 + i2).ToString();
26         }
27         public static string Sub(int i1, int i2)
28         {
29             return (i1 - i2).ToString();
30         }
31     }
32 }