1、先看一个委托的例子
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 namespace DeleGate
7 {
8 public delegate void GreetingDelegate(string name);//委托
9
10 class Program
11 {
12 private static void EnglishGreeting(string name)
13 {
14 Console.WriteLine("Morning," + name);
15 }
16 private static void ChineseGreeting(string name)
17 {
18 Console.WriteLine("早上好," + name);
19 }
20
21 static void Main(string[] args)
22 {
23 GreetingDelegate MakeGreeting1 = new GreetingDelegate(EnglishGreeting);//实例化
24 GreetingDelegate MakeGreeting2 = new GreetingDelegate(ChineseGreeting);
25 MakeGreeting1("Huang huang");
26 MakeGreeting2("黄 皇");
27
28 }
29 }
30 }
解析:
2、定义一个委托,其签名与EnglishGreeting和ChineseGreeting的签名相匹配;
public delegate void GreetingDelegate(string name);//委托
private static void EnglishGreeting(string name)
private static void ChineseGreeting(string name)
3、用new关键字(将方法名作为参数)生成一个委托对象,建立委托与方法的关联;
如:
GreetingDelegate MakeGreeting1 = new GreetingDelegate(EnglishGreeting);//实例化
GreetingDelegate MakeGreeting2 = new GreetingDelegate(ChineseGreeting);
注意:参数使用函数名,且不带括号。
4、把一个函数引用赋给委托变量,这种语法有点古怪,不好记。
参考:http://www.cnblogs.com/cntour365/archive/2008/08/29/1279757.html