本文通过一个具体的 C# 代码示例介绍了如何定义和使用委托。该示例展示了如何创建一个委托类型，将其绑定到方法，并通过调用委托来触发相应的事件。
1
using System;
2
3namespace DelegateSample
4
{
5
public delegate void PrintCallback(int number);
6
7
public class Printer{
8
9 //委托定义
10 private PrintCallback _print;
11
12 //委托将要依附的属性
13 public PrintCallback PrintCallback{
14 get{return _print;}
15 set{_print=value;}
16
}
17 }
18
19 public class Driver{
20
21 //将要委托的事件
22 private void PrintInteger(int number){
23 Console.WriteLine("From PrintInteger:The number is {0}.", number);
24 }
25
26 static void Main(string[] args){
27 Driver driver = new Driver();
28 Printer printer=new Printer();
29
30 //将委托绑定到属性
31 printer.PrintCallback = new PrintCallback(driver.PrintInteger);
32
33 //使用属性触发委托事件
34 printer.PrintCallback(10);
35 printer.PrintCallback(100);
36
37 Console.WriteLine("press Enter to exit");
38 Console.ReadLine();
39 }
40 }
41
42
}
43
44结果：
45From PrintInteger:The number is 10.
46From PrintInteger:The number is 100.
47press Enter to exit
48
49
using System;2
3
namespace DelegateSample4
{5
public delegate void PrintCallback(int number);6
7
public class Printer{8
9
//委托定义10
private PrintCallback _print;11
12
//委托将要依附的属性13
public PrintCallback PrintCallback{14
get{return _print;}15
set{_print=value;}16
}17
}18
19
public class Driver{20
21
//将要委托的事件22
private void PrintInteger(int number){23
Console.WriteLine("From PrintInteger:The number is {0}.", number);24
}25
26
static void Main(string[] args){27
Driver driver = new Driver();28
Printer printer=new Printer();29
30
//将委托绑定到属性31
printer.PrintCallback = new PrintCallback(driver.PrintInteger);32
33
//使用属性触发委托事件34
printer.PrintCallback(10);35
printer.PrintCallback(100);36
37
Console.WriteLine("press Enter to exit");38
Console.ReadLine();39
}40
}41
42
}43
44
结果：45
From PrintInteger:The number is 10.46
From PrintInteger:The number is 100.47
press Enter to exit48
49
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