示例1:
代碼
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
delegate void EatDelegate(String food);
class Program
{
private static void zsEat(String food)
{
Console.WriteLine("張三吃"+food);
}
private static void lsEat(String food)
Console.WriteLine("李四吃"+food);
private static void wwEat(String food)
Console.WriteLine("王五吃"+food);
static void Main(string[] args)
/*定義張三,李四,王五吃food的委托,
* 并為他們的委托代理他們吃food的方法.*/
EatDelegate zs = new EatDelegate(zsEat);
EatDelegate ls = new EatDelegate(lsEat);
EatDelegate ww = new EatDelegate(wwEat);
//委托鍊
EatDelegate eatChain = zs + ls + ww;
Console.WriteLine("張三,李四,王五開座談會.");
//調用委托鍊
eatChain("吃西瓜");
Console.WriteLine("李四出去接電話.");
/*C#在委托中重載了+=和-=操作符,
* 使它們能夠對委托鍊進行+,-操作*/
eatChain -= ls;
eatChain("吃香蕉");
Console.WriteLine("李四回來了.");
eatChain += ls;
eatChain("吃桔子.");
}
}
委托的匿名方法:
EatDelegate eatChain=null;
//C#2.0增加的委托的匿名方法
eatChain += delegate(String food) { Console.WriteLine("張三吃"+food); };
eatChain += delegate(String food) { Console.WriteLine("李四吃"+food); };
eatChain += delegate(String food) { Console.WriteLine("王五吃" + food); };
eatChain("西瓜");
委托代理執行個體方法
class Man
private string name;
public Man(string name)
this.name = name;
public void Eat(string food)
Console.WriteLine(name+"吃"+food);
/*委托代理執行個體方法*/
class Party
[STAThread]
Man zsObj = new Man("張三");
Man lsObj = new Man("李四");
Man wwObj = new Man("王五");
EatDelegate zs = new EatDelegate(zsObj.Eat);
EatDelegate ls = new EatDelegate(lsObj.Eat);
EatDelegate ww = new EatDelegate(wwObj.Eat);
EatDelegate eatChain=zs+ls+ww;
eatChain("吃桔子");
委托當作方法參數進行調用：
代碼
/*委托作為方法的參數進行傳遞*/
/// <summary>
/// 委托作為參數進行傳遞
/// </summary>
/// <param name="food">吃的東西</param>
/// <param name="values">可變的委托參數</param>
static void EatToghter(String food, params EatDelegate[] values)
if (values==null)
{
Console.WriteLine("座談會結束");
}
else
EatDelegate eatChain = null;
foreach (EatDelegate eat in values)
eatChain += eat;
eatChain(food);
Console.WriteLine();
//調用委托作為參數的方法
EatToghter("西瓜",zs,ls,ww);
//沒有傳遞李四的委托
EatToghter("香蕉", zs, ww);
//三個人繼續吃香蕉
EatToghter("香蕉", zs, ls, ww);
EatToghter(null,null);