C#委托的详细使用

public delegate void GreetingDelegate(string name);//定义委托，它定义了可以代表方法的类型
class Program
{
public static void EnglishGreeting(string name)
{
Console.WriteLine("Moring,"+name);
}

public static void ChineseGreeting(string name)
{
Console.WriteLine("早上好，"+name);
}

//注意此方法，他接收一个GreetingDelegate类型的方法作为参数
public static void GreetingPeople(string name,GreetingDelegate MakeGreeting)
{
MakeGreeting(name);
}

static void Main(string[] args)
{
//版本1
//GreetingPeople("Jake", EnglishGreeting);//英文问好
//GreetingPeople("王旭", ChineseGreeting);//中文问好

//版本2
//string name1, name2;
//name1 = "Jack";
//name2 = "王旭";
//GreetingPeople(name1,EnglishGreeting);
//GreetingPeople(name2,ChineseGreeting);

//版本3
//GreetingDelegate delegate1, delegate2;
//delegate1 = EnglishGreeting;
//delegate2 = ChineseGreeting;
//GreetingPeople("Jack",delegate1);
//GreetingPeople("王旭",delegate2);

//版本4
/*
注意：这里第一次使用"="是赋值的语法，第二次使用"+="是绑定的语法("-="取消绑定),如果第一次就使用"+="将会出现"使用了未赋值的局部变量"的编译错误
*/
//GreetingDelegate delegate1;
//delegate1 = EnglishGreeting;//先给委托类型的变量赋值
//delegate1 += ChineseGreeting;//在给此委托变量绑定一个值
//GreetingPeople("Jack",delegate1);//将先后调用EnglishGreeting和ChineseGreeting方法

//版本5
//GreetingDelegate delegate1;
//delegate1 = EnglishGreeting;
//delegate1 += ChineseGreeting;
//delegate1("Jack");

//版本6
//GreetingDelegate delegate1 = new GreetingDelegate(EnglishGreeting);
//delegate1 += ChineseGreeting;
//delegate1("Jack");

//版本7
GreetingDelegate delegate1 = new GreetingDelegate(EnglishGreeting);
delegate1 += ChineseGreeting;
//将先后调用EnglishGreeting和ChineseGreeting方法
GreetingPeople("Jack",delegate1);

delegate1 -= EnglishGreeting;//取消对EnglishGreeting方法的绑定
GreetingPeople("王旭",delegate1);//只显示ChineseGreeting方法

Console.ReadLine();
}
}