C#委托的详细使用

代码如下：

    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();
        }
    }