C#(委托a)

C#(委托a)
    public delegate double TheOperator(double x, double y);    
        
    public class Operators    
    {    
    　static public double Add(double x, double y)    
    　{    
    　　return x + y;    
    　}    
        
    　static public double Sub(double x, double y)    
    　{    
    　　return x - y;    
    　}    
        
    　//乘，除法 我也懒得废话了    
    }    
        
    public class DotNet_Calculator    
    {    
    　public double Foo(TheOperator op, double x, double y)    
    　{    
    　　return op(x, y);    
    　}    
    }    
        
    public class TheMainClass    
    {    
    　static public void Main()    
    　{    
    　　TheOperator myAdd = new TheOperator(Operators.Add);    
    　　TheOperator mySub = new TheOperator(Operators.Sub);    
        
    　　DotNet_Calculator dc = new DotNet_Calculator();    
    　　double sum = dc.Foo(myAdd, 2, 4); //sum = 6    
    　　System.Console.WriteLine(sum);    
    　　double sub = dc.Foo(mySub, 3, 7); //sub = -4    
    　　System.Console.WriteLine(sub);    
    　}    
    }    



C#(委托b)
//小张类
    public class MrZhang
    {
        //其实买车票的悲情人物是小张
        public static void BuyTicket()
        {
            Console.WriteLine("NND,每次都让我去买票，鸡人呀！");
        }
    }

    //小明类
    class MrMing
    {
        //声明一个委托，其实就是个“命令”
        public delegate void BugTicketEventHandler();

        public static void Main(string[] args)
        {
            //这里就是具体阐述这个命令是干什么的，本例是MrZhang.BuyTicket“小张买车票”
            BugTicketEventHandler myDelegate = new BugTicketEventHandler(MrZhang.BuyTicket);

            //这时候委托被附上了具体的方法
            myDelegate();
            Console.ReadKey();
        }
    }