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, , ); //sum = 6
    　　System.Console.WriteLine(sum);
    　　double sub = dc.Foo(mySub, , ); //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();
        }
    }