委托 delegate

public delegate string MyDelegate(int num1);

class Program{

static void Main(string[] args){

 int t1 = Test1(Show);

Program1 p1 = new Program1();
int t2 = Test1(p1.Display);
}


public static string Show(int num){

     return "人数为："+ num;

}


public static int Test1(MyDelegate myDel){

   string str = myDel(3);

　 return str.Length;

}

}


public class Program1{
　　public string Display(int a){
　　return "车辆数为："+ a;
　　}
}

public delegate int MyDelegate(int a， int b);

int calc(int a, int b, MyDeletgate operation){

return operation(a,b);

}


int add(int a, int b){

return a+b;

}

int minus(int a, int b){

 return a-b;

}

int plus(int a ,int b ){

 return a*b;

}

int divide(int a, int b){

　　return a/b;

}

public delegate void MyDelegate();
    class Program
    {
        static void Main(string[] args)
        {
            MyClass mc = new MyClass();

            DoSth(mc.DoTime);
            //DoSth(WriteTime);
            Console.ReadKey();
        }
        public static void DoSth(MyDelegate mdl)
        {
            Console.WriteLine("吃早饭");
            Console.WriteLine("读书");
            Console.WriteLine("飞流直下三千尺");
            Console.WriteLine("疑是银河落九天");
            //做事 不知道做什么
            mdl();
           // Console.WriteLine(System.DateTime.Now.ToString());
            //File.WriteAllText("1.txt",System.DateTime.Now.ToString());
            Console.WriteLine("吃饭");

        }
        public static void ShowTime()
        {
            Console.WriteLine(System.DateTime.Now.ToString());
        }

        public static void WriteTime()
        {
            File.WriteAllText("1.txt",System.DateTime.Now.ToString());
        }