观察者模式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Car cat = new Car();
            Mouse mouse1 = new Mouse("mouse1", cat);
            Mouse mouse2 = new Mouse("mouse2", cat);
            Master master = new Master(cat);
            cat.Cry();

            Console.ReadLine();
        }
    }

  

    interface Observer //观察者的响应(针对那一个对象)
    {
        void Reaponse();
    }

    interface Subject//针对那些观察者(也就是遇到的对象)
    {
        void AimAt(Observer obs);
    }

    class Mouse : Observer
    {
        private string Name;

        public Mouse(string name, Subject sb)
        {
            this.Name = name;
            sb.AimAt(this);
        }

        public void Reaponse()
        {
            Console.WriteLine(Name + " attempt to escape!");
        }
    }

    class Master : Observer
    {
        public Master(Subject sb)
        {
            sb.AimAt(this);
        }

        public void Reaponse()
        {
            Console.WriteLine("Host waken!");
        }

    }

    class Car : Subject//这就是猫的响应和执行的对象
    {
        ArrayList arrs;
        public Car()
        {
            arrs = new ArrayList();

        }
        public void AimAt(Observer obs)//它的对象就是叫一声
        {
            arrs.Add(obs);
        }

        public void Cry()
        {
            Console.WriteLine("Cat cryed!");
            foreach (Observer lsg in this.arrs)
            {

                lsg.Reaponse();

            }
        }
    }

 

}