c#的事件机制示例代码: 猫> 老鼠, 主人

using System;

namespace EventDemo
{


    public delegate void CatBrayEventHandle(int score);


    public class sleeping
    {
        public event CatBrayEventHandle CatShout;

        int theScore;

        public int Score
        {
            get {return theScore;}
            set
            {
                if(theScore != value)
                {
                    CatShout(value);
                }
            }
        }
    }




    public class MouseRun
    {
        public MouseRun(sleeping slp)
        {
            slp.CatShout += new CatBrayEventHandle(slp_CatShout);
        }

        private void slp_CatShout(int score)
        {
            if(score > 100)
                Console.WriteLine("老鼠: 有猫!快逃啊..");
            else
                Console.WriteLine("老鼠: 猫虽然叫了, 声音不够大, 赫赫, 老鼠没听见!");
        }
    }


    public class Master
    {
        public Master(sleeping sleep)
        {
            sleep.CatShout += new CatBrayEventHandle(sleep_CatShout);
        }

        private void sleep_CatShout(int score)
        {
            if(score > 100)
                Console.WriteLine("主人: 猫叫了!");
            else
                Console.WriteLine("主人: 猫虽然叫了, 声音不够大, 主人没听见!");
        }
    }




    /**//// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    class Class1
    {
        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            sleeping slping = new sleeping();

            MouseRun mr = new MouseRun(slping);
            Master ms = new Master(slping);

            //slping.Score = 66;
            slping.Score = 123;


        }
    }
}