温故委托

 

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

namespace ConsoleApplication1
{
    class HandlerEventArgs
    {
    }

    //定义事件数据类
    public class BoiledEventArgs : EventArgs
    {
        public readonly int temperature;
        public BoiledEventArgs(int temperature)
        {
            this.temperature = temperature;
        }
    }

    public delegate void BoiledEventHandler(object sender, BoiledEventArgs e);//定义委托

    public class Heater
    {
        private int temperature;
        public string type = "RealFire 001";//添加更多的属性，除了温度,这里的字段描述是:型号

        public string area = "China Xian";//添加产地作为演示 
        public event BoiledEventHandler Boiled;//声明事件       

        //可以供继承自 Heater 的类重写，以便继承类拒绝其他对象对它的监视
        protected virtual void OnBoiled(BoiledEventArgs e)
        {
            if (Boiled != null)//判断是否有注册对象，如有，则运行注册对象方法
            {
                Boiled(this, e);
            }
        }

        public void BoilWater()
        {
            for (int i = 0; i <= 100; i++)
            {
                temperature = i;
                if (temperature > 95)
                {
                    BoiledEventArgs e = new BoiledEventArgs(temperature);
                    OnBoiled(e);//调用OnBoiled
                }
            }
        }
    }



    //警报器
    public class Alarm
    {
        public void MakeAlert(object sender, BoiledEventArgs e)
        {
            Heater heater = (Heater)sender;
            Console.WriteLine("Alarm:{0}-{1}:", heater.area, heater.type);//显示地域等字段信息

            Console.WriteLine("Alarm:滴滴滴，水已经{0}度了:", e.temperature);
            Console.WriteLine();
        }
    }



    //显示器
    public class Display
    {
        public static void ShowMsg(object sender, BoiledEventArgs e)
        {
            Heater heater = (Heater)sender;
            Console.WriteLine("Display:{0}-{1}:", heater.area, heater.type);

            Console.WriteLine("Display:水快烧开了，当前温度：{0}度。", e.temperature);
            Console.WriteLine();
        }
    }

    public class Entrance : Heater
    {
        static void Main(string[] args)
        {
            Heater heater = new Heater();
            Alarm alarm = new Alarm();

            heater.Boiled += alarm.MakeAlert;//注册方法 
            heater.Boiled += new Alarm().MakeAlert;//给匿名方法注册方法

            heater.Boiled += new BoiledEventHandler(alarm.MakeAlert);//全称注册方式
            heater.Boiled += Display.ShowMsg;//注册静态方法

            //heater.Boiled -= alarm.MakeAlert;//注销这个方法

            heater.BoilWater();//调用注册过的方法                       
        }
    }
}