煮水器（.Net中的委托与事件）

热水器类：

 

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

namespace AboutDelegate4
{
    public class Heater
    {
        private int temperature;
        public string type = "REALFIRE 001";
        public string area = "China";

        public delegate void BoilEventHandler(object sender, BoilEventArgs e);//委托声明
        public event BoilEventHandler Boiled;//事件声明

        /// <summary>
        /// 定义BoiledEventArgs类，传递给Observer所感兴趣的信息
        /// </summary>
        public class BoilEventArgs:EventArgs
        {
            public readonly int temperature;
            public BoilEventArgs(int temperature)//构造函数
            {
                this.temperature = temperature;
            }
        }

        /// <summary>
        /// 煮水函数，在这个函数中调用所有注册的对象的方法
        /// </summary>
        /// <param name="e"></param>
        protected virtual void OnBoiled(BoilEventArgs e)
        {
            if (Boiled!=null)//如果对象有注册
            {
                Boiled(this, e);//调用所有注册的对象的方法
            }
        }

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

    }
}

 

 

警报器类：

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

namespace AboutDelegate4
{
    public class Alarm
    {
        public void MakeAlert(object sender, Heater.BoilEventArgs e)
        {
            Heater heater = (Heater)sender;
            Console.WriteLine("Alarm:{0}---{1}", heater.area, heater.type);
            Console.WriteLine("Alarm:嘟嘟嘟，水已经{0}度了！",e.temperature);
            Console.WriteLine();
        }
    }
}

 

显示器类：

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

namespace AboutDelegate4
{
    public class Display
    {
        public static void ShowMsg(object sender,Heater.BoilEventArgs e)
        {
            Heater heater = (Heater)sender;
            Console.WriteLine("Display:{0}---{1}", heater.area, heater.type);
            Console.WriteLine("Display:水已经开了，当前温度为{0}度", e.temperature);
            Console.WriteLine();
        }
    }
}