C#委托、事件学习之（三）——热水器烧水案例

来源：互联网发布：网络推销员好做吗编辑：程序博客网时间：2024/04/27 18:24
using System;namespace DelegateExample{    public class Heater    {        private int temperature;        public string type = "RealFire 001"; // 添加型号作为演示        public string area = "China Xi'an"; // 添加产地作为演示                                            //声明委托        public delegate void BoiledEventHandler(Object sender, BoiledEventArgs e);        public event BoiledEventHandler Boiled; //声明事件                                                // 定义BoiledEventArgs类，传递给Observer所感兴趣的信息                                                //继承EventArgs        public class BoiledEventArgs : EventArgs        {            public readonly int temperature;//            public BoiledEventArgs(int temperature)            {                this.temperature = temperature;            }        }        // 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)            { // 如果有对象注册                Boiled(this, e); // 调用所有注册对象的方法            }        }        public void BoilWater()        {            for (int i = 100; i <= 100; i++)            {                temperature = i;                if (temperature > 95)                {                    //建立BoiledEventArgs 对象。                    BoiledEventArgs e = new BoiledEventArgs(temperature);                    OnBoiled(e); // 调用 OnBoiled方法                }            }        }    }    public class Alarm    {        public void MakeAlert(Object sender, Heater.BoiledEventArgs e)        {            Heater heater = (Heater)sender; //这里是不是很熟悉呢？                                            //访问 sender 中的公共字段            Console.WriteLine("Alarm：{0} - {1}: ", heater.area, heater.type);            Console.WriteLine("Alarm: 嘀嘀嘀，水已经 {0} 度了：", e.temperature);            Console.WriteLine();        }    }    public class Display    {        public static void ShowMsg(Object sender, Heater.BoiledEventArgs e)        { //静态方法            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();        }    }    class Program    {        static void Main()        {            Heater heater = new Heater();            Alarm alarm = new Alarm();            heater.Boiled += alarm.MakeAlert; //注册方法            heater.Boiled += (new Alarm()).MakeAlert; //给匿名对象注册方法            heater.Boiled += new Heater.BoiledEventHandler(alarm.MakeAlert); //也可以这么注册            heater.Boiled += Display.ShowMsg; //注册静态方法            heater.BoilWater(); //烧水，会自动调用注册过对象的方法        }    }}
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