#region// 定义BoiledEventArgs类，传递给Observer所感兴趣的信息public class BoiledEventArgs : EventArgs{public readonly int temperature;public BoiledEventArgs(int temperature){this.temperature = temperature;}}//热水器public class Heared {public string type = "RealFire 001";       // 添加型号作为演示public string area = "China Xian";         // 添加产地作为演示private int temperature;public delegate void BoidHandler(Object sender, BoiledEventArgs e); //声明委托public event BoidHandler BoidEvent;  //声明事件// 可以供继承自 Heared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 (BoidEvent != null){ // 如果有对象注册BoidEvent(this, e);  // 调用所有注册对象的方法
            }}//烧水public void BoilWater() {for (int i = 0; i < 100; i++){temperature = i;if (temperature>95){//建立BoiledEventArgs 对象。BoiledEventArgs e = new BoiledEventArgs(temperature);OnBoiled(e);  // 调用 OnBolied方法
                }}}}// 警报器public class Alarm{public void MakeAlert(Object sender, BoiledEventArgs e){Heared heater = (Heared)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();}}// 显示器public class Display{public static void ShowMsg(Object sender,BoiledEventArgs e){   //静态方法Heared heater = (Heared)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(){Heared heater = new Heared();Alarm alarm = new Alarm();heater.BoidEvent += alarm.MakeAlert;   //注册方法heater.BoidEvent += (new Alarm()).MakeAlert;      //给匿名对象注册方法heater.BoidEvent += new Heared.BoidHandler(alarm.MakeAlert);    //也可以这么注册heater.BoidEvent += 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
        }}
#endregion