委托与事件
class MyEventArgs : EventArgs { private int _light; public MyEventArgs(int light) { _light = light; } public int Light { get { return _light; } } } class LightSender { //声明委托 public delegate void LightEventHander(object sender, MyEventArgs e); //声明开灯事件 public event LightEventHander LightEvent; //声明关灯事件 public event LightEventHander CloseEvent; public void OnLightEvent() { //判断发送者是否为null LightEventHander hander = LightEvent; if (hander != null) { bool judge = true; while (judge) { Console.WriteLine("请输入当前亮度："); int light = Convert.ToInt32(Console.ReadLine()); MyEventArgs e = new MyEventArgs(light); if (e.Light < 30) { LightEvent(this, e);//触发开灯事件 } if (e.Light == 30) { CloseEvent(this, e);//触发关灯事件 } } } } } class Program { public Program() { LightSender ls = new LightSender(); //绑定LightEvent事件 ls.LightEvent += new LightSender.LightEventHander(ls_LightEvent); //绑定CloseEvent事件 ls.CloseEvent += new LightSender.LightEventHander(ls_CloseEvent); ls.OnLightEvent(); } static void Main(string[] args) { Program p = new Program(); } /// <summary> /// 关闭事件处理程序 /// </summary> /// <param name="sender">事件发送者</param> /// <param name="e">事件状态</param> static void ls_CloseEvent(object sender, MyEventArgs e) { Console.WriteLine("CloseEvent事件响应：天明了——关灯"); } /// <summary> /// 开灯时间处理程序 /// </summary> /// <param name="sender">事件发送者</param> /// <param name="e">事件状态</param> static void ls_LightEvent(object sender, MyEventArgs e) { Console.WriteLine("LightEvent事件响应：天已黑——开灯"); } }
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