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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.ComponentModel;
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namespace EventSample
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{
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//定义事件参数类
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public class AlarmEventArgs:EventArgs
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{
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private readonly bool keepingSleep;
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private readonly int numrings;
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//构造函数
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public AlarmEventArgs(bool keepingSleep, int numrings)
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: base()
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{
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this. keepingSleep = keepingSleep;
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this.numrings = numrings;
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}
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//定义属性
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public int NumRings
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{
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get { return numrings; }
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}
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public bool KeepingSleep
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{
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get { return keepingSleep; }
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}
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public string AlarmText
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{
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get
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{
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if ( keepingSleep)
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{
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return ("要迟到了!懒虫快起床!");
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}
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else
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{
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return ("太阳出来啰,起床吧!");
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}
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}
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}
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}
49![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//声明自定义代理类型,它的事件参数的类型为AlarmEventArgs
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public delegate void AlarmEventHandler(object sender, AlarmEventArgs e);
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//包含事件和触发事件方法的类
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public class AlarmClock
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{
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private bool keepingSleep=false ;
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private int numrings=0;
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private bool stop=false ;
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public bool Stop
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{
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get {return stop; }
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set {stop =value ;}
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}
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public bool KeepingSleep
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{
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get {return keepingSleep; }
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set { keepingSleep=value ;}
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}
71![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//声明事件,它所使用的代理类型为AlarmEventHandler
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public event AlarmEventHandler Alarm;
74![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
75![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//触发事件的方法
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protected virtual void OnAlarm(AlarmEventArgs e)
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{
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if (Alarm !=null )
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{
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//通过代理调用事件处理方法
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Alarm (this ,e );
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}
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}
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//在该方法中循环调用OnAlarm方法来触发事件,直到stop字段的值为true
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public void Start()
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{
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for ( ; ; )
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{
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numrings++;
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if (stop)
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{
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break;
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}
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else if (KeepingSleep)
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{
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//程序暂停0.5秒钟
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System.Threading.Thread.Sleep(500);
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{
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//创建事件参数对象实例
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AlarmEventArgs e = new AlarmEventArgs(KeepingSleep, numrings);
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OnAlarm(e);
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//触发事件,在事件处理方法中会相应地设置KeepingSleep和Stop字段的值(通过属性来设置)
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}
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}
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else
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{
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//程序暂停0.3秒
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System.Threading.Thread.Sleep(300);
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AlarmEventArgs e = new AlarmEventArgs(keepingSleep, numrings);
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OnAlarm(e);//触发事件
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}
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}
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}
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}
117![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//包含事件处理方法的类
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public class WakeMeUp
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{
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//事件处理方法,在该方法中根据用户的输入来通过事件参数sender设置事件发送者属性
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public void AlarmRing(object sender, AlarmEventArgs e)
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{
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Console.WriteLine(e.AlarmText + "\n");
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if (!(e.KeepingSleep))
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{
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if (e.NumRings % 10 == 0)
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{
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Console.WriteLine("继续叫你起床!(请输入Y)");
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Console.WriteLine("让你再睡一会儿!(请输入N)");
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Console.WriteLine("停止闹铃!(请输入不同于Y和N的键)");
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string input = Console.ReadLine();
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if (input.Equals("Y") || input.Equals("y")) return;
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else if (input.Equals("N") || input.Equals("n"))
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{
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//通过事件参数sender来访问触发事件的对象
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((AlarmClock)sender).KeepingSleep = true;
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return;
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}
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else
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{
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((AlarmClock)sender).Stop = true;
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return;
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}
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}
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}
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else
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{
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Console.WriteLine("继续叫你起床!(请输入Y)");
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string input = Console.ReadLine();
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if (input.Equals("Y") || input.Equals("y")) return;
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else
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{
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((AlarmClock)sender).Stop = true;
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return;
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}
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}
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}
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}
162![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//包含程序入口方法的类
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public class AlarmDriver
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{
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public static void Main(string[] args)
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{
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//创建事件接收者对象实例
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WakeMeUp waking = new WakeMeUp();
170![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//创建事件发送者对象实例
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AlarmClock clock = new AlarmClock();
173![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//把事件处理方法绑定到发送者的事件上
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clock.Alarm += new AlarmEventHandler(waking.AlarmRing);
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clock.Start();
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}
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}
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}
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