C#入门学习笔记之事件和委托的实例

/// <summary> 
/// 工人类 
/// </summary> 
class Worker 
{ 
//记录工人的名称 
public string Name { get; set; } 
 
public Worker(string name)  
{ 
this.Name = name; 
} 
 
//定义一个委托 
public delegate void WorkOverEventHandler(object sender, WorkOverEventArgs e); 
 
//定义一个基于委托的事件 
public event WorkOverEventHandler WorkOver; 
 
//为了引发被委托的事件而创建的OnWorkOver方法 
public void OnWorkOver(object sender, WorkOverEventArgs e) 
{ 
if (WorkOver != null) 
{ 
WorkOver(sender, e); 
} 
} 
} 

/// <summary> 
/// 用来记录工作结束的相关消息 
/// </summary> 
class WorkOverEventArgs : EventArgs 
{ 
//记录下班时间 
public DateTime OverTime { get; set; } 
 
//记录留言 
public string Message { get; set; } 
 
public WorkOverEventArgs() 
{ 
this.OverTime = DateTime.Now; 
} 
 
public WorkOverEventArgs(string strMsg) 
{ 
this.OverTime = DateTime.Now; 
this.Message = strMsg; 
} 
} 

/// <summary> 
/// 经理类 
/// </summary> 
class Manager 
{ 
//根据取得的sender和e内的信息显示Worker给经理的留言 
public void WorkerOverShowMessage(object sender, WorkOverEventArgs e) 
{ 
Console.WriteLine("Manager类 ==> 来自{0}的留言：“{1}”", (sender as Worker).Name, e.Message); 
} 
} 

/// <summary> 
/// 时间管理  www.jbxuecom
/// </summary> 
class Timer 
{ 
//根据取得的sender和e内的信息显示下班的时间 
public static void WorkerOverShowTime(object sender, WorkOverEventArgs e) 
{ 
Console.WriteLine("Timer类 ==> {0}的下班时间 : {1}", (sender as Worker).Name, e.OverTime.ToLongTimeString()); 
} 
} 

class Program 
{ 
static void Main(string[] args) 
{ 
Worker Tom = new Worker("Tom"); 
Manager manager = new Manager(); 
 
//向Tom类添加经理类的事件 
Tom.WorkOver += new Worker.WorkOverEventHandler(manager.WorkerOverShowMessage); 
 
//向Tom类添加时间的处理 
Tom.WorkOver += new Worker.WorkOverEventHandler(Timer.WorkerOverShowTime); 
 
//处理消息类的信息 
WorkOverEventArgs e = new WorkOverEventArgs(); 
e.Message = "我下班了"; 
 
Tom.OnWorkOver(Tom, e); 
 
Console.Read(); 
} 
}