Individual objects receive notifications when instance event handlers are used : Delegate event : Delegate C# Examples

Individual objects receive notifications when instance event handlers are used

    
using  System;  
  
delegate  void  MyEventHandler();  
  
class  MyEvent  {  
    public  event  MyEventHandler  SomeEvent;  
  
    public  void  OnSomeEvent()  {  
        if(SomeEvent  !=  null)  
            SomeEvent();  
    }  
}  
  
class  KeyEvent  {  
    int  id;  
  
    public  KeyEvent(int  x)  {  
          id  =  x;  
    }  
  
    public  void  KeyEventHandler()  {  
        Console.WriteLine("Event  received  by  object  "  +  id);  
    }  
}  
  
class  MainClass  {  
    public  static  void  Main()  {    
        MyEvent  evt  =  new  MyEvent();  
        KeyEvent  o1  =  new  KeyEvent(1);  
        KeyEvent  o2  =  new  KeyEvent(2);  
        KeyEvent  o3  =  new  KeyEvent(3);  
  
        evt.SomeEvent  +=  o1.KeyEventHandler;  
        evt.SomeEvent  +=  o2.KeyEventHandler;  
        evt.SomeEvent  +=  o3.KeyEventHandler;  
  
        evt.OnSomeEvent();  
    }  
}
    
   
  
   

Event received by object 1
Event received by object 2
Event received by object 3

Related in same category :
• Creating a new event.
• delegate and event
• A very simple event demonstration.
• An event multicast demonstration
• A static method is used as an event handler
• Creating an event.
• Retrieving Even-Numbered Events with the .NET Delegate Convention
• Retrieving Even-Numbered Events