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Generic Based Event Handling Demo for VS.Net 2005

/ Published in: C#
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Annotated version of the Microsoft/GotDotNet demo from the MSDN Wiki.

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  1. //Define a custom EventArgs class to contain your data.  
  2.   public class MyEventArgs : EventArgs
  3.   {
  4.     public string info = "data";
  5.   }
  6.  
  7. //Declare the event as visible to users of the class
  8.  
  9.   public event EventHandler<MyEventArgs> MyEvent;
  10.  
  11.  
  12. //Send the event, note that this will throw a nullref if there are no subscribers 
  13.  
  14.   //Internal version prevents outsiders from needing to know about the contents of MyEventArgs
  15.   protected virtual void InternalSendMyEvent(CustomEventArgs e)
  16.   {
  17.     if(MyEvent != null)
  18.     {
  19.       e.info = "Hello Events!"; 
  20.       //This calls all registered subscribers with the following parameters.   
  21.       MyEvent(this, e);
  22.     }
  23.   }
  24.  
  25.   //Public version to allow outsiders to trigger the event, not typical implementation.   
  26.   public void CreateEvent()
  27.   {
  28.     InternalSendMyEvent(new MyEventArgs());
  29.   }
  30.  
  31.  
  32.  
  33. //Consumer
  34. //Register the Handler
  35.  
  36.   eventRaiser.MyEvent += new EventHandler<CustomEventArgs>(HandleEvent);
  37.  
  38. //Define the Handler
  39.   private void HandleEvent(object sender, MyEventArgs e)
  40.   {
  41.     MessageBox.Show("Event handled:" + e.info);
  42.   }
  43.  
  44.  
  45. //Cause the Event
  46.   eventRaiser.CreateEvent();

URL: http://msdnwiki.microsoft.com/en-us/mtpswiki/402101b6-555d-4cf7-b223-1d9fdfaaf1cd.aspx

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