Problem with event...

Problem with event...

• Eric van Feggelen

  Hi,

  the only way to remove an event is using the -= syntax. However if you define you own event i.e.

  event X

  {

  add{...}

  remove{...}

  }

  You can get access the the underlying delegate and then clear out all of the event listeners by resetting the delegate to null.

  Mark.

  
  
  

• Fusion54

  How can i reset the delegate to null
  
  

• li4li4tsai4

  Thanks a lot Mark!
  
  Obs.: To invoke the event: myEventHandler.invoke();
  

• kevlar623

  Hi,

  you will have to define the event manually, i.e.:

  using System;
  using System.Collections.Generic;
  using System.Text;

  namespace ConsoleApplication1
  {
  class Program
  {
  static void Main(string[] args)
  {
  Test t = new Test();
  t.MyEvent += new Test.MyEventHandler(t_MyEvent);

  t.ClearAllListeners();
  }

  static void t_MyEvent()
  {
  
  }
  }

  class Test
  {

  public delegate void MyEventHandler();
  private MyEventHandler myEventHandler = null;

  public event MyEventHandler MyEvent
  {
  add
  {
  myEventHandler = (MyEventHandler)Delegate.Combine(myEventHandler, value);
  }
  remove
  {
  myEventHandler = (MyEventHandler)Delegate.Remove(myEventHandler, value);
  }
  }

  public void ClearAllListeners()
  {
  if (myEventHandler != null)
  {
  myEventHandler = null;
  }
  }
  }
  }

  Mark.

  
  
  
• Problem with event...