Raising Event with e.Cancel property

Here is a routine for catching an application before it closes. You just need to handle the OnApplicationClosing event to cancel it out.

#region ApplicationClose Routine

private System.ComponentModel.CancelEventHandler onApplicationClosing;

public event System.ComponentModel.CancelEventHandler ApplicationClosing
{
add{onApplicationClosing += value;}
remove{onApplicationClosing -= value;}
}

protected virtual void OnApplicationClosing(System.ComponentModel.CancelEventArgs e)
{
if(onApplicationClosing != null)
{
onApplicationClosing(this, e);
}
}

private EventHandler onApplicationClosed;

public event EventHandler ApplicationClosed
{
add{onApplicationClosed += value;}
remove{onApplicationClosed -= value;}
}

protected virtual void OnApplicationClosed()
{
if(onApplicationClosed != null)
{
onApplicationClosed(this, EventArgs.Empty);
}
}

public void ApplicationClose()
{
System.ComponentModel.CancelEventArgs e = new System.ComponentModel.CancelEventArgs();

OnApplicationClosing(e);
if(!e.Cancel)
{
OnApplicationClosed();
}
}

#endregion

Yes, in the excellent sample above, OnApplicationClosing will call any delegates hooked to the ApplicationClosing event. Should any of the delegates cancel the event, the ApplicationClosedEvent wouldn't be raised. Presumably any other work involved in closing the application would also not be performed.

- mike

Great! Thanks guys, I just wanted to make sure that it wasn't going to do anything weird like roll through the code and keep going becasue it calls the delgate and then continues.