Hi there,
I wonder if anyone can help, i need to unsubscribe from an event but i don't know the method at runtime.. Probably better if i explain with an example..
myGraphics.Click += new EventHandler(myGraphics_Cl
I then pass around myGraphics to difference forms so i need to reset the .Click event to myGraphics_Click but the problem is that it is still set to myGraphics_click on the original form before it was passed so hence the event fires on both forms :-)
Is there a way i can NULL the click event or something, or iterate through all subscribers to the click event so i can decide how to unsubscribe..
The problem is that i will probably have to unsubscribe the original form when i have arrived in my new form...
Confused? I am :-) .... Any ideas how to do this... really apprecaite any help
thanks in advance
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Just remember the EventHandler that you added, then remove the same instance.
private EventHandler ClickEventHandler;
when you subscribe ...
ClickEventHandler = new EventHandler(myGraphics_Cl
myGraphics.Clicked += ClickEventHandler;
to unsubscribe ...
myGraphics.Clicked -= ClickEventHandler;
Cheers,
Greg
Thanks greg! i sort of have it working...
I had to make the event a static event because when the ovject with the click evetn arrives in another form I don't have a reference to it ... so i technically can't do myGraphics.Clicked -= ClickEventHandler; or it would try to unsubscribe in the current form whcih i haven't subscribed to yet... I presume i am correct on this?
Is there anyway i can check the object to see if anything has subscribed.... as i was getting a double event somewhere in my code.... so if i could do
if myGraphics.clicked == OriginalForm.ClickEventHan
{
// hass been subscribed in original form
// then unsubscribe....
// then subscribe in this form
}
else
{
// jsut subscribe in this form..
}
You can only do those sorts of tests from within the myGraphics class itself. Anything outside the class can only ever do += or -= to an event 'variable'.
How about doing if ( OriginalForm != null ) { ... unsubscribe} rather than checking the handler...
Alternatively, it's perfectly OK to detach events that have never been attached... (it'll just do nothing). So myGraphics.clicked -= OriginalForm.ClickEventHan
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by: AlexNekPosted on 2007-03-28 at 10:09:30ID: 18809919
I hope, this help
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