Unsubscribing from events.

[Pete Davis]

I came across the following code in the .NET Framework:

((IBindingList) list).ListChanged -= new
ListChangedEventHandler(this.List_ListChanged);

In other places, they hold onto a reference to the original event handler
instance and unsubscribe that. I've always held the references and
unsubscribed the original myself.

Unsubscribing from a new instance instead of the original instance just
seems wrong. Yet one of my co-workers claims this actually works. Does it?

Pete

 

[Nicholas Paldino [.NET/C# MVP]]

Pete,

Yes, it works. I wouldn't waste the field to hold onto this. It's the
method that is the identity of the delegate, not the instance of the
delegate itself.

Hope this helps.

 

[Pete Davis]

That's what my co-worker said, but I just wanted to be sure. Thanks
Nicholas.

Pete

Pete,

Yes, it works. I wouldn't waste the field to hold onto this. It's the
method that is the identity of the delegate, not the instance of the
delegate itself.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

I came across the following code in the .NET Framework:

((IBindingList) list).ListChanged -= new
ListChangedEventHandler(this.List_ListChanged);

In other places, they hold onto a reference to the original event handler
instance and unsubscribe that. I've always held the references and
unsubscribed the original myself.

Unsubscribing from a new instance instead of the original instance just
seems wrong. Yet one of my co-workers claims this actually works. Does it?

Pete