How to know a event handler alreay added to invoke list

[Ryan Liu]

Hi,

Can someone tell me how to know a event handler alreay added to invoke list?

For example, how can I know
tvwLeft_AfterSelect2 is already added to tvwLeft.AfterSelect so I won't
do it again?

this.tvwLeft.AfterSelect += new TreeViewEventHandler(tvwLeft_AfterSelect);


Thanks!
Ryan

 

[Mattias Sjögren]

Ryan,

For example, how can I know
tvwLeft_AfterSelect2 is already added to tvwLeft.AfterSelect so I won't
do it again?

You can't access the event invocation list from outside the class so
you have to keep that information in a boolean flag or something.


Mattias

 

[Marc Gravell]

Well, /generally/ removing something that isn't there doesn't raise an
exception, so you could just remove it first (even if not there), then
add. Or keep track.

Marc