Unsubscribe lambda expression from event c#

Question

I have the following code attaching event handler:

this.btnOK.Click += (s,e) => { MessageBox.Show("test");  };

Can I unsubscribe that lambda expression from the vent?

You can't unsubscribe anonymous function because it is anonymous and you can't access it. Possible solution you can find on http://stackoverflow.com/questions/9745280/how-to-unsubscribe-an-anonymous-function-in-dispose-method-of-a-class. You cant unsubscribe anonoy — y0j0, May 06 '14 at 05:42

score 6 · Accepted Answer · edited Jul 03 '17 at 12:28

6

Why don't just save the assigned lambda?

 EventHandler lambda = (s,e) => { MessageBox.Show("test");  };

 ...

 this.btnOK.Click += lambda;

 ... 

 this.btnOK.Click -= lambda;

edited Jul 03 '17 at 12:28

Romano Zumbé

answered May 06 '14 at 05:40

Dmitry Bychenko

Ugh, nothing worse than pressing the Enter key by mistake. – Lews Therin May 06 '14 at 05:41

score -2 · Answer 2 · answered May 06 '14 at 05:41

-2

You cannot un-assign that event because it is a anonymous method.

Give it a name and you are ready to unsubscribe.

answered May 06 '14 at 05:41

score -3 · Answer 3 · answered May 06 '14 at 05:41

-3

you can do :

this.btnOK.Click = null;

answered May 06 '14 at 05:41

Adrián Romero

1

But this would cause all the `subscribed events` to go to drain – now he who must not be named. May 06 '14 at 05:42
1

@nowhewhomustnotbenamed., this can cause only the compiler error. – Hamlet Hakobyan May 06 '14 at 05:44
yes, my solution delete all subscriptions. the solution proposed by @Dmitry Bychenko is much better – Adrián Romero May 06 '14 at 05:50
1

@Bob, you "solution" doing nothing except causing compiler error. – Hamlet Hakobyan May 06 '14 at 05:54

3 Answers3