CODEWITHSUNDEEP
c#silverlighteventswindows-phone-7.1application-bar
Eric Philippe
Eric Philippe

Reputation: 205

Add/remove event subscriber in application bar item?

Why would I do that, anyway? Here it is: My application bar item respond to click like this:

 <shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Click="Customization" x:Name="Custom"

It allows the user to go to settings page, but the user still has something to do before the app navigates. The actual event that will make the app navigates is triggered by a normal button. So, before, the user do that, I'd like to remove the event suscriber from the application bar item. If I try this in the beginning of method "Customization":

 Custom.Click -= new System.EventHandler(Customization);

I got NullReferenceException.

That's how I do for my "normal" items and it works. This is the first time I'm using a System.EventHandler, so there's probably something that I'm missing.

Later in the scenario, I'd like to be able to re-add this suscriber to the application bar item. Any help appreciated, thank you.

Upvotes: 2

Views: 206

Answers (1)

simple-thomas
simple-thomas

Reputation: 729

You can't access AppBarButtons that way.

Try

((ApplicationBarIconButton)ApplicationBar.Buttons[0]).Click -= new System.EventHandler(Customization);

Upvotes: 2

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