SingleEvent

• Package: MyToolkit.Extended
• Platforms: WP7SL, WP8SL, WinRT, UWP, SL5, WPF

Provides methods to register an event callback which is called only once.

Methods:

• Register: Registers an event which is called only once and then deregistered:

   SingleEvent.Register(element,
   	(e, h) => e.LostFocus += h,
   	(e, h) => e.LostFocus -= h,
   	OnLostFocus);
   
   // TODO: Implement OnLostFocus method which is called only once and deregistred automatically. 

• WaitForEventAsync (WinRT only): Used to wait for an event:

   var args = await SingleEvent.WaitForEventAsync(element,
   	(element, handler) => element.LostFocus += handler,
   	(element, handler) => element.LostFocus -= handler);