AutomationPeer.ListenerExists Method (AutomationEvents)
Gets a value that indicates whether UI Automation is listening for the specified event.
Assembly: PresentationCore (in PresentationCore.dll)
Typically, you call this method before creating the AutomationPeer that raises the event. This method is a performance measure because if UI Automation does not listen for the event, it does not make sense to create a peer to raise one.
This method is static and only answers if a delegate listens for the specified event in UI Automation, not for an event on a specific element. UI Automation can create broadcast listeners; therefore the per-element information is irrelevant.
Available since 3.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0