AutomationPeer::ListenerExists Method (AutomationEvents)
.NET Framework (current version)
Gets a value that indicates whether UI Automation is listening for the specified event.
Assembly: PresentationCore (in PresentationCore.dll)
Parameters
- eventId
-
Type:
System.Windows.Automation.Peers::AutomationEvents
One of the enumeration values.
Return Value
Type: System::BooleanA boolean that indicates whether UI Automation is listening for the event.
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.
Note |
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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. |
.NET Framework
Available since 3.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 3.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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