Gets a value that indicates whether UI Automation is listening for the specified event.
Assembly: System.Windows (in System.Windows.dll)
'Declaration Public Shared Function ListenerExists ( _ eventId As AutomationEvents _ ) As Boolean
- Type: System.Windows.Automation.Peers.AutomationEvents
One of the enumeration values.
Return ValueType: System.Boolean
true if UI Automation is listening for the specified event; otherwise, false.
Typically, you call this method before you create the AutomationPeer that raises the event. This method is a performance measure, because if UI Automation is not listening for the event, it does not make sense to create a peer to raise the event.
This method is static. It returns true only if a delegate is listening for the specified event in UI Automation. It does not indicate whether the delegate is listening for an event on a specific object. UI Automation can create broadcast listeners. Therefore, the per-object information is irrelevant.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.