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AutomationPeer.ListenerExists Method

Gets a value that indicates whether UI Automation is listening for the specified event.

Namespace: System.Windows.Automation.Peers
Assembly: PresentationCore (in presentationcore.dll)

'Declaration
Public Shared Function ListenerExists ( _
	eventId As AutomationEvents _
) As Boolean
'Usage
Dim eventId As AutomationEvents
Dim returnValue As Boolean

returnValue = AutomationPeer.ListenerExists(eventId)
public static boolean ListenerExists (
	AutomationEvents eventId
)
public static function ListenerExists (
	eventId : AutomationEvents
) : boolean
You cannot use methods in XAML.

Parameters

eventId

One of the enumeration values.

Return Value

A 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.

NoteNote:

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.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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