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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)
You cannot use methods in XAML.

Parameters

eventId
Type: System.Windows.Automation.Peers.AutomationEvents

One of the enumeration values.

Return Value

Type: System.Boolean
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 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0

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