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AutomationPeer.ListenerExists Method

.NET Framework 4.5

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

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

public static bool ListenerExists(
	AutomationEvents eventId
)

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.

Remarks

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
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.

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Reference

AutomationPeer Class

System.Windows.Automation.Peers Namespace

Other Resources

UI Automation Overview

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