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SelectionPattern.InvalidatedEvent Field

Identifies the event that is raised when a selection in a container has changed significantly and requires sending more addition and removal events than the InvalidateLimit constant permits.

Namespace:  System.Windows.Automation
Assembly:  UIAutomationClient (in UIAutomationClient.dll)

public static readonly AutomationEvent InvalidatedEvent

An invalidated event is raised when a selection in a container has changed significantly and requires sending more addition and removal events than the InvalidateLimit constant permits.

This identifier is used by UI Automation client applications. UI Automation providers should use the equivalent field in SelectionPatternIdentifiers.

In the following example, an event listener is declared for the InvalidatedEvent.

///-------------------------------------------------------------------- 
/// <summary> 
/// Subscribe to the selection events of interest. 
/// </summary> 
/// <param name="selectionContainer">
/// Automation element that supports SelectionPattern 
/// </param> 
///-------------------------------------------------------------------- 
private void SetSelectionEventHandlers
    (AutomationElement selectionContainer)
{            
    AutomationEventHandler selectionInvalidatedHandler =
        new AutomationEventHandler(SelectionInvalidatedHandler);

    Automation.AddAutomationEventHandler(
        SelectionPattern.InvalidatedEvent, 
        selectionContainer, 
        TreeScope.Element, 
        SelectionInvalidatedHandler);
}

///-------------------------------------------------------------------- 
/// <summary> 
/// Selection invalidated event handler. 
/// </summary> 
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
///-------------------------------------------------------------------- 
private void SelectionInvalidatedHandler(object src, AutomationEventArgs e)
{
    // TODO: event handling
}

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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