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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
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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