SelectionPattern.InvalidatedEvent 字段

public: static initonly System::Windows::Automation::AutomationEvent ^ InvalidatedEvent;

public static readonly System.Windows.Automation.AutomationEvent InvalidatedEvent;

 staticval mutable InvalidatedEvent : System.Windows.Automation.AutomationEvent

Public Shared ReadOnly InvalidatedEvent As AutomationEvent 

字段值

示例

在下面的示例中，为该事件侦听器声明了一 InvalidatedEvent个事件侦听器。

///--------------------------------------------------------------------
/// <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
}

'''--------------------------------------------------------------------
''' <summary>
''' Subscribe to the selection events of interest.
''' </summary>
''' <param name="selectionContainer">
''' Automation element that supports SelectionPattern
''' </param>
'''--------------------------------------------------------------------
Private Sub SetSelectionEventHandlers( _
ByVal selectionContainer As AutomationElement)
    Dim selectionInvalidatedHandler As AutomationEventHandler = _
    New AutomationEventHandler(AddressOf OnSelectionInvalidatedHandler)

    Automation.AddAutomationEventHandler( _
    SelectionPattern.InvalidatedEvent, _
    selectionContainer, TreeScope.Element, selectionInvalidatedHandler)

End Sub

'''--------------------------------------------------------------------
''' <summary>
''' Selection invalidated event handler.
''' </summary>
''' <param name="src">Object that raised the event.</param>
''' <param name="e">Event arguments.</param>
'''--------------------------------------------------------------------
Private Sub OnSelectionInvalidatedHandler( _
ByVal src As Object, ByVal e As AutomationEventArgs)
    ' TODO: event handling
End Sub

注解

当容器中的选定内容发生显著更改并且需要发送比 InvalidateLimit 常量允许更多的加法和删除事件时，将引发无效事件。

此标识符由UI 自动化客户端应用程序使用。 UI 自动化提供程序应使用 SelectionPatternIdentifiers 中的等效字段。