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AutomationElement.GetUpdatedCache Method

Retrieves a new AutomationElement with an updated cache.

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

public AutomationElement GetUpdatedCache(
	CacheRequest request


Type: System.Windows.Automation.CacheRequest

The patterns and properties to include in the updated cache.

Return Value

Type: System.Windows.Automation.AutomationElement
A new AutomationElement that has an updated cache.

The original AutomationElement is unchanged. GetUpdatedCache returns a new AutomationElement, that refers to the same user interface (UI) and has the same RuntimeIdProperty.

The following example demonstrates how a cache might be updated whenever the selection in a combo box changes.

CacheRequest comboCacheRequest;
AutomationEventHandler selectHandler;
AutomationElement elementCombo;
AutomationElement selectedItem;

/// <summary> 
/// Retrieves a combo box automation element, caches a pattern and a property, 
/// and registers the event handler. 
/// </summary> 
/// <param name="elementAppWindow">The element for the parent window.</param>
private void SetupComboElement(AutomationElement elementAppWindow)
    // Set up the CacheRequest.
    comboCacheRequest = new CacheRequest();
    comboCacheRequest.TreeScope = TreeScope.Element | TreeScope.Descendants;

    // Activate the CacheRequest and get the element. 
    using (comboCacheRequest.Activate())
        // Load the combo box element and cache the specified properties and patterns.
        Condition propCondition = new PropertyCondition(
            AutomationElement.AutomationIdProperty, "comboBox1", PropertyConditionFlags.IgnoreCase);
        elementCombo = elementAppWindow.FindFirst(TreeScope.Descendants, propCondition);

    // Get the list from the combo box.
    Condition propCondition1 = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.List);
    AutomationElement listElement = elementCombo.FindFirst(TreeScope.Children, propCondition1);

    // Register for ElementSelectedEvent on list items. 
    if (listElement != null)
        Automation.AddAutomationEventHandler(SelectionItemPattern.ElementSelectedEvent, listElement,
            TreeScope.Children, selectHandler = new AutomationEventHandler(OnListItemSelect));

/// <summary> 
/// Handle ElementSelectedEvent on items in the combo box. 
/// </summary> 
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
private void OnListItemSelect(object src, AutomationEventArgs e)
    // Update the cache.
    AutomationElement updatedElement = elementCombo.GetUpdatedCache(comboCacheRequest);

    // Retrieve the pattern and the selected item from the cache. This code is here only to  
    // demonstrate that the current selection can now be retrieved from the cache. In an application, 
    // this would be done only when the information was needed.
    SelectionPattern pattern = updatedElement.GetCachedPattern(SelectionPattern.Pattern) as SelectionPattern;
    AutomationElement[] selectedItems = pattern.Cached.GetSelection();
    selectedItem = selectedItems[0];

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