AutomationElement.CachedParent AutomationElement.CachedParent AutomationElement.CachedParent AutomationElement.CachedParent Property

Definition

Ruft das zwischengespeicherte übergeordnete Element für dieses AutomationElement ab.Gets the cached parent of this AutomationElement.

public:
 property System::Windows::Automation::AutomationElement ^ CachedParent { System::Windows::Automation::AutomationElement ^ get(); };
public System.Windows.Automation.AutomationElement CachedParent { get; }
member this.CachedParent : System.Windows.Automation.AutomationElement
Public ReadOnly Property CachedParent As AutomationElement

Eigenschaftswert

Das übergeordnete Element.The parent element. Der Rückgabewert kann sein null , wenn das angegebene Element über kein übergeordnetes Element verfügt, z. b. Wenn dieses Element der Stamm Knoten ist.The return value can be null if the specified element has no parent - for example, if this element is the root node.

Ausnahmen

Es ist kein übergeordnetes Element zwischengespeichert.No parent element is cached.

Die Benutzeroberfläche für das AutomationElement ist nicht mehr vorhanden.The UI for the AutomationElement no longer exists.

Beispiele

Im folgenden Beispiel werden die Name Eigenschaften eines Listen Felds und seine Listenelemente zwischengespeichert.In the following example, the Name properties of a list box and its list items are cached. Das Listenfeld Element ist in der CachedParent -Eigenschaft der einzelnen Listenelement Elemente verfügbar.The list box element is available in the CachedParent property of each list item element.

/// <summary>
/// Gets a list box element and caches the Name property of its children (the list items).
/// </summary>
/// <param name="elementMain">The UI Automation element for the parent window.</param>
void CachePropertiesWithScope(AutomationElement elementMain)
{
    AutomationElement elementList;

    // Set up the CacheRequest.
    CacheRequest cacheRequest = new CacheRequest();
    cacheRequest.Add(AutomationElement.NameProperty);
    cacheRequest.TreeScope = TreeScope.Element | TreeScope.Children;

    // Activate the CacheRequest and get the element. Note that the scope of the CacheRequest
    // is in relation to the object being retrieved: the list box and its children are 
    // cached, not the main window and its children.
    using (cacheRequest.Activate())
    {
        // Load the list element and cache the specified properties for its descendants.
        Condition cond = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.List);
        elementList = elementMain.FindFirst(TreeScope.Children, cond);
    }
    if (elementList == null) return;

    // The following illustrates that the children of the list are in the cache.
    foreach (AutomationElement listItem in elementList.CachedChildren)
    {
        Console.WriteLine(listItem.Cached.Name);
    }

    // The following call raises an exception, because the IsEnabled property was not cached.
    /*** Console.WriteLine(listItem.Cached.IsEnabled); ***/

    // The following illustrates that because the list box itself was cached, it is now
    // available as the CachedParent of each list item.
    AutomationElement child = elementList.CachedChildren[0];
    Console.WriteLine(child.CachedParent.Cached.Name);
}
''' <summary>
''' Gets a list box element and caches the Name property of its children (the list items).
''' </summary>
''' <param name="elementMain">The UI Automation element for the parent window.</param>
Sub CachePropertiesWithScope(ByVal elementMain As AutomationElement)
    Dim elementList As AutomationElement

    ' Set up the CacheRequest.
    Dim cacheRequest As New CacheRequest()
    cacheRequest.Add(AutomationElement.NameProperty)
    cacheRequest.TreeScope = TreeScope.Element Or TreeScope.Children

    ' Activate the CacheRequest and get the element. Note that the scope of the CacheRequest
    ' is in relation to the object being retrieved: the list box and its children are 
    ' cached, not the main window and its children.
    Using cacheRequest.Activate()
        ' Load the list element and cache the specified properties for its descendants.
        Dim myCondition As New PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.List)
        elementList = elementMain.FindFirst(TreeScope.Children, myCondition)

        If elementList Is Nothing Then
            Return
        End If

        ' The following illustrates that the children of the list are in the cache.
        Dim listItem As AutomationElement
        For Each listItem In elementList.CachedChildren
            Console.WriteLine(listItem.Cached.Name)
        Next listItem

        ' The following call raises an exception, because the IsEnabled property was not cached.
        '** Console.WriteLine(listItem.Cached.IsEnabled) **

        ' The following illustrates that because the list box itself was cached, it is now
        ' available as the CachedParent of each list item.
        Dim child As AutomationElement = elementList.CachedChildren(0)
        Console.WriteLine(child.CachedParent.Cached.Name)
    End Using
End Sub

Gilt für:

Siehe auch