StructureChangedEventArgs(StructureChangeType, Int32[]) Konstruktor

public:
 StructureChangedEventArgs(System::Windows::Automation::StructureChangeType structureChangeType, cli::array <int> ^ runtimeId);

public StructureChangedEventArgs (System.Windows.Automation.StructureChangeType structureChangeType, int[] runtimeId);

new System.Windows.Automation.StructureChangedEventArgs : System.Windows.Automation.StructureChangeType * int[] -> System.Windows.Automation.StructureChangedEventArgs

Public Sub New (structureChangeType As StructureChangeType, runtimeId As Integer())

Parameter

Beispiele

Das folgende Beispiel zeigt, wie Sie ein Ereignis erstellen und auslösen, wenn untergeordnete Elemente einem benutzerdefinierten Listenfeld hinzugefügt oder entfernt werden.

/// <summary>
/// Responds to an addition to the UI Automation tree structure by raising an event.
/// </summary>
/// <param name="list">
/// The list to which the item was added.
/// </param>
/// <remarks>
/// For the runtime Id of the item, pass 0 because the provider cannot know
/// what its actual runtime Id is.
/// </remarks>
public static void OnStructureChangeAdd(CustomListControl list)
{
    if (AutomationInteropProvider.ClientsAreListening)
    {
        int[] fakeRuntimeId = { 0 };
        StructureChangedEventArgs args =
            new StructureChangedEventArgs(StructureChangeType.ChildrenBulkAdded, 
            fakeRuntimeId);
        AutomationInteropProvider.RaiseStructureChangedEvent(
            (IRawElementProviderSimple)list.Provider, args);
    }
}

/// <summary>
/// Responds to a removal from the UI Automation tree structure 
/// by raising an event.
/// </summary>
/// <param name="list">
/// The list from which the item was removed.
/// </param>
/// <remarks>
/// For the runtime Id of the list, pass 0 because the provider cannot know
/// what its actual runtime ID is.
/// </remarks>
public static void OnStructureChangeRemove(CustomListControl list)
{
    if (AutomationInteropProvider.ClientsAreListening)
    {
        int[] fakeRuntimeId = { 0 };
        StructureChangedEventArgs args =
            new StructureChangedEventArgs(StructureChangeType.ChildrenBulkRemoved, 
            fakeRuntimeId);
        AutomationInteropProvider.RaiseStructureChangedEvent(
            (IRawElementProviderSimple)list.Provider, args);
    }
}

''' <summary>
''' Responds to an addition to the UI Automation tree structure by raising an event.
''' </summary>
''' <param name="list">
''' The list to which the item was added.
''' </param>
''' <remarks>
''' For the runtime Id of the item, pass 0 because the provider cannot know
''' what its actual runtime Id is.
''' </remarks>
Public Shared Sub OnStructureChangeAdd(ByVal list As CustomListControl)
    If AutomationInteropProvider.ClientsAreListening Then
        Dim fakeRuntimeId(1) As Integer
        fakeRuntimeId(0) = 0
        Dim args As New StructureChangedEventArgs( _
            StructureChangeType.ChildrenBulkAdded, fakeRuntimeId)
        AutomationInteropProvider.RaiseStructureChangedEvent( _
            CType(list.Provider, IRawElementProviderSimple), args)
    End If

End Sub


''' <summary>
''' Responds to a removal from the UI Automation tree structure by raising an event.
''' </summary>
''' <param name="list">
''' The list from which the item was removed.
''' </param>
''' <remarks>
''' For the runtime Id of the list, pass 0 because the provider cannot know
''' what its actual runtime ID is.
''' </remarks>
Public Shared Sub OnStructureChangeRemove(ByVal list As CustomListControl)
    If AutomationInteropProvider.ClientsAreListening Then
        Dim fakeRuntimeId(1) As Integer
        fakeRuntimeId(0) = 0
        Dim args As New StructureChangedEventArgs( _
            StructureChangeType.ChildrenBulkRemoved, fakeRuntimeId)
        AutomationInteropProvider.RaiseStructureChangedEvent( _
            CType(list.Provider, IRawElementProviderSimple), args)
    End If

End Sub

Hinweise

Die Werte, die zurückgegeben structureChangeType werden können, hängen von der Implementierung des Benutzeroberflächenautomatisierung-Anbieters ab. Wenn z. B. Elemente aus einem Win32-Listenfeld hinzugefügt oder entfernt werden, kann der Anbieter die Anzahl der hinzugefügten oder entfernten Elemente nicht ermitteln, möglicherweise angeben ChildrenInvalidated und nicht oder ChildRemovednichtChildAdded.

In der folgenden Tabelle werden die Informationen im Ereignis beschrieben, das von den StructureChangedEventHandler verschiedenen Strukturänderungen empfangen wird.

Benutzerdefinierte Steuerelemente können möglicherweise keinen aussagekräftigen Wert in runtimeId. Weitere Informationen finden Sie unter RaiseStructureChangedEvent.

Gilt für

Siehe auch

• RuntimeIdProperty