ISelectionItemProvider.RemoveFromSelection Methode

Definition

Namespace:

System.Windows.Automation.Provider

Assembly:

UIAutomationProvider.dll

Entfernt das aktuelle Element aus der Sammlung ausgewählter Elemente.

public:
 void RemoveFromSelection();

public void RemoveFromSelection ();

abstract member RemoveFromSelection : unit -> unit

Public Sub RemoveFromSelection ()

Beispiele

Der folgende Beispielcode entfernt das Element aus einer Auflistung ausgewählter Elemente.

/// <summary>
/// Removes the item from the selection in list boxes that support 
/// multiple selection or no selection at all.
/// </summary>
/// <remarks>
/// selectedItems is the collection of selected ListItems.
/// </remarks>
public void RemoveFromSelection()
{
    // Return if the item is already selected.
    if (((ISelectionItemProvider)this).IsSelected)
        return;
    if (((ISelectionProvider)this).IsSelectionRequired & selectedItems.Count <= 0)
        throw new InvalidOperationException("Operation cannot be performed.");

    selectedItems.Remove(this);
    // TODO: Update UI.
}

''' <summary>
''' Removes the item from the selection in list boxes that support 
''' multiple selection or no selection at all.
''' </summary>
''' <remarks>
''' selectedItems is the collection of selected ListItems.
''' </remarks>
Public Sub RemoveFromSelection() Implements ISelectionItemProvider.RemoveFromSelection
    ' Return if the item is already selected.
    If (CType(Me, ISelectionItemProvider)).IsSelected Then
        Return
    End If
    If (CType(Me, ISelectionProvider)).IsSelectionRequired And selectedItems.Count <= 0 Then
        Throw New InvalidOperationException("Operation cannot be performed.")
    End If

    selectedItems.Remove(Me)
    ' TODO: Update UI.
End Sub

/// <summary>
/// Specifies whether the item is selected.
/// </summary>
/// <remarks>
/// selectedItems is the collection of selected ListItems.
/// </remarks>
public bool IsSelected
{
    get
    {
        return selectedItems.Contains(this);
    }
}

''' <summary>
''' Specifies whether the item is selected.
''' </summary>
''' <remarks>
''' selectedItems is the collection of selected ListItems.
''' </remarks>
Public ReadOnly Property IsSelected() As Boolean Implements ISelectionItemProvider.IsSelected
    Get
        Return selectedItems.Contains(Me)
    End Get
End Property

Hinweise

Senden Sie nach Bedarf eine ElementRemovedFromSelectionEvent .

Hinweis

Diese Regel hängt nicht davon ab, ob der Container eine oder mehrere Auswahlmöglichkeiten zulässt oder welche Methode zum Ändern der Auswahl verwendet wurde. Nur das Ergebnis ist wichtig.

Weitere Informationen

• Implementieren des SelectionItem-Steuerelementmusters der Benutzeroberflächenautomatisierung
• Beispiel für einen Fragmentanbieter