ISelectionItemProvider.RemoveFromSelection 方法

  • 參考

定義

命名空間:
System.Windows.Automation.Provider
組件:
UIAutomationProvider.dll

從選取項目的集合移除目前的項目。

public:
 void RemoveFromSelection();
public void RemoveFromSelection ();
abstract member RemoveFromSelection : unit -> unit
Public Sub RemoveFromSelection ()

範例

下列範例程式碼會從選取的專案集合中移除專案。

/// <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

備註

ElementRemovedFromSelectionEvent視需要傳送 。

注意

此規則不取決於容器是否允許單一或多個選取專案，或用來變更選取範圍的方法。 只有結果才重要。

適用於

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