ISelectionItemProvider.AddToSelection 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
將目前的項目加入至選取項目的集合。
public:
void AddToSelection();public void AddToSelection ();abstract member AddToSelection : unit -> unitPublic Sub AddToSelection ()範例
下列範例程式代碼會將專案新增至所選專案的集合。
/// <summary>
/// Adds an item to the selection for list boxes that
/// support multiple selection.
/// </summary>
/// <remarks>
/// In a single-selection list box, AddToSelection() is
/// equivalent to Select().
/// selectedItems is the collection of selected ListItems.
/// </remarks>
public void AddToSelection()
{
// Return if the item is already selected.
if (((ISelectionItemProvider)this).IsSelected)
return;
selectedItems.Add(this);
// TODO: Update UI.
}
''' <summary>
''' Adds an item to the selection for list boxes that
''' support multiple selection.
''' </summary>
''' <remarks>
''' In a single-selection list box, AddToSelection() is
''' equivalent to Select().
''' selectedItems is the collection of selected ListItems.
''' </remarks>
Public Sub AddToSelection() Implements ISelectionItemProvider.AddToSelection
' Return if the item is already selected.
If (CType(Me, ISelectionItemProvider)).IsSelected Then
Return
End If
selectedItems.Add(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
如果呼叫 AddToSelection 的結果是已選取單一專案，則傳送 ElementSelectedEvent 該專案的 ，否則 ElementAddedToSelectionEvent 傳送 或 ElementRemovedFromSelectionEvent 。
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。 只有結果很重要。
