共用方式為


IEditableCollectionView.CanAddNew 屬性

定義

取得值,這個值表示新項目是否可以加入至此集合。

public:
 property bool CanAddNew { bool get(); };
public bool CanAddNew { get; }
member this.CanAddNew : bool
Public ReadOnly Property CanAddNew As Boolean

屬性值

如果新項目可以加入集合,則為 true;否則為 false

範例

下列範例會檢查是否可以將專案新增至集合。 如果 CanAddNewfalse,則此範例會告知用戶無法新增專案。 否則,它會顯示表單,提示使用者新增專案。 如需整個範例,請參閱 使用 IEditableCollectionView 範例變更集合

IEditableCollectionView editableCollectionView = 
    itemsControl.Items as IEditableCollectionView; 

if (!editableCollectionView.CanAddNew)
{
    MessageBox.Show("You cannot add items to the list.");
    return;
}

// Create a window that prompts the user to enter a new
// item to sell.
ChangeItemWindow win = new ChangeItemWindow();

//Create a new item to be added to the collection.
win.DataContext = editableCollectionView.AddNew();

// If the user submits the new item, commit the new
// object to the collection.  If the user cancels 
// adding the new item, discard the new item.
if ((bool)win.ShowDialog())
{
    editableCollectionView.CommitNew();
}
else
{
    editableCollectionView.CancelNew();
}
Dim editableCollectionView As IEditableCollectionView = TryCast(itemsControl.Items, IEditableCollectionView)

If Not editableCollectionView.CanAddNew Then
    MessageBox.Show("You cannot add items to the list.")
    Return
End If

' Create a window that prompts the user to enter a new
' item to sell.
Dim win As New ChangeItemWindow()

'Create a new item to be added to the collection.
win.DataContext = editableCollectionView.AddNew()

' If the user submits the new item, commit the new
' object to the collection.  If the user cancels 
' adding the new item, discard the new item.
If CBool(win.ShowDialog()) Then
    editableCollectionView.CommitNew()
Else
    editableCollectionView.CancelNew()
End If

備註

IEditableCollectionView如果下列專案成立,則可以新增專案:

適用於