IEditableCollectionView.CancelNew 方法

定義

命名空間:

System.ComponentModel

組件:

WindowsBase.dll

結束加入異動並捨棄暫止的新項目。

public:
 void CancelNew();

public void CancelNew ();

abstract member CancelNew : unit -> unit

Public Sub CancelNew ()

範例

下列範例會顯示一個窗體，提示使用者新增專案。 如果使用者提交窗體，範例會呼叫 CommitNew 以將專案新增至集合。 如果使用者取消窗體，則範例會呼叫 CancelNew 以捨棄專案。 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