IEditableCollectionView.CancelNew Metode

Definisi

Ruang nama:

System.ComponentModel

Rakitan:

WindowsBase.dll

Mengakhiri transaksi add dan membuang item baru yang tertunda.

public:
 void CancelNew();

public void CancelNew ();

abstract member CancelNew : unit -> unit

Public Sub CancelNew ()

Contoh

Contoh berikut menampilkan formulir yang meminta pengguna untuk menambahkan item baru. Jika pengguna mengirimkan formulir, contoh akan memanggil CommitNew untuk menambahkan item ke koleksi. Jika pengguna membatalkan formulir, contoh akan memanggil CancelNew untuk membuang item. Untuk seluruh sampel, lihat Mengubah Koleksi dengan Menggunakan Sampel IEditableCollectionView.

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