IEditableCollectionView.AddNew Method

Reference

Definition

Namespace:: System.ComponentModel

Assembly:: WindowsBase.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Adds a new item to the collection.

public:
 System::Object ^ AddNew();

public object AddNew();

abstract member AddNew : unit -> obj

Public Function AddNew () As Object

Returns

Object

The new item that is added to the collection.

Examples

The following example creates a Window that prompts the user to add a new item. Then it calls AddNew to create a new object and sets the DataContext of the Window to that object. For the entire sample, see Changing a Collection by Using IEditableCollectionView Sample.

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

Remarks

Calling AddNew begins an add transaction. You should call CommitNew or CancelNew to end the add transaction. A new item always appears in the collection view. Any filtering, sorting, or grouping that is applied to the view is applied to the new item when CommitNew is called.

Applies to

Produkt	Verzie
.NET Framework	3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop	3.0, 3.1, 5, 6, 7, 8, 9, 10

Zdieľať cez