Handling collection-changed events

The following example demonstrates how to subscribe to the CollectionChanged event of the DataGridCollectionView.SortDescriptions collection's INotifyCollectionChanged interface implementation to be notified when sorting applied to a grid's columns changes.

VB.NET	Copy Code
Protected Overrides Sub OnInitialized(ByVal e As EventArgs) MyBase.OnInitialized(e) Dim view As DataGridCollectionView = TryCast(Me.OrdersGrid.ItemsSource, DataGridCollectionView) AddHandler (CType(view.SortDescriptions, INotifyCollectionChanged)).CollectionChanged, AddressOf SortCollectionChanged End Sub Private Sub SortCollectionChanged(ByVal sender As Object, ByVal e As NotifyCollectionChangedEventArgs) Debug.WriteLine("Sort changed") End Sub

VB.NET

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Protected Overrides Sub OnInitialized(ByVal e As EventArgs)

  MyBase.OnInitialized(e)



  Dim view As DataGridCollectionView = TryCast(Me.OrdersGrid.ItemsSource, DataGridCollectionView)

  AddHandler (CType(view.SortDescriptions, INotifyCollectionChanged)).CollectionChanged,

                                           AddressOf SortCollectionChanged

End Sub

Private Sub SortCollectionChanged(ByVal sender As Object, ByVal e As NotifyCollectionChangedEventArgs)

  Debug.WriteLine("Sort changed")

End Sub

C#	Copy Code
protected override void OnInitialized( EventArgs e ) { base.OnInitialized( e ); DataGridCollectionView view = this.OrdersGrid.ItemsSource as DataGridCollectionView; ( ( INotifyCollectionChanged )view.SortDescriptions ).CollectionChanged += new NotifyCollectionChangedEventHandler( this.SortCollectionChanged ); } private void SortCollectionChanged( object sender, NotifyCollectionChangedEventArgs e ) { Debug.WriteLine( "Sort changed" ); }

Copy Code

protected override void OnInitialized( EventArgs e )

{

  base.OnInitialized( e ); 

  DataGridCollectionView view = this.OrdersGrid.ItemsSource as DataGridCollectionView;

  ( ( INotifyCollectionChanged )view.SortDescriptions ).CollectionChanged +=

                                      new NotifyCollectionChangedEventHandler( this.SortCollectionChanged );

} 

private void SortCollectionChanged( object sender, NotifyCollectionChangedEventArgs e )

{

  Debug.WriteLine( "Sort changed" );

}