'宣言
Protected Overrides Sub OnItemsChanged( _ ByVal e As NotifyCollectionChangedEventArgs _ )
protected override void OnItemsChanged( NotifyCollectionChangedEventArgs e )
'宣言
Protected Overrides Sub OnItemsChanged( _ ByVal e As NotifyCollectionChangedEventArgs _ )
protected override void OnItemsChanged( NotifyCollectionChangedEventArgs e )