WinRTXamlToolkit.Controls.Extensions.ListViewBindableSelectionHandler.OnBoundSelectionChanged C# (CSharp) Method

        private void OnBoundSelectionChanged(
            object sender, NotifyCollectionChangedEventArgs e)
        {
            if (e.Action ==
                NotifyCollectionChangedAction.Reset)
            {
                _listView.SelectedItems.Clear();

                foreach (var item in _boundSelection)
                {
                    if (!_listView.SelectedItems.Contains(item))
                    {
                        _listView.SelectedItems.Add(item);
                    }
                }

                return;
            }

            if (e.OldItems != null)
            {
                foreach (var item in e.OldItems)
                {
                    if (_listView.SelectedItems.Contains(item))
                    {
                        _listView.SelectedItems.Remove(item);
                    }
                }
            }

            if (e.NewItems != null)
            {
                foreach (var item in e.NewItems)
                {
                    if (!_listView.SelectedItems.Contains(item))
                    {
                        _listView.SelectedItems.Add(item);
                    }
                }
            }
        }