Is there any way to dynamically sort data bound items in a RadListBox and keep them sorted

[Timothy J]

We have a RadListBox bound to a ObservableCollection of models.  We would like sort them based on a property.  The property value can also change.  Is there any way to sort them?

What we are trying to do is create a "mover" to rank items, is a RadListBox not the best choice?

[Martin Ivanov]

Hello Timothy,

The RadListBox control itself doesn't have a built-in sorting feature, but you can use a collection view implementation like QueryableCollectionView (QCV) that provides support for this. Note that with the QueryableCollectionView an update of the underlying property value (used in the sorting), won't update the current view automatically. You should force this manually by calling the Reset method of the SortDescriptors collection of the QCV.

queryableCollectionView.SortDescriptors.Reset();

In case you need the view to get updated automatically on property changed, you can use the native ListCollectionView implementation. For example:

ListCollectionView cv = (ListCollectionView)CollectionViewSource.GetDefaultView(originalSource);
cv.IsLiveSorting = true;
cv.SortDescriptions.Add(new SortDescription("MySortingValue", ListSortDirection.Descending));
this.radListBox.ItemsSource = cv;

You can see this approach in the attached project. I hope it helps.

Regards,
Martin Ivanov
Progress Telerik