Expand Wpf Treeview to support Sorting

Question

Hi I created this small example, and I would like to expand it to support Sorting.

public class Country
{
    public string Name { get; set; }
    public int Sor         


        

Answer 1

You can also use the CollectionViewSource.GetDefaultView with ListCollectionView to do the sorting for you, tho you do have to set it for all the child collections as well. I use a linq query to flatten my list to find all the children and set the sorting.

foreach (var structure in Model.Structures.Flatten(t => t.SubItems))
{
    var view = CollectionViewSource
        .GetDefaultView(structure.SubItems) as ListCollectionView;

    if (view != null)
    {
        view.CustomSort = (x,y) => string.Compare( x, y );
    }
}

elsewhere

public static IEnumerable Flatten(
    this IEnumerable list, Func> subitems)
{
    foreach (T child in list)
    {
        yield return child;

        foreach (T other in Flatten(subitems(child), subitems))
        {
            yield return other;
        }
    }
}