How to sort TreeView items using SortDescriptions in Xaml?

Question

I have a list of Layers binded to a TreeView where each instance has a list of Effects. I show them via a HierarchicalDataTemplate which works great but I am trying to sort them using SortDescriptions.

I don't know how to do this in xaml but doing this sorts only the first level of items, not the sub items:

ICollectionView view = CollectionViewSource.GetDefaultView ( treeView1.ItemsSource );
view.SortDescriptions.Add ( new SortDescription ( "Name", ListSortDirection.Ascending ) );

I am trying to sort them first by .Color, then by .Name.

Any ideas?

EDIT: I added this code:

<Window.Resources>

    <CollectionViewSource x:Key="SortedLayers" Source="{Binding AllLayers}">
        <CollectionViewSource.SortDescriptions>
            <scm:SortDescription PropertyName="Color" />
            <scm:SortDescription PropertyName="Name" />
        </CollectionViewSource.SortDescriptions>
    </CollectionViewSource>

</Window.Resources>

But this still only does it for the first level of hierarchy. How can I specify it for each layer.Effects collection?

Answer 1

I would suggest to use converter to sort sub items. Something like this:

<TreeView Name="treeCategories" Margin="5" ItemsSource="{Binding Source={StaticResource SortedLayers}}">
<TreeView.ItemTemplate>
    <HierarchicalDataTemplate ItemsSource="{Binding Effects, Converter={StaticResource myConverter}, ConverterParameter=EffectName}">
        <TextBlock Text="{Binding Path=LayerName}" />
        <HierarchicalDataTemplate.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Path=EffectName}" />
            </DataTemplate>
        </HierarchicalDataTemplate.ItemTemplate>
    </HierarchicalDataTemplate>
</TreeView.ItemTemplate>

and converter:

public class MyConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        System.Collections.IList collection = value as System.Collections.IList;
        ListCollectionView view = new ListCollectionView(collection);
        SortDescription sort = new SortDescription(parameter.ToString(), ListSortDirection.Ascending);
        view.SortDescriptions.Add(sort);

        return view;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return null;
    }
}