Binding SortOrder in PropertyGroupDescriptor in CollectionView

Updated on Feb 26, 2026

Environment

Version	Product	Author
13.0.0	Telerik UI for .NET MAUI CollectionView	Dobrinka Yordanova

Description

I attempted to bind the SortOrder property in the PropertyGroupDescriptor in a grouped CollectionView, but encountered the error:

No property, BindableProperty, or event found for "SortOrder", or mismatching type between value and property.

This issue arises because the SortOrder property is not bindable. I need a solution to dynamically manage the sort order.

This knowledge base article also answers the following questions:

• How can I implement dynamic sorting in CollectionView?
• How do I use attached properties for PropertyGroupDescriptor in .NET MAUI?
• How can I change the sort order programmatically in CollectionView?

Solution

Use one of the following approaches to manage the SortOrder dynamically:

• Approach 1: Managing GroupDescriptors Collection
• Approach 2: Using Attached Property

Approach 1: Managing GroupDescriptors Collection

Clear and re-add the GroupDescriptors collection with the desired SortOrder:

csharp

this.collectionview.GroupDescriptors.Clear();
this.collectionview.GroupDescriptors.Add(new PropertyGroupDescriptor
{
    PropertyName = nameof(ReceiptModel.TransactionDateMonth),
    SortOrder = SortOrder.Descending
});

Approach 2: Using Attached Property

Define an attached property on the CollectionView level to bind and update the SortOrder. Follow these steps:

1. Create a static class to define the attached property:

csharp

public static class TelerikUtils
{
    public static readonly BindableProperty MySortOrderProperty =
        BindableProperty.CreateAttached("MySortOrder", typeof(SortOrder), typeof(TelerikUtils), SortOrder.Ascending, propertyChanged: OnMySortOrderChanged);

    public static SortOrder GetMySortOrder(BindableObject bindable)
    {
        return (SortOrder)bindable.GetValue(MySortOrderProperty);
    }

    public static void SetMySortOrder(BindableObject bindable, SortOrder value)
    {
        bindable.SetValue(MySortOrderProperty, value);
    }

    private static void OnMySortOrderChanged(BindableObject bindable, object oldValue, object newValue)
    {
        RadCollectionView cv = (RadCollectionView)bindable;
        var descriptor = cv.GroupDescriptors.FirstOrDefault();
        SortOrder mySortOrder = (SortOrder)newValue;
        descriptor.SortOrder = mySortOrder;
    }
}

2. Bind the SortOrder property to the ViewModel using the attached property in XAML:

xaml

<telerik:RadCollectionView local:TelerikUtils.MySortOrder="{Binding SortingOrder}" ...>
    <telerik:RadCollectionView.GroupDescriptors>
        <telerik:PropertyGroupDescriptor PropertyName="TransactionDateMonth" />
    </telerik:RadCollectionView.GroupDescriptors>
</telerik:RadCollectionView>

3. Create a ViewModel with a property for SortingOrder:

csharp

public class MainPageViewModel : NotifyPropertyChangedBase
{
    private SortOrder sortingOrder = SortOrder.Ascending;

    public SortOrder SortingOrder
    {
        get => sortingOrder;
        set
        {
            if (sortingOrder != value)
            {
                sortingOrder = value;
                OnPropertyChanged();
            }
        }
    }
}

4. For example, on a button or another UI element modify the SortingOrder:

csharp

private void Button_Clicked(object sender, EventArgs e)
{
    ViewModel.SortingOrder = ViewModel.SortingOrder == SortOrder.Ascending ? SortOrder.Descending : SortOrder.Ascending;
}

See Also

• Grouping with RadCollectionView
• CollectionView Overview
• Bindable Properties in .NET MAUI