Grouping

RadListView provides you with the functionality to programmatically group its data. This can be achieved through adding groupdescriptors to the RadListView.GroupDescriptors collection.

There are two type of descriptors:

  • PropertyGroupDescriptor : You can group the data by a property value from the class that defines your items. This descriptor exposes the following properties:

    • PropertyName : Gets or sets the string name of the property you want to group by.
    • SortOrder : Changes the sort order in each group to Ascending or Descending.
  • DelegateGroupDescriptor : This descriptor enables you to group by a custom key(e.g. some complex expression combining two or more properties) instead of being limited by the value of a single property of your item. This descriptor exposes the following properties:

  • KeyLookup : Gets or sets the IKeyLookup instance used to retrieve the group key for each data item.
  • SortOrder : Changes the sort order in each group to Ascending or Descending.

Example

    <dataControls:RadListView ItemsSource="{Binding}">
        <dataControls:RadListView.Resources>
            <local:Key x:Key="key" />
        </dataControls:RadListView.Resources>
        <dataControls:RadListView.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Name}" />
            </DataTemplate>
        </dataControls:RadListView.ItemTemplate>
        <dataControls:RadListView.GroupDescriptors>
            <dataCore:DelegateGroupDescriptor SortOrder="Descending" KeyLookup="{StaticResource key}" />
        </dataControls:RadListView.GroupDescriptors>
    </dataControls:RadListView>

        List<Item> list = new List<Item>();
        for (int i = 0; i < 10; i++)
        {
            list.Add(new Item { Id = i, Name = "Mr." + i });
        }
        this.DataContext = list;

public class Item
{
    public string Name { get; set; }
    public double Id { get; set; }
}

public class Key : IKeyLookup
{
    public object GetKey(object instance)
    {
        return (instance as Item).Id % 2;
    }
}