Sorting

RadListView provides you with the functionality to programmatically sort its data. This can be achieved through adding SortDescriptors to its RadListView.SortDescriptors collection.

There are two type of descriptors:

• PropertySortDescriptor : You can sort 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 that is used to retrieve the key to sort by.
  • SortOrder: Changes the sort order to Ascending or Descending.
  • Comparer: Gets or sets a custom IComparer instance. If this property is null, the default comparer will be used.

• DelegateSortDescriptor : This descriptor enables you to sort 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 sort key for each data item.
  • SortOrder: Changes the sort order to Ascending or Descending.
  • Comparer: Gets or sets a custom IComparer instance. If this property is null, the default comparer will be used.

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.SortDescriptors>
            <dataCore:DelegateSortDescriptor SortOrder="Descending" KeyLookup="{StaticResource key}" />
        </dataControls:RadListView.SortDescriptors>
    </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;
        }
    }