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

Example 1: Defining the item model and key lookup

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; 
    } 
} 

Example 2: Populating with data

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

Example 3: Adding a sort descriptor in XAML

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

The namespaces used in XAML point to:

Example 4: Telerik namespace definitions

xmlns:telerikData="using:Telerik.UI.Xaml.Controls.Data" 
xmlns:dataCore="using:Telerik.Data.Core"