# 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**

```C#
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**

```C#
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**

```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**

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

![WinUI ](https://www.telerik.com/winui/documentation/assets/0c536e80fc967d10106c2dcc355f46fd/radlistview-sorting-0.png)