# PropertyAggregateDescriptor

The `PropertyAggregateDescriptor` allows you to define a property and a function that are applied over the property values of the DataGrid, which accumulates an aggregated result based on the component data.

To set up the `PropertyAggregateDescriptor`, use the following properties:

* `PropertyName`—Defines the name of the property that is used to compute the aggregate value.
* `Function`—Defines a [`KnownFunction` value](https://www.telerik.com/winui/documentation/controls/raddatagrid/aggregates/datagrid-overview) that will be applied to the aggregate.
* `Caption`—Defines the caption of the aggregate. You can use `Caption` to display text in the UI when the `AggregatesTemplate` is set.
* `Format`—Defines the string format that will be applied over the aggregated value.

To display the aggregates, set the `AggregatesTemplate` property of the DataGrid column that will display the value. The data context in the template is a collection of `AggregateResult` objects. Each `AggregateResult` contains the `Caption` of the aggregate, the aggregated value, and the value with the applied `Format`.

The following example shows how to add a `PropertyAggregateDescriptor` to the DataGrid. It will take the values from the `Value` property of the row model and the result will be the `Sum` value. You can get the aggregate values by using the `GetAggregateValue` and `GetAggregateValues` methods of the [`IDataView`](https://www.telerik.com/winui/documentation/controls/raddatagrid/dataview) interface.

```XAML
<telerikGrid:RadDataGrid ItemsSource="{Binding Items}" AutoGenerateColumns="False">
	<telerikGrid:RadDataGrid.Columns>
		<telerikGrid:DataGridTextColumn PropertyName="Value">
			<telerikGrid:DataGridTextColumn.AggregatesTemplate>
				<DataTemplate>
					<StackPanel Orientation="Horizontal" VerticalAlignment="Center">
						<TextBlock Text="{Binding [0].Caption}" />
						<TextBlock Text="{Binding [0].FormattedValue}" Margin="5 0 0 0" />
					</StackPanel>
				</DataTemplate>
			</telerikGrid:DataGridTextColumn.AggregatesTemplate>
		</telerikGrid:DataGridTextColumn>
	</telerikGrid:RadDataGrid.Columns>
	<telerikGrid:RadDataGrid.AggregateDescriptors>
		<telerikData:PropertyAggregateDescriptor PropertyName="Value" Function="Sum" Caption = "Total: " Format = "C" />
	</telerikGrid:RadDataGrid.AggregateDescriptors>
</telerikGrid:RadDataGrid>
```

The previous example uses the following namespaces:

```XAML
xmlns:telerikGrid="using:Telerik.UI.Xaml.Controls.Grid"
xmlns:telerikCore="using:Telerik.Data.Core"
```

**DataGrid with a Defined PropertyAggregateDescriptor**

![WinUI ](https://www.telerik.com/winui/documentation/assets/3ef17ce3f0e9b5f5efc0d931c513bb64/datagrid-aggregates-propertyaggregatedescriptor-0.png)