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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 that will be applied to the aggregate.
  • Caption—Defines the caption of the aggregate. You can use Caption to display text in the UI.
  • Format—Defines the string format that will be applied over the aggregated value.

The PropertyAggregateDescriptor supports the following KnownFunction aggregates:

  • Sum - The Sum function sumarizes all values in the column.
  • Min - The Minimum value of the cells in the column.
  • Max - The Maximum value of the cells in the column.
  • Average - The Average value of the cells in the column.
  • Count - The COUNT function counts the items in the column.
  • Product - The PRODUCT function multiplies all the numbers given as arguments and returns the product.
  • StdDev - The Standard Deviation is a measure of how widely values are dispersed from the average value, based on a sample function.
  • StdDevP - The Standard Deviation is a measure of how widely values are dispersed from the average value, based on the entire population function.
  • Var - The Variance is a measure of dispersion, based on a sample function.
  • VarP - The Variance is a measure of dispersion, based on the entire population function.

The following example shows how to add a PropertyAggregateDescriptor to the DataGrid's Columns. It will take the values from the Name, Price, DeliveryPrice and Quantity properties of the row model and the result will be the Min and Max prices as well as Average price for delivery and the Count of the listed items.

<telerik:RadDataGrid x:Name="dataGrid"
                     UserGroupMode="Disabled"
                     AutoGenerateColumns="False"
                     UserEditMode="Cell"
                     ShowColumnFooters="True">
    <telerik:RadDataGrid.Columns>
        <telerik:DataGridTextColumn PropertyName="Name">
            <telerik:DataGridTextColumn.AggregateDescriptors>
                <telerik:PropertyAggregateDescriptor PropertyName="Name"
                                                     Function="Count"
                                                     Caption="Total count: " />
            </telerik:DataGridTextColumn.AggregateDescriptors>
        </telerik:DataGridTextColumn>
        <telerik:DataGridNumericalColumn PropertyName="Price"
                                         CellContentFormat="{}{0:C}">
            <telerik:DataGridNumericalColumn.AggregateDescriptors>
                <telerik:PropertyAggregateDescriptor PropertyName="Price"
                                                     Function="Min" 
                                                     Format="C"
                                                     Caption="Cheapest item: " />
                <telerik:PropertyAggregateDescriptor PropertyName="Price" 
                                                     Function="Max" 
                                                     Format="C"
                                                     Caption="Priciest item: " />
            </telerik:DataGridNumericalColumn.AggregateDescriptors>
        </telerik:DataGridNumericalColumn>
        <telerik:DataGridNumericalColumn PropertyName="DeliveryPrice"
                                         HeaderText="Delivery Price"
                                         CellContentFormat="{}{0:C}">
            <telerik:DataGridNumericalColumn.AggregateDescriptors>
                <telerik:PropertyAggregateDescriptor PropertyName="DeliveryPrice"
                                                     Function="Average"
                                                     Format="C"
                                                     Caption="Average: " />
            </telerik:DataGridNumericalColumn.AggregateDescriptors>
        </telerik:DataGridNumericalColumn>
        <telerik:DataGridNumericalColumn PropertyName="Quantity">
            <telerik:DataGridNumericalColumn.AggregateDescriptors>
                <telerik:PropertyAggregateDescriptor PropertyName="Quantity"
                                                     Function="Sum"
                                                     Caption="Total amount: " />
            </telerik:DataGridNumericalColumn.AggregateDescriptors>
        </telerik:DataGridNumericalColumn>
    </telerik:RadDataGrid.Columns>
</telerik:RadDataGrid>

Property Aggregate Descriptor

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