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Group Footers

In addition to displaying summaries/results from aggregates in the group header (see this topic), RadGrid exposes group footers feature which provides the option to render footer under each group in the grid. The type of this footer item is GridGroupFooterItem . To enable this functionality merely set the ShowGroupFooter property of the respective GridTableView instance to true (its default value is false).
grid grouping groupfooters

RadGrid also gives you the opportunity to retain the visibility of the group footers when their corresponding group header row is collapsed. In order to switch on this feature, just set the GroupingSettings.RetainGroupFooterVisibility property to true.

The group footers are most commonly used to visualize calculations from aggregate functions within the scope of the current group. Furthermore, with nested groups you will have group footer for each inner group along with one for the main group. Aggregate calculations are supported for GridBoundColumns, GridCalculatedColumns and GridTemplateColumns.

In order to specify how the group aggregates will be evaluated, specify in every GridBoundColumn/GridCalculatedColumn/GridTemplateColumn the Aggregate property which accepts values from the GridAggregateFunction enumeration. The options available for the GridAggregateFunction enumeration are listed below:

GridAggregateFunction enumeration members

Member Description
Sum Returns the sum of all column values in the source
Min Returns the min value from the source column
Max Returns the max value from the source column
Last Returns the last value from the source column
First Returns the first value from the source column
Count Returns the count of source column values
Avg Returns the average value from the source column values
Custom Raises OnCustomAggregate event where the custom result can be set using the e.Result argument
None Default value, no aggregate function applied
note

RadGrid will calculate aggregates over the entire data source and will respect the filter expression applied (if present).

note

The default style applied for the group footers will be this set for the common footer of the corresponding table.

This online demo represents the functionality in question. Review the code excerpt below for additional details:

<asp:ScriptManager ID="ScriptManager1" runat="server" />
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
  <AjaxSettings>
    <telerik:AjaxSetting AjaxControlID="RadGrid1">
      <UpdatedControls>
        <telerik:AjaxUpdatedControl ControlID="RadGrid1" />
      </UpdatedControls>
    </telerik:AjaxSetting>
  </AjaxSettings>
</telerik:RadAjaxManager>
<telerik:RadGrid ShowGroupPanel="true" AutoGenerateColumns="false" ID="RadGrid1"
  DataSourceID="SqlDataSource1" AllowFilteringByColumn="True" AllowSorting="True"
  ShowFooter="True" runat="server" GridLines="None" AllowPaging="true" Skin="WebBlue">
  <PagerStyle Mode="NextPrevAndNumeric" />
  <MasterTableView ShowGroupFooter="true" AllowMultiColumnSorting="true">
    <Columns>
      <telerik:GridBoundColumn Aggregate="Count" DataField="ProductID" HeaderText="Product ID"
        FooterText="Total products: ">
      </telerik:GridBoundColumn>
      <telerik:GridBoundColumn DataField="ProductName" HeaderText="Product name" SortExpression="ProductName"
        UniqueName="ProductName">
      </telerik:GridBoundColumn>
      <telerik:GridBoundColumn Aggregate="Sum" DataField="UnitPrice" HeaderText="Unit price"
        FooterText="Total price: ">
      </telerik:GridBoundColumn>
      <telerik:GridBoundColumn Aggregate="Sum" DataField="UnitsInStock" HeaderText="Units in stock"
        FooterText="All units in stock: ">
      </telerik:GridBoundColumn>
      <telerik:GridCalculatedColumn HeaderText="Total Price" UniqueName="TotalPrice" DataType="System.Double"
        DataFields="UnitPrice, UnitsInStock" Expression="{0}*{1}" FooterText="Total : "
        Aggregate="Sum" />
    </Columns>
    <GroupByExpressions>
      <telerik:GridGroupByExpression>
        <GroupByFields>
          <telerik:GridGroupByField FieldName="UnitPrice" />
        </GroupByFields>
        <SelectFields>
          <telerik:GridGroupByField FieldName="UnitPrice" HeaderText="Unit price" />
        </SelectFields>
      </telerik:GridGroupByExpression>
    </GroupByExpressions>
  </MasterTableView>
  <ClientSettings AllowDragToGroup="true" />
</telerik:RadGrid>
<br />
<asp:SqlDataSource ID="SqlDataSource1" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
  SelectCommand="SELECT * FROM Products Where UnitPrice > 9.50" runat="server"></asp:SqlDataSource>

Aggregates with Paging Enabled

By default, group aggregates are calculated only for the currently loaded records on the present page view.
grid grouping groupfooters 1

In some cases it may prove more convenient to include all group records in the summarized calculation info. In such cases, the following property comes to play:

<GroupingSettings IgnorePagingForGroupAggregates="true" />

Enabling it will instruct the grid to include the information from all pages when calculating the group aggregates.
grid grouping groupfooters 2

note

LINQ expressions must be enabled in order for the IgnorePagingForGroupAggregates to have effect. The EnableLinqExpressions property is enabled by default and there is no need to set it to True explicitly.