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GridControl.CalculateCustomSummary Event

Allows you to calculate summary values manually.

Namespace: DevExpress.Mobile.DataGrid

Assembly: DevExpress.Mobile.Grid.v18.2.dll


public event CustomSummaryEventHandler CalculateCustomSummary
Public Event CalculateCustomSummary As CustomSummaryEventHandler


Total and group summaries provide five predefined aggregate functions (Count, Max, Min, Sum and Average). To calculate a summary value using a custom rule, set the summary item's GridColumnSummary.Type property to SummaryType.Custom, and handle the CalculateCustomSummary event.

The CalculateCustomSummary event fires for each data row involved in summary calculation. When calculating a total summary value, the event is raised for each data row. When calculating a group summary value, this event fires for each data row within a group. To enable you to perform any initialization and finalization, the event is also raised before and after processing rows.

The summary calculation consists of the three stages.

To skip the Calculation stage and calculate a custom summary at the Initialization or Finalization stage, set the event parameter's CustomSummaryEventArgs.TotalValueReady property to true at the Initialization stage. This automatically skips the Calculation stage and the Finalization stage starts immediately.


This example shows how to use the GridControl.CalculateCustomSummary event to create a custom summary that counts the total number of data rows whose cells in the Shipped column (SwitchColumn) contain false.

    <dxGrid:GridColumnSummary FieldName="Total" Type="Sum" 
                            DisplayFormat= "Total: {0:C0}"/>
    <dxGrid:GridColumnSummary FieldName="Shipped" Type="Custom" 
                            DisplayFormat= "Not Shipped: {0}"/>
See Also