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      How to: Implement Custom Summary
      How To: Display Custom Summary in Totals
      How to: Add Custom Totals
      How to: Calculate Multiple Custom Totals with Custom Summary Type
      How to: Locate a Column (Row) Header By Its Column's (Row's) Summary Values
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View this topic on docs.devexpress.com (Learn more)

How to: Implement Custom Summary

This example demonstrates how to calculate a custom summary to display the distinct value count.

When the control calculates the summary value for the field whose SummaryType (see PivotGridFieldBase.SummaryType) is PivotSummaryType.Custom, the PivotGridControl.CustomSummary event occurs. The event handler calls the PivotGridCustomSummaryEventArgsBase<T>.CreateDrillDownDataSource method to retrieve the underlying data rows for the current cell, counts distinct values and returns the result to the PivotGridCustomSummaryEventArgsBase<T>.CustomValue property.

Note

The complete sample project How to Create a Custom Summary Type to Display the Distinct Value Count is available in the DevExpress Examples repository.

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