TreeListView.CustomSummary Event

Enables you to calculate summary values manually.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v21.1.dll


public event TreeListCustomSummaryEventHandler CustomSummary

Event Data

The CustomSummary event's data class is TreeListCustomSummaryEventArgs. The following properties provide information specific to this event:

Property Description
FieldValue Gets the processed field value.
IsNodeSummary Gets whether the processed row values are used to calculate a node summary.
IsTotalSummary Gets whether the processed row values are used to calculate a total summary.
IsTotalValueReady Gets or sets whether the Calculation stage of the custom summary calculation process should be skipped.
Node Gets the processed node.
SummaryItem Gets a summary item whose value is being calculated.
SummaryProcess Gets a value indicating the calculation stage.
TotalValue Gets or sets the total summary value.


Total summaries provides five predefined aggregate functions (COUNT, MAX, MIN, SUM and AVG). If you want to calculate summaries using custom rules, handle the CustomSummary event. This event enables you to implement custom aggregate functions or calculate summary values, using a custom algorithm.

If you want to maintain a clean MVVM pattern and specify custom summaries in a View Model, create a command and bind it to the CustomSummaryCommand property.

Refer to the following help topic for more information: Custom Summary.

See Also