GridControl.GroupSummaries Property

Provides access to group summary items.

Namespace: DevExpress.Mobile.DataGrid

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


[XtraSerializableProperty(XtraSerializationVisibility.Collection, true, false, true)]
public ObservableCollection<GridColumnSummary> GroupSummaries { get; }
<XtraSerializableProperty(XtraSerializationVisibility.Collection, True, False, True)>
Public ReadOnly Property GroupSummaries As ObservableCollection(Of GridColumnSummary)

Property Value

Type Description

A collection of group summary items.



This documentation topic describes legacy technology. We no longer develop new functionality for the GridControl and suggest that you use the new DataGridView control instead.

Group summaries are displayed within group rows when data grouping is applied in the grid. Group summary items are specified by the GridColumnSummary objects and are stored within the GroupSummaries collection. This collection provides methods and properties allowing you to add, remove and access summary items.

The collection of total summaries can be accessed using the GridControl.TotalSummaries property.


This example shows how to calculate group and total summaries for grid columns using predefined aggregate functions or a custom rule.

The following data summaries are created.

  • Group summary to display the maximum value in a Total column for each group of records.
  • Total summary to calculate the sum of values by the whole Total column.
  • Custom total summary to count the number of rows whose value in the Shipped column is false.



void OnCalculateCustomSummary(object sender, CustomSummaryEventArgs e) {
    if (e.FieldName.ToString () == "Shipped")
    if (e.IsTotalSummary){
        if (e.SummaryProcess == CustomSummaryProcess.Start) {
            count = 0;
        if (e.SummaryProcess == CustomSummaryProcess.Calculate) {
            if (!(bool)e.FieldValue)
            e.TotalValue = count;
See Also