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GridColumnSummary.Type Property

Gets or sets the aggregation function type. This is a bindable property.

Namespace: DevExpress.Mobile.DataGrid

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

Declaration

[XtraSerializableProperty]
public SummaryType Type { get; set; }
<XtraSerializableProperty>
Public Property Type As SummaryType

Property Value

Type Description
SummaryType

A SummaryType enumeration value that specifies the aggregate function type.

Remarks

Important

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.

Use the Type property to specify which aggregate function should be used to calculate the summary value. There are five predefined aggregate functions for grid data summaries: Sum, Min, Max, Average and Count. To implement your own aggregate function, set the Type property to SummaryType.Custom and handle the GridControl.CalculateCustomSummary event.

Examples

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.

Grid_GettingStarted_Lesson5_Result_iOS

Grid_GettingStarted_Lesson5_Result_Android_Dark

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)
                count++;
            e.TotalValue = count;
        }
    }
}
See Also