Column group aggregates don't show for custom group descriptor

[Dom]

Hi,

I've been using custom Group Descriptors on my RadGridView so I can specify the order the groups are sorted into however on these custom groups, (an example of how I create the descriptor is below), the column aggregates do not show. But if I do not override the group descriptor the column aggregates show on the row groups correctly. Is it possible for me to show these aggregate values on my custom groups?

Thanks for your help!!

01.private GroupDescriptor<PnlPosition, string, DateTime> GetInstrumentIdGroupDescriptor(ListSortDirection dir)
02.        {
03.            var descriptor = new GroupDescriptor<PnlPosition, string, DateTime>
04.            {
05.                GroupingExpression = o => o.InstrumentId.ToString(),
06.                GroupSortingExpression = group => group.ElementAt(0).Expiry.Value,
07.                SortDirection = dir,
08.                DisplayContent = "InstrumentId",
09.            };
10.            return descriptor;
11.        }
12.
13.        private void PositionResultsGridView_Grouping(object sender, Telerik.Windows.Controls.GridViewGroupingEventArgs e)
14.        {
15.            if (e.Action == GroupingEventAction.Place)
16.            {
17.                var columnGroup = e.GroupDescriptor as ColumnGroupDescriptor;
18.                if (columnGroup != null && columnGroup.Column.UniqueName == "InstrumentId")
19.                {
20.                    // cancel the default grouping
21.                    e.Cancel = true;
22.                    var descriptor = GetInstrumentIdGroupDescriptor(e.GroupDescriptor.SortDirection ?? ListSortDirection.Descending);
23.
24.                    //descriptor.AggregateFunctions = columnGroup.A
25.                    // add the new descriptor
26.                    ((RadGridView)sender).GroupDescriptors.Add(descriptor);
27.                }
28.                else if (columnGroup != null && columnGroup.Column.UniqueName == "Underlying")
29.                {
30.                    // cancel the default grouping
31.                    e.Cancel = true;
32.                    // add the new descriptor
33.                    var descriptor = GetUnderlyingGroupDescriptor(e.GroupDescriptor.SortDirection ?? ListSortDirection.Descending);
34.                    ((RadGridView)sender).GroupDescriptors.Add(descriptor);
35.                }
36.            }
37.        }

 

 

[Dom]

Any help would be really appreciated :D 

[Vladimir Stoyanov]

Hello Dom,

Thank you for the provided picture and sample code. 

When an aggregate function is defined for a column, it will be displayed on creating a ColumnGroupDescriptor. This happens when the RadGridView is grouped from the UI. In your scenario, I can suggest utilizing the AggregateFunctions property of the GroupDescriptor. 

I am attaching a sample project to demonstrate what I have in mind. Please, check it out and let me know, if you find it helpful. 

Regards,
Vladimir Stoyanov
Progress Telerik