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Grouping by a GridViewLookupColumn

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GridView
This is a migrated thread and some comments may be shown as answers.
Nick
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Nick asked on 19 Dec 2008, 02:38 AM
Hi,
I've just started working with WinForms so there may just be something I'm missing here - all of my .NET has been Console, Services and ASP.NET until now.   Working in C#.

So I've got a databound grid with a databound lookup column.  Works great, showing the related column.  The problem is when I drag that column up to group by it, I get the value rather than the display value, i.e.  I get the related key value rather than the text displayed in the column, so when grouping by Section column, instead of this

Section: Test
Section: A new section
Section: Test Section

I get:
Section: 1
Section: 2
Section: 3

Where 1, 2,3 are the corresponding keys for Test, A new Section, Test Section.

I would assume I am missing something easy here as this is pretty basic stuff but I can find nothing on the column about what to display when grouping.

Regards,
Nick H

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Martin Vasilev
Telerik team
answered on 20 Dec 2008, 11:56 AM
Hello Nick,

Thank you for contacting us.

Currently, RadGridView does not support showing the DisplayMember instead of the value when grouping by Combo Column. We will add this functionality in a future release.

You could work-around this by using the GroupSumaryEvaluate event to customize the group header row. Please review the code-block below - it shows how to use the event and extract the needed value from combo box column's data source:
 
void radGridView1_GroupSumaryEvaluate(object sender, GroupSummaryEvaluationEventArgs e)    
{    
    if (e.Value != null)    
    {    
        BindingSource bs = (this.radGridView1.Columns["TerritoryID"]     
            as GridViewLookUpColumn).DataSource as BindingSource;    
        int index = bs.Find("TerritoryID", e.Value);    
        e.FormatString = e.SummaryItem.FieldName + ": " +     
            ((DataRowView)(bs[index])).Row.ItemArray[1];    
    }    
    else    
    {    
        e.FormatString = e.SummaryItem.FieldName + ": \"emty\"";    
    }    
}   

If you have other questions, do not hesitate to contact me again.

Greetings,
Martin Vasilev
the Telerik team

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Martin Vasilev
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