Finding back which column was used to format GridGroupContentCellElement

[Vincent]

Dears,

Despite my investigations on the forums and in my debugger, I didn't find the right way to do what I need.

What I need to do is to change the text present in a GridGroupContentCellElement according to some information present in the column which was selected to create this grouping. Basically cells contain numerical codes as values, but the visual needs to display corresponding labels. This works great with the CellFormatting event but in the ViewCellFormatting, I catch the GridGroupContentCellElement element and then I really wonder how to get back the corresponding column header (at least its Name property).

Do you have any solution for this?

[Stefan]

Hello Vincent,

Thank you for writing.

To get the column name from the GridGroupContentCellElement, you should first access its RowInfo > the Group > the GroupDescriptor > the SortDescriptor and from there the column name (see attached image):

string s = e.CellElement.RowInfo.Group.GroupDescriptor.GroupNames[0].PropertyName;

I hope that you find this information useful.
 
Kind regards,
Stefan
the Telerik team

[Vincent]

It works but now I have another issue : if I click on the group header or expand / collapse the group, it displays the original value and not the label I put.
The most bizarre thing is that the label comes back when I click on another cell.

Screenshot 43 : initial state
Screenshot 44 : group header is selected, the label is replaced by the original value
Screenshot 45 : re-selecting an element gives me back my label

My code is located in the ViewCellFormatting event handler and is this:

if(e.CellElement is GridGroupContentCellElement)
            {
                GridGroupContentCellElement groupCell = e.CellElement as GridGroupContentCellElement;
                if (groupCell.RowInfo.Group.GroupDescriptor.GroupNames.Count > 0)
                {
                    string colName = groupCell.RowInfo.Group.GroupDescriptor.GroupNames[0].PropertyName;
                    if (!string.IsNullOrEmpty(colName) && this.coldescs.ContainsKey(colName))
                    {
                        BOColumn desc = this.coldescs[colName];
                        if (desc.Marker == BOColumnMarker.Property) //routes only if property
                        {
                            if (desc.PropertyDef.TypeDef.IsEnum /*&& groupCell.Tag == null*/) //routes only for enumerations
                            {
                                groupCell.Text = string.Format("{0}: {1}",
                                    _T(string.Format("m_property_{0}", desc.PropertyDef.Name)),

                                    string.IsNullOrEmpty(groupCell.RowInfo.Group.Header) ?
                                    _T("m_Null") :
                                    _T(string.Format("m_{0}_{1}", desc.PropertyDef.TypeDef.Name, groupCell.RowInfo.Group.Header))
                                    );
                               /* groupCell.Tag = desc;*/
                            }
                        }
                    }
                }
            }

[Stefan]

Hi Vincent,

You are right about this case. 

May I please suggest using the GroupSummaryEvaluate event of RadGridView instead:

void radGridView1_GroupSummaryEvaluate(object sender, GroupSummaryEvaluationEventArgs e)
{
    if (e.SummaryItem.Name == "ComboColumn")
    {
        string colName = e.Group.GroupDescriptor.GroupNames[0].PropertyName;
        e.FormatString = colName;
    }
}

More information and examples are available here: http://www.telerik.com/help/winforms/gridview-grouping-formatting-group-header-row.html.

Let me know how this works for you.
 
Kind regards,
Stefan
the Telerik team