Sorting Group header

[Chris Lynch]

How do I sort on a aggragated grouped column 
example if I group and sum on product  sold
how would I sort grouping show top seller in desc order
Please so example in VB

[Martin Vasilev]

Hi Chris Lynch,

Thank you for writing.

If I understand you correctly, you want to apply a custom group sorting, based on summary item values. This scenario is not supported in current version of RadGridView, but the good news is that we will introduce a whole CustomGrouping mechanism, which will allow for implementing your requirement in the upcoming Q3 2010 release.

Let me know if you have any additional questions.

Regards,
Martin Vasilev
the Telerik team

[Chris Lynch]

Martin
Now that Q3 2010 is out can you provide me with an example of how this custom grouping  sorting is done in VB.net
Chris

[Julian Benkov]

Hi Chris Lynch,

There is an example demonstrating how custom grouping works in our demo application. Please check the RadGridView - Grouping section. However, currently the custom groups sorting feature is not available. We plan to include this functionality in our upcoming service pack - Q3 2010 SP1.

Should you have any other questions, please do not hesitate to write back.

Sincerely yours,
Julian Benkov
the Telerik team

[Bernd]

Hello,

is the Group sorting feature available in the 2011.Q2 release?

Regards, Bernd

[Julian Benkov]

Hi Bernd,

To change the order of your Groups using custom grouping, you must implement your own generic Group comparer and change the default one. Here is a simple example:

public class GroupComparer : IComparer<Group<GridViewRowInfo>>
{
    public int Compare(Group<GridViewRowInfo> x, Group<GridViewRowInfo> y)
    {
        return x.Key.GetHashCode().CompareTo(y.Key.GetHashCode());
    }
}

public GridForm1()
{
    InitializeComponent();

    this.radGridView1.MasterTemplate.GroupComparer = new GroupComparer();
}

I hope this helps. 

Best wishes,
Julian Benkov
the Telerik team

[Bernd]

Hi Julian,

yes that helps.
Thank you very much!

Regards, Bernd