How to: Lock Grouping Column ?

[Mark]

I have the need to lock a grouped column... in other words, to not allow the user to close (un-group) the selected column.  Is this possible?

Take for instance grouping by the demo column "Title".  I do not want to also then display the "Title" column seeing that it is now shown in the group.  However, if you hid the "Title" column, and then programmatically group by that column... and then if the user closes that group - Oops! No "Title" column shown to re-group by later.

Thanks!

[Adam Marshall]

I needed the same functionality as you have mentioned too.

I used the "Grouping" event on the RadGridView and used the code behind to Cancel the close when it was clicked.

private void grid1_Grouping(object sender, GridViewGroupingEventArgs e)
        {
            //cancel remove grouping on groupColumnName
            if (e.Action == System.ComponentModel.CollectionChangeAction.Remove && e.GroupDescriptor.DisplayContent.ToString() == "groupColumnName")
            {
                e.Cancel = true;
            }
        }

If there is a better way of doing this, I would love to know!

[Mark]

Fantastic!  That'll work... thanks for the help.

[Adam Marshall]

This no longer works with the 2010 Q3 controls.

Modified code to cancel a "Grouping Close/Remove"

private void grid1_Grouping(object sender, GridViewGroupingEventArgs e)

        {

              

            //cancel remove grouping
            if (e.Action == GroupingEventAction.Remove && ((Telerik.Windows.Data.GroupDescriptor)e.GroupDescriptor).Member == "YourGroupDescriptorMemberName")

            {

                e.Cancel = true;

            }

        }

[Vanya Pavlova]

Hello Adam,

We introduced breaking changes in Q3 2010, please see them here.

Your code should look like this:

private void grid1_Grouping(object sender, GridViewGroupingEventArgs e)
{
      //cancel remove grouping
     if (e.Action == GroupingEventAction.Remove &&
         ((e.GroupDescriptor as ColumnGroupDescriptor).Column as GridViewDataColumn).DataMemberBinding.Path.Path == "YourGroupDescriptorMemberName")
     {
           e.Cancel = true;
     }
}

 

Hope this helps.

Best wishes,
Vanya Pavlova
the Telerik team