Get Selected Row Fails When Using Drag-n-Drop GroupBy

[Michael Semanson]

Using the following Event Handler for RadGrid SelectionChanged, I have been able to successfully extract a value from the selected row and pass it through as a parameter to a stored procedure when the grid is in a normal (non groupby) situation.

However, as soon as a a column header is drag-n-dropped into the GroupBy region of the grid, the function is unable to properly extract the needed value.

        private void radASNMaster_SelectionChanged(object sender, SelectionChangeEventArgs e)
        {
            bool columnFound = false;
            try
            {
                radDetailsView.IsBusy = true;

                // Get the selected row so we can extract the AsnInMasterID value and pass it into the Stored Procedure
                var selectedRow = e.AddedItems[0];
                var selectedUIRow = radASNMaster.ItemContainerGenerator.ContainerFromItem(selectedRow) as Telerik.Windows.Controls.GridView.GridViewRow;
                // Columns could have been reordered by user so we need to step through available columns and look for AsnInMasterID.
                for (int columnIndex = 0; (columnIndex < selectedUIRow.Cells.Count) && !columnFound; columnIndex++)
                {
                    var asnMasterIDCell = selectedUIRow.Cells[columnIndex] as Telerik.Windows.Controls.GridView.GridViewCell;
                    if (asnMasterIDCell.Column.Header.ToString() == "AsnInMasterID")
                    {
                        // We found our column.  Extract the AsnInMasterID value and pass it into the stored procedure.
                        var proxy = new CACrossDockSvc.CACrossDockServiceClient();

                        proxy.GetASNDetailsByMasterIDCompleted += new EventHandler<CAXDock.CACrossDockSvc.GetASNDetailsByMasterIDCompletedEventArgs>(proxy_GetASNDetailsByMasterIDCompleted);

                        proxy.GetASNDetailsByMasterIDAsync(Convert.ToInt32(asnMasterIDCell.Value.ToString()));

                        columnFound = true;
                    }
                }
                if (!columnFound)
                    throw new Exception("ColumnNotFound");
            }
            catch
            {
                radDetailsView.ItemsSource = null;
                radDetailsView.IsBusy = false;
            }
        }

Specifically, when the grid is GroupedBy any column and the user selects a row, the above function executes but the line 

"var selectedUIRow = radASNMaster.ItemContainerGenerator.ContainerFromItem(selectedRow) as Telerik.Windows.Controls.GridView.GridViewRow;" returns null for selectedUIRow.  Obviously, the rest of the function fails to work properly because of the null value.

One last piece of information I can provide is that I recently (today) upgrade the Telerik Silverlight controls to Q1 2010 from Q3 2009, and I'm pretty sure this worked properly with the older release.

What do I need to do to get this to work?

Thank you,

Michael

[Michael Semanson]

Is anyone from Telerik looking at this?

[Milan]

Hello Michael Semanson,

Currently this is expected since ItemsContainerGenerator cannot return row containers when RadGridView is grouped. but you could take another approach. Instead of using the UI elements to get the data you can get the needed data from the data items themselves. 

var selectedItem = e.AddedItems[0];
// cast the selected item to the expected data item type
var selectedDataItem = (MyDataType)selectedItem;
// once we have casted to the expected type we can extract the needed property values
var neededPropertyValue = selectedDataItem.MasterID;

Hope this helps.

All the best,
Milan
the Telerik team

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