Issue with custom sorting

[George Saveliev]

Hello!

I have a problem with custom sorting in the latest WinForms RadGridView (2010.2.10.806). It worked well with version 2009.3.9.1203. I use Visual Studio 2008 with .NET 3.5. 

The code snippet is very simple:

01.foreach (GridViewDataColumn column in grid.Columns)
02.    column.CustomDataOperation = CustomDataOperation.Sorting;
03....
04.
05.void grid_CustomSorting(object sender, GridViewCustomSortingEventArgs e)
06.{
07.    MyItem item1 = grid.Rows[e.RowIndex1].DataBoundItem as MyItem;
08.    MyItem item2 = grid.Rows[e.RowIndex2].DataBoundItem as MyItem;
09.    ...
10.}

When the grid column header is clicked, the System.StackOverflowException occurs in grid_CustomSorting at the point where e.RowIndex1 or e.RowIndex2 is accessed. Moreover, it occurs even if we have 

1.void grid_CustomSorting(object sender, GridViewCustomSortingEventArgs e)
2.{
3.    int ind1 = e.RowIndex1;
4.}

The second problem is that e.RowIndex1 can be negative even when the e.CellValue1 contains a good value.

So, how should I sort the grid by underlying data using my custom logic?

Thank you.

[Julian Benkov]

Hello George Saveliev,

The issue with the custom sorting data operation and the RowIndex properties in event args is already known. It will be addressed in our Q2 2010 SP2 release, scheduled for the first half of September.

Currently, you can use reflected rowInfo objects:

void radGridView1_CustomSorting(object sender, GridViewCustomSortingEventArgs e)
{
    FieldInfo fieldInfo = e.GetType().GetField("rowInfo1", BindingFlags.NonPublic | BindingFlags.Instance);
    if (fieldInfo != null)
    {
        GridViewRowInfo row1 = fieldInfo.GetValue(e) as GridViewDataRowInfo;

        fieldInfo = e.GetType().GetField("rowInfo2", BindingFlags.NonPublic | BindingFlags.Instance);
        GridViewRowInfo row2 = fieldInfo.GetValue(e) as GridViewDataRowInfo;

        MyItem item1 = row1.DataBoundItem as MyItem;
        MyItem item2 = row2.DataBoundItem as MyItem;
    }
}

Please excuse us for the caused inconvenience. I hope you find the above workaround helpful. Let me know if I can assist you further.

Sincerely yours,
Julian Benkov
the Telerik team

[George Saveliev]

Thank you for the workaround! It works for me.

JFYI: If the grid is grouped by some column and this column has CustomDataOperation = CustomDataOperation.Sorting, the CustomSorting() handler is called with e.Column = <that grouping column> regardless which column header was clicked.

[Julian Benkov]

Hello George Saveliev,

I am glad to hear that everything works now. Thank you for your comments and the reported issue. Your Telerik points have been updated.

Greetings,

Julian Benkov
the Telerik team