When is VisualElement set for GridViewRowInfo

[Christopher]

I'm currently using the grid.Rows.Add() method to add a new row when a particular event fires inside my application.

This works fine.

However, I am now trying to set the ForeColor of the row after I add it, but the VisualElement property is null, in the following code sample:

int rowIdx = traysGrid.Rows.Add(
                        tray.TrayID, tray.Barcode,
                        dataContext.Locations.Where(loc => loc.LocationID == trayHistory.LocationID).First().Name
                        ,
                        trayHistory.ArrivalDate,
                        AuthenticationController.GetLoggedInUserName(),
                        tray.Notes
                        );
GridViewDataRowInfo row = traysGrid.Rows[rowIdx];

traysGrid.GridElement.BeginUpdate();
row.VisualElement.BackColor = Color.Green;
traysGrid.GridElement.EndUpdate();

I have used this method successfully when inside a foreach loop, but using it doesn't seem to work as above.

Any advice or ideas?

Thanks

[Jack]

Hi Christopher,

Thank you for this question.

RadGridView uses virtualization of its visual elements. So, only the cells and rows currently visible at the form have a VisualElement. The only place where it is secure to access the VisualElement property is the RowFormatting event. Here is a sample:

void radGridView1_RowFormatting(object sender, RowFormattingEventArgs e)
{
    if (e.RowElement.IsCurrent || e.RowElement.IsSelected)
    {
        e.RowElement.DrawFill = true;
        e.RowElement.BackColor = Color.SkyBlue;
    }
    else if ((int)e.RowElement.RowInfo.Cells[0].Value > 10)
    {
        e.RowElement.BackColor = Color.Green;
        e.RowElement.DrawFill = true;
    }
    else
    {
        e.RowElement.DrawFill = false;
    }
}

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

All the best,
Jack
the Telerik team

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[Alfonsina]

Hello Telerik Team,

I want to set a value to a cell in a GridView like this:

savedRow.Cells["Treffer"].Value = numberHits;

savedRow has the type GridViewRowInfo. The problem hier is that the cell is not setted by the value numberHits. The cell is empty.

How can I solve this problem?

Thanks very much.

Kind regards,

Alfonsina

[Jack]

Hi Alfonsina,

Such an issue may occur when the cell data type is different from numberHits data type and result of the implicit conversion is null. However, I am not able to make precise suggestions without investigating your code. Please, could you send me a sample application where the issue appears and I will try to find a proper solution.

I am looking forward to your reply.
 
Greetings,
Jack
the Telerik team