Formated row doesnt anchor on scrolling

[Thomas Schuster]

Hey Folks.

I'm currently stucked on a strange happening.

With the following code i'm formating a row, if cellvalue is changed.

private void gv_data_CellValueChanged(object sender, GridViewCellEventArgs e)
        {
            GridViewRowInfo r = e.Row;
            ((GridCellElement)sender).RowElement.BackColor = Color.LightYellow;
            ((GridCellElement)sender).RowElement.DrawFill = true;
            r.Cells[1].Value = "1";
        }

The BackColor appears to the row. Right so far.
But if im scrolling down then in the DataGridView, the formatting doesn't keep on its row, it's scrolling with.

Just want to highlight edited rows.

Any suggestions?

Kind regards, Tom

[Nick]

Hi Thomas Schuster,

Thank you for contacting us. Visual elements are reused upon scrolling so you cannot set a color to a visual element and expect that it will be connected to a data element in a future moment. What you need to do is to use RowFormatting event as demonstrated in our online documentation. Please read this article and write me back if you are unsure how to implement the scenario.  

Kind regards,
Nick
the Telerik team

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[Thomas Schuster]

Now i used the your suggested method.
Same result, the formatting doesnt keep on its row :(

Here my new Code:

private void gv_data_CellValueChanged(object sender, GridViewCellEventArgs e)
        {
            GridViewRowInfo r = e.Row;
            GridViewColumn c = e.Column;
            xChange = true;
            gv_data_RowFormatting(sender, new RowFormattingEventArgs(((GridCellElement)sender).RowElement));
        }

 private void gv_data_RowFormatting(object sender, RowFormattingEventArgs e)
        {
            if (!xChange) return;
            e.RowElement.BackColor = Color.LightSteelBlue;
            e.RowElement.DrawFill = true;

            xChange = false;
        }

Did this as shown in your Tutorial

Regards, Tom

[Thomas Schuster]

No more ideas?

is there any other way to highlight a row?

Regards, Tom

[Nikolay]

Hello Thomas Schuster,

As my colleague Nick has mentioned, a RowElement is not binded to a data row, so when you scroll up and down you will lose the highlight of the edited rows and this highlight will go to other rows. The important thing is that you should have a condition opposing the 'if' where you should set the BackColor to the default value. In addition, you need to known whether the current data row of a RowElement is a modified row or not. You can use the Tag property of a row to set such flag:

void radGridView1_RowFormatting(object sender, RowFormattingEventArgs e)
{
    if (e.RowElement.RowInfo.Tag != null && e.RowElement.RowInfo.Tag.ToString() == "Modified")
    {
        e.RowElement.BackColor = Color.Red;
        e.RowElement.DrawFill = true;

    }
    else
    {
        if (e.RowElement.BackColor == Color.Red)
        {
            e.RowElement.ResetValue(LightVisualElement.DrawFillProperty);
            e.RowElement.ResetValue(VisualElement.BackColorProperty);
        }
    }
}

void radGridView1_CellValueChanged(object sender, GridViewCellEventArgs e)
{
    GridViewRowInfo r = e.Row;
    r.Tag = "Modified";
}

I hope this helps. If you have additional questions, feel free to contact me.

Regards,
Nikolay
the Telerik team

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