(DataGridView + Binding)How to color line depending of the object binded?

Question

I would like to add a backcolor for specific line depending of a Property of the object binded.

The solution I have (and it works) is to use the Event DataBindingComplete but I do not think it's the best solution.

Here is the event:

    private void myGrid_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
    {

        for (int i = 0; i < this.myGrid.Rows.Count; i++)
        {
            if((this.myGrid.Rows[i].DataBoundItem as MyObject).Special)
            {
                this.myGrid.Rows[i].DefaultCellStyle.BackColor = Color.FromArgb(240, 128, 128);
            }
        }
    }

Any other option that would be better?

Answer 1

You can also attach an event handler to RowPostPaint:

dataGridView1.RowPostPaint += OnRowPostPaint;

void OnRowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
    MyObject value = (MyObject) dataGridView1.Rows[e.RowIndex].DataBoundItem;
    DataGridViewCellStyle style = dataGridView1.Rows[e.RowIndex].DefaultCellStyle;

    // Do whatever you want with style and value
    ....
}

Answer 2

I don't really work with WinForms that much, but in ASP you would use the 'ItemDataBound' method. Is there something similar in windows forms for a DataGrid?

If so, in that method, the event arguments would contain the item that was databound, along with the DataGrid row. So the general code would look something like this (syntax is probably off):

if(((MyObject)e.Item.DataItem).Special)
   e.Item.DefaultCellStyle.BackColor = Color.FromArgb(240, 128, 128);

Answer 3

I would suggest a few things:

• look at modifying your rows at _OnRowDatabound
• Do not set color in your code!!! This would be a big mistake. Use the attributes property and set the cssclass. Wag of the finger to people still doing this.

Let me know if you struggle with the implementation and i'll post a snippet.

Answer 4

private void myGrid_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{

    foreach (DataGridViewRow row in myGrid.Rows)
    {
        if((row.DataBoundItem as MyObject).Special)
        {
            row.DefaultCellStyle.BackColor = Color.FromArgb(240, 128, 128);
        }
    }
}