为datagridView添加行号

private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)

{

Color color = dataGridView1.RowHeadersDefaultCellStyle.ForeColor;

if (dataGridView1.Rows[e.RowIndex].Selected)

color = dataGridView1.RowHeadersDefaultCellStyle.SelectionForeColor;

else

color = dataGridView1.RowHeadersDefaultCellStyle.ForeColor;

using (SolidBrush b = new SolidBrush(color))

{

e.Graphics.DrawString((e.RowIndex+1).ToString(), e.InheritedRowStyle.Font, b, e.RowBounds.Location.X+20, e.RowBounds.Location.Y+6);

}

}