爲datagridView添加行號

        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);

            }

       

        }