DataGridView 添加行号

 private void dataGridViewX1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            //DataGridViewX dgv = sender as DataGridViewX;
            //System.Drawing.Rectangle rectangle = new System.Drawing.Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y, dgv.RowHeadersWidth - 4, e.RowBounds.Height);
            //TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), dgv.RowHeadersDefaultCellStyle.Font, rectangle, dgv.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
        }