dataGridView前加自动排序的序号

  private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
             e.RowBounds.Location.Y,
             dataGridView1.RowHeadersWidth - 4,
             e.RowBounds.Height);

            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
              dataGridView1.RowHeadersDefaultCellStyle.Font,
              rectangle,
              dataGridView1.RowHeadersDefaultCellStyle.ForeColor,
              TextFormatFlags.VerticalCenter | TextFormatFlags.Right);

        }

方式二：现在表中添加序号列，放到第一列中

  private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {

  foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                row.Cells[0].Value = row.Index + 1;
            }
}