Winform中的DatagridView显示行号

1、设置 RowPostPaint 为true

2、启用RowPostPaint事件

  　　　　/// <summary>
        /// DataGridView显示行号
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dataGridWebConfigView_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            string strRowNumber = (e.RowIndex + 1).ToString();
            while (strRowNumber.Length < dataGridWebConfigView.RowCount.ToString().Length) strRowNumber = "0" + strRowNumber;
            SizeF size = e.Graphics.MeasureString(strRowNumber, this.Font);
            if (dataGridWebConfigView.RowHeadersWidth < (int)(size.Width + 20)) dataGridWebConfigView.RowHeadersWidth = (int)(size.Width + 20);

            Brush b = SystemBrushes.ControlText;
            e.Graphics.DrawString(strRowNumber, this.Font, b, e.RowBounds.Location.X + 15, e.RowBounds.Location.Y + ((e.RowBounds.Height - size.Height) / 2));
        }