C# DGV 添加行号以及 背景色 单机列头排序

       //绘制行事件
        private void dgvZQdata_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            Color color = dgvZQdata.RowHeadersDefaultCellStyle.ForeColor;
            if (dgvZQdata.Rows[e.RowIndex].Selected)
                color = dgvZQdata.RowHeadersDefaultCellStyle.SelectionForeColor;
            else
                color = dgvZQdata.RowHeadersDefaultCellStyle.ForeColor;
            this.dgvZQdata.RowsDefaultCellStyle.BackColor = Color.FromArgb(255, 255, 255);
            this.dgvZQdata.AlternatingRowsDefaultCellStyle.BackColor = Color.FromArgb(187, 227, 200);
            this.dgvZQdata.GridColor = Color.FromArgb(208, 255, 255);

            //行序号
            SolidBrush b = new SolidBrush(dgvZQdata.RowHeadersDefaultCellStyle.ForeColor);
            e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture), dgvZQdata.DefaultCellStyle.Font, b, e.RowBounds.Location.X + 10, e.RowBounds.Location.Y + 4);

        }
        
        
        /// <summary>
        /// 排序
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dgvZQdata_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            switch (dgvZQdata.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection)  //获取是否设置了列头显示的符号
            {
                case SortOrder.Descending: