GridControl通用导出Excel

#region 导出
        /// <summary>
        /// DevExpress通用导出Excel,支持多个控件同时导出在同一个Sheet表
        /// eg:ExportToXlsx("",gridControl1,gridControl2);
        /// 将gridControl1和gridControl2的数据一同导出到同一张工作表
        /// </summary>
        /// <param name="title">文件名</param>
        /// <param name="panels">控件集</param>
        public void ExportToExcel(params IPrintable[] panels)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.FileName = "Export Excel";
            saveFileDialog.Title = "导出Excel";
            saveFileDialog.Filter = "Excel文件(*.xlsx)|*.xlsx|Excel文件(*.xls)|*.xls";
            DialogResult dialogResult = saveFileDialog.ShowDialog();
            if (dialogResult == DialogResult.Cancel)
                return;
            string FileName = saveFileDialog.FileName;
            PrintingSystem ps = new PrintingSystem();
            CompositeLink link = new CompositeLink(ps);
            ps.Links.Add(link);
            foreach (IPrintable panel in panels)
            {
                link.Links.Add(CreatePrintableLink(panel));
            }
            link.Landscape = true;//横向          
            //判断是否有标题，有则设置        
            //link.CreateDocument(); //建立文档
            try
            {