导出Excel

 public FileResult Export(string queryJson)
        {
           

            string filename = DateTime.Now.ToString("yyyyMMdd") + ".xls";
            byte[] excel = new EME.Code.Excel.NPOIExcel().DataTableToExcel(dt, DateTime.Now.ToString("yyyyMMdd"));
            return File(excel, "application/vnd.ms-excel", filename);
            
        }