ListExcel导出(加载模板)

 /// <summary>
         /// List根据模板导出ExcelMemoryStream
         /// </summary>
         /// <param name="list"></param>
         /// <param name="templdateName"></param>
         public static MemoryStream ExportListByTempale(List<TemplateMode> list, string templdateName)
         {
             try
             {                 string templatePath = HttpContext.Current.Server.MapPath("/") + "/Resource/ExcelTemplate/";
                 string templdateName1 = string.Format("{0}{1}", templatePath, templdateName);                 FileStream fileStream = new FileStream(templdateName1, FileMode.Open, FileAccess.Read);
                 ISheet sheet = null;
                 if (templdateName.IndexOf(".xlsx") == -)//
                 {
                     HSSFWorkbook hssfworkbook = new HSSFWorkbook(fileStream);
                     sheet = hssfworkbook.GetSheetAt();
                     SetPurchaseOrder(sheet, list);
                     sheet.ForceFormulaRecalculation = true;
                     using (MemoryStream ms = new MemoryStream())
                     {
                         hssfworkbook.Write(ms);
                         ms.Flush();
                         return ms;
                     }
                 }
                 else//
                 {
                     XSSFWorkbook xssfworkbook = new XSSFWorkbook(fileStream);
                     sheet = xssfworkbook.GetSheetAt();
                     SetPurchaseOrder(sheet, list);
                     sheet.ForceFormulaRecalculation = true;
                     using (MemoryStream ms = new MemoryStream())
                     {
                         xssfworkbook.Write(ms);
                         ms.Flush();
                         return ms;
                     }
                 }             }
             catch (Exception)
             {
                 throw;
             }
         }
         /// <summary>
         /// 赋值单元格
         /// </summary>
         /// <param name="sheet"></param>
         /// <param name="list"></param>
         private static void SetPurchaseOrder(ISheet sheet, List<TemplateMode> list)
         {
             try
             {
                 foreach (var item in list)
                 {
                     IRow row = null;
                     ICell cell = null;
                     row = sheet.GetRow(item.row);
                     if (row == null)
                     {
                         row = sheet.CreateRow(item.row);
                     }
                     cell = row.GetCell(item.cell);
                     if (cell == null)
                     {
                         cell = row.CreateCell(item.cell);
                     }
                     cell.SetCellValue(item.value);
                 }
             }
             catch (Exception)
             {
                 throw;
             }
         }
         #endregion