Excel批量导入商品，遇到导入失败记录到另一个Excel中供下载查看

 /// <summary>
         ///     EXCEL批量导入
         /// </summary>
         /// <param name="filePath">文件路径</param>
         /// <param name="shop">店铺</param>
         /// <returns></returns>
         public string BatchUploadProduct(string filePath, Web_Shop shop)
         {
             #region 创建一个用于记录错误的新Excel

             var workbook = new HSSFWorkbook();
             ISheet sheet0 = workbook.CreateSheet("sheet1");
             IRow rows = sheet0.CreateRow();
             rows.CreateCell().SetCellValue("分类ID");
             rows.CreateCell().SetCellValue("商品名称");
             rows.CreateCell().SetCellValue("售价");
             rows.CreateCell().SetCellValue("简单描述");
             rows.CreateCell().SetCellValue("重量");
             rows.CreateCell().SetCellValue("单位");
             rows.CreateCell().SetCellValue("现购库存");
             rows.CreateCell().SetCellValue("供应类型");
             rows.CreateCell().SetCellValue("收获时间");
             rows.CreateCell().SetCellValue("订购库存");
             rows.CreateCell().SetCellValue("错误消息");

             #endregion

             try
             {
                 using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                 {
                     var book = new HSSFWorkbook(stream); //读出来用户上传的Excel
                     ISheet sheet = book.GetSheetAt(); //拿到Excel中的第一个sheet
                     int rowCount = sheet.LastRowNum; //拿到sheet的行数
                     int errorCount = ;
                     for (int i = sheet.FirstRowNum + ; i < rowCount; i++)
                     {
                         IRow row = sheet.GetRow(i);
                         //row2.CreateCell(10).SetCellValue(row.GetCell(10).ToString());

                         #region 中间变量

                         string errMsg = string.Empty;
                         bool error = false;
                         int categoryId;
                         string proName;
                         decimal marketPrice;
                         string shortContent;
                         int weight;
                         string unit;
                         int storage; //现购库存
                         int canSupply; //可订购数量
                         int supplyType; //供应类型
                         DateTime harvestTime; //收获时间 

                         #endregion

                         var pro = new Web_Product();

                         #region 检测数据合法性

                         if (!int.TryParse(row.GetCell().ToString(), out categoryId))
                         {
                             errMsg = "商品类型错误";
                             error = true;
                         }
                         proName = row.GetCell().ToString();
                         if (string.IsNullOrEmpty(proName))
                         {
                             errMsg = errMsg + ",商品名称不能为空";
                             error = true;
                         }

                         if (!decimal.TryParse(row.GetCell().ToString(), out marketPrice))
                         {
                             errMsg = errMsg + ",商品价格错误";
                             error = true;
                         }
                         shortContent = row.GetCell().ToString();
                         if (string.IsNullOrEmpty(shortContent))
                         {
                             errMsg = errMsg + ",商品描述不能为空";
                             error = true;
                         }
                         if (!int.TryParse(row.GetCell().ToString(), out weight))
                         {
                             errMsg = errMsg + ",商品重量错误";
                             error = true;
                         }
                         unit = row.GetCell().ToString();
                         if (string.IsNullOrEmpty(unit))
                         {
                             errMsg = errMsg + ",商品单位错误";
                             error = true;
                         }

                         if (!int.TryParse(row.GetCell().ToString(), out storage))
                         {
                             errMsg = errMsg + ",商品现购库存错误";
                             error = true;
                         }
                         if (!int.TryParse(row.GetCell().ToString(), out supplyType))
                         {
                             errMsg = errMsg + ",商品供应类型错误";
                             error = true;
                         }
                         if (!DateTime.TryParse(row.GetCell().DateCellValue.ToString("yyyy-MM-dd"), out harvestTime))
                         {
                             errMsg = errMsg + ",商品收获时间错误";
                             error = true;
                         }
                         if (!int.TryParse(row.GetCell().ToString(), out canSupply))
                         {
                             errMsg = errMsg + ",商品订购库存错误";
                             error = true;
                         }

                         #endregion

                         #region 如果有错误，就把这一行给添加到新的Excel中

                         if (error)
                         {
                             IRow row2 = sheet0.CreateRow(sheet0.LastRowNum + );
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(row.GetCell().ToString());
                             row2.CreateCell().SetCellValue(errMsg);
                             errorCount += ;
                         }

                         #endregion

                         #region 如果没有错误，把产品添加到数据库

                         if (!error)
                         {
                             pro.Name = proName.TagReplace();
                             pro.MarketPrice = marketPrice;
                             pro.ShortContent = shortContent.TagReplace();
                             pro.Weight = weight;
                             pro.Unit = unit.TagReplace();
                             pro.Storage = storage;
                             pro.CanSupply = canSupply;
                             pro.CategoryID = categoryId;
                             pro.IsValidate = ; //默认这个产品是没有经过验证的，不让它上架
                             if (supplyType != ) //只要不等于100，默认都给200
                             {
                                 supplyType = ;
                             }
                             pro.SupplyType = supplyType;
                             pro.ShopID = shop.ID;
                             pro.HarvestTime = harvestTime;
                             AddProduct(pro);
                         }

                         #endregion
                     }
                     string savePath = VirtualPaths.ErrorExcelSavePath + "/" + GetProductrNumberByDate() + ".xls";
                         //生成错误Excel的文件
                     if (errorCount > ) //如果总的错误个数大于0，就吧错误的Excel写到文件中，否则不写。
                     {
                         using (var fs = new FileStream(savePath, FileMode.Create))
                         {
                             workbook.Write(fs); //保存
                         }
                         return savePath; //返回路径供下载
                     }
                     return "ok"; //表示上传成功，没有错误
                 }
             }
             catch
             {
                 return "上传失败，请重试"; //遇到的未知的错误
             }
         }

DAL层