asp.net mvc 使用NPOI插件导出excel

   　　　/// <summary>
         /// 交易账单 导出交易列表
         /// </summary>
         /// <returns></returns>
         public FileResult TranToExcel()
         {
             Dictionary<string, object> ht = new Dictionary<string, object>();
 　　　　　　　//数据源
             List<UserTransactionViewModel> list = UserTransactionBLL.GetTransactionListExcelToAdmin(ht,langId);
             //添加一个sheet
             NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1");
             //给sheet1添加第一行的头部标题
             NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow();
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.TransactionNumber.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.TransactionTitle.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.TransactionUser.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.TransactionType.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.TransactionState.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.PayType.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.TradingCurrency.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.TransactionAmount.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.ExchangeHour.ToLang(langId));
             row1.CreateCell().SetCellValue(UserTransactionLangEnum.Remarks.ToLang(langId));
             //将数据逐步z写入sheet1各个行
             for (int i = ; i < list.Count; i++)
             {
                 NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + );
                 rowtemp.CreateCell().SetCellValue(list[i].Transaction.TranNo);
                 rowtemp.CreateCell().SetCellValue(list[i].Transaction.Trantitle);
                 rowtemp.CreateCell().SetCellValue(list[i].UserName);
                 rowtemp.CreateCell().SetCellValue(Enum.GetName(typeof(TransactionTypeDbEnum), list[i].Transaction.TranTypeId));
                 rowtemp.CreateCell().SetCellValue(Enum.GetName(typeof(StatusDbEnum), list[i].Transaction.StatusId));
                 rowtemp.CreateCell().SetCellValue(Enum.GetName(typeof(PayTypeDbEnum), list[i].Transaction.PayTypeId));
                 rowtemp.CreateCell().SetCellValue(list[i].CurrencyName);
                 rowtemp.CreateCell().SetCellValue(list[i].Transaction.TranAmount.ToString());
                 rowtemp.CreateCell().SetCellValue(list[i].Transaction.Addtime.ToString("yyyy-MM-dd HH:mm:ss"));
                 rowtemp.CreateCell().SetCellValue(list[i].Transaction.Remarks);
             }
             // 写入到客户端
             System.IO.MemoryStream ms = new System.IO.MemoryStream();
             book.Write(ms);
             ms.Seek(, SeekOrigin.Begin);
             string fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + UserTransactionLangEnum.TransactionHistory.ToLang(langId)+ ".xls";
             return File(ms, "application/vnd.ms-excel", fileName);

         }