[HttpPost]
       public ActionResult Upload()
       {
           var file = Request.Files[0]; //拿到前端上传的文件
           var Isxls = Path.GetExtension(file.FileName).ToString().ToLower();
           if (Isxls != ".xls" && Isxls != ".xlsx")  //判断文件格式
           {
              return Error();
           }
           if (file == null) { return Error("文件无内容，请检查后重新上传~"); }
           string userId = OperatorProvider.Instance.Current.UserId; //这里是获取当前登录用户的ID 可以不要 我是用来拼接上传后文件的名称
           string virtualPath = Path.Combine("/Content/Uploads/Files", userId + Path.GetExtension(file.FileName));
           string filePath = Request.MapPath(virtualPath);
           if (FileUtil.Exists(filePath))//判断文件是否存在
           {
               FileUtil.Delete(filePath);
           }
           file.SaveAs(filePath);//这里是拿到上传后的文件
           NPOI.XSSF.UserModel.XSSFWorkbook workBook = new NPOI.XSSF.UserModel.XSSFWorkbook(new FileStream(Path.GetFullPath(filePath), FileMode.Open));
           NPOI.XSSF.UserModel.XSSFSheet sheet = (NPOI.XSSF.UserModel.XSSFSheet)workBook.GetSheetAt(0);
           int rowCount = sheet.LastRowNum;
           //开始添加
           for (int j = 0; j < rowCount; j++)
           {
               //获取excel每一行的值
               string Id = Guid.NewGuid().ToString();
               string CreateTime = sheet.GetRow(j + 1).GetCell(0).ToString().Trim().Replace("\n", "；");
               string ClientName = sheet.GetRow(j + 1).GetCell(1).ToString().Trim().Replace("\n", "；");
               //创建需要导入数据的实体类对象
               SysClient model = new SysClient();
               model.Id = Id;
               model.CreateTime = CreateTime ;
               model.ClientName = ClientName;
               clientLogic.Inserts(model);//调用写好的添加接口
           }
           return Success("导入成功！");
       }
      
   }