Question

我上传Excel文件并使用ASP.NET MVC保存到我的数据库中。我成功了：

导入Excel文件
保存到数据库

请参阅下面的控制器

控制器

        public ActionResult ImportCountriesExcel(HttpPostedFileBase FileUpload)
    {
        string data = "";
        var notif = new UINotificationViewModel()
        {
            notif_message = "Record Saved successfully",
            notif_type = NotificationType.SUCCESS,
        };
        var bodsList = new List<COUNTRIES>();
        if (FileUpload != null)
        {
            // tdata.ExecuteCommand("truncate table OtherCompanyAssets");  
            HttpPostedFileBase file = Request.Files["FileUpload"];
            if (true)//FileUpload.ContentType == "application/vnd.ms-excel" || FileUpload.ContentType == "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
            {
                try { 
                string message = "";
                using (var package = new ExcelPackage(FileUpload.InputStream))
                {
                    var currentSheet = package.Workbook.Worksheets;
                    // if(currentSheet.Count)
                    var workSheet = currentSheet.First();
                    var noOfCol = workSheet.Dimension.End.Column;
                    var noOfRow = workSheet.Dimension.End.Row;
                    for (int rowIterator = 2; rowIterator <= noOfRow; rowIterator++)
                    {
                            var bod = new COUNTRIES();
                            bod.COUNTRY_CODE = Convert.ToString(workSheet.Cells[rowIterator, 1].Value);
                            if (bod.COUNTRY_CODE == "")
                                message += "<li> Country Code is empty at row " + rowIterator + "</li>";
                            bod.COUNTRY_NAME = Convert.ToString(workSheet.Cells[rowIterator, 2].Value);
                            if (bod.COUNTRY_NAME == "")
                                message += "<li> Country Name is empty at row " + rowIterator + "</li>";
                            if (bod.COUNTRY_DESC == "")
                                message += "<li> Country Desc is empty at row " + rowIterator + "</li>";
                            bodsList.Add(bod);
                    }
                }
                foreach (var item in bodsList)
                {
                    _countriesService.AddCountry(item);
                }
                return RedirectToAction("Index");
            }
                catch (Exception e)
                {
                    notif.notif_message = "Application error, Contact the Administrator";
                    notif.notif_type = NotificationType.ERROR;
                }
                TempData["notif"] = notif;
                return RedirectToAction("Index");
            }
            else
            {
                notif.notif_type = NotificationType.ERROR;
                //alert message for invalid file format  
                data += "<ul>";
                data += "<li>Only Excel file format is allowed</li>";
                data += "</ul>";
                notif.notif_message = data;
                TempData["notif"] = notif;
                return RedirectToAction("Index");
                //return Json(data, JsonRequestBehavior.AllowGet);
            }
        }
        else
        {
            data += "<ul>";
            if (FileUpload == null) data += "<li>Please choose Excel file</li>";
            data += "</ul>";
            notif.notif_message = data;
            TempData["notif"] = notif;
            return RedirectToAction("Index");
            //return Json(data, JsonRequestBehavior.AllowGet);
        }
    }

我遇到的问题是这个

部分导入有空格
允许重复

我该怎么做：

使用修剪
每当有重复项（如果该记录已存在），则应根据COUNTRY_CODE和COUNTRY_NAME进行过滤。然后系统应该应该已经存在的记录列表。它将询问用户他想要更新或允许复制的用户。

Answer 1

为防止重复，您可以从数据库中读取所有现有项目并将其存储在字典中，并在迭代excel行中的每个项目时，检查字典是否存在，如果不存在则添加到数据库中并添加到字典中。

var countryDict=db.Countries.ToDictionary(a => a.Code, a => a.Name);
var duplicateItems = new List<string>();

//your existing code goes here
for (int rowIterator = 2; rowIterator <= noOfRow; rowIterator++)
{
   var countryCode = "Read this from the excel cell";
   var countryName = "Read this from the excel cell";

   if (countryDict.ContainsKey(countryCode))
   {
      duplicateItems.Add(countryCode);
   }
   else
   {
       countryDict.Add(countryCode,countryName);
      //existing code to save
   }
}
if(duplicateItems.Any()
{
   //This means duplicates exist
}

修剪只是一种方法，你可以调用字符串来删除前导和尾随空格。确保你没有在NULL上调用它。

var trimmedValue= someStringVariableWhichCouldBeNull?.Trim();

ASP.NET MVC - 如何处理Excel上载中的重复

1 个答案: