Question

从Excel导入应用程序，然后使用asp.net mvc和wcf保存在数据库中。由于空字段，它会生成错误。我检查了我的数据库和我的代码，我看到我在那些字段中允许null

请参阅下面的控制器。

控制器

public ActionResult ImportCacExcel(HttpPostedFileBase FileUpload)
{
    List<string> data = new List<string>();
    var bodsList = new List<CAC>();
    if (FileUpload != null)
    {

        HttpPostedFileBase file = Request.Files["FileUpload"];
        if (true)//FileUpload.ContentType == "application/vnd.ms-excel" || FileUpload.ContentType == "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            using (var package = new ExcelPackage(file.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 CAC();

                    bod.RC_NUMBER = workSheet.Cells[rowIterator, 1].Value.ToString();//.ToString().Trim();
                    bod.COMPANY_NAME = workSheet.Cells[rowIterator, 2].Value.ToString();//.ToString().Trim();
                    bod.OWNERSHIP_STRUCTURE = workSheet.Cells[rowIterator, 3].Value.ToString();//.ToString().Trim();    
                    bod.ADDRESS_STREET = workSheet.Cells[rowIterator, 4].Value.ToString();
                    bod.ADDRESS_CITY = workSheet.Cells[rowIterator, 5].Value.ToString();
                    bod.ADDRESS_STATE = workSheet.Cells[rowIterator, 6].Value.ToString();
                    bod.ADDRESS_PMB = workSheet.Cells[rowIterator, 7].Value.ToString();
                    bod.ADDRESS_POBOX = workSheet.Cells[rowIterator, 8].Value.ToString();
                    bod.ADDRESS_LGA = workSheet.Cells[rowIterator, 9].Value.ToString();

                    try
                    {
                        bod.DATE_OF_REGISTRATION = Convert.ToDateTime("01/01/" + workSheet.Cells[rowIterator, 4].Value);//.ToString().Trim();
                    }
                    catch (Exception e)
                    {
                        data.Add("Bad Date format for item at row " + rowIterator);
                    }

                    bod.ACTION_STATUS = 1;
                    bod.CREATED_DATE = DateTime.Now;
                    bodsList.Add(bod);
                }
            }
            foreach (var item in bodsList)
            {
                _cacService.AddCac(item);
            }

            return RedirectToAction("Index");
        }
        else
        { 
            data.Add("<ul>");
            data.Add("<li>Only Excel file format is allowed</li>");
            data.Add("</ul>");
            data.ToArray();
            return Json(data, JsonRequestBehavior.AllowGet);
        }
    }
    else
    {
        data.Add("<ul>");
        if (FileUpload == null) data.Add("<li>Please choose Excel file</li>");
        data.Add("</ul>");
        data.ToArray();
        return Json(data, JsonRequestBehavior.AllowGet);
    }
}

如果像

这样的字段，请如何更改控制器中的代码以ckeck

RC_NUMBER
COMPANY_NAME
OWNERSHIP_STRUCTURE

为空或空，应向用户指示。但如果像

ADDRESS_STREET
ADDRESS_CITY
ADDRESS_STATE
ADDRESS_PMB
ADDRESS_POBOX
ADDRESS_LGA

为null或为空，它应该向excel添加null，并将null保存到数据库。

Answer 1

要应用用户输入验证，因此不允许空值传递。客户端验证，例如使用javascript将是最好的。这可以防止发布表单。这还必须包括控制器中的服务器端验证，以防止客户端验证失败，从而防止程序错误。

if(String.IsNullOrWhiteSpace(workSheet.Cells[rowIterator, 1].Value.ToString())
{
    // Do something to prevent form submission.
}
else
{

    bod.RC_NUMBER = workSheet.Cells[rowIterator, 1].Value.ToString();
}

对于允许为null的所有值。将它们初始化为null可能更简单。然后检查值是否确实为空，如果它们不是，则将该值赋给CAC属性。

bod.ADDRESS_STREET = null;
if(!String.IsNullOrWhiteSpace(workSheet.Cells[rowIterator, 1].Value.ToString())
{
    bod.ADDRESS_STREET = workSheet.Cells[rowIterator, 4].Value.ToString();
}

如何在excel导入中检查空字段

1 个答案: