C# 使用EF&；更新数据库中的图像；MVC

我在数据库中上传和显示的图像可以正常工作，但当我尝试更新图像时，总是会出现错误。它给出一个错误：“对象引用未设置为对象的实例。”

代码如下：

[HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "StoreID,CustomerID,StoreName,StoreUID,StoreNumber,StoreLogo,StoreLogoPath,StoreAddress,StoreCity,StoreRegion,StoreCountry")] Store store, HttpPostedFileBase file)
    {
        if (ModelState.IsValid)
        {
            if (file != null)
            {
                string ImageName = System.IO.Path.GetFileName(file.FileName);
                string physicalPath = Server.MapPath("~/Images/" + ImageName);

                file.SaveAs(physicalPath);

                store.StoreLogoPath = Request.Form["StoreLogoPath"];
                store.StoreLogo = ImageName;

                db.Stores.Add(store);
                db.SaveChanges();
            }

            return RedirectToAction("Index");

        }


        ViewBag.CustomerID = new SelectList(db.Customers, "CustomerID", "CustomerCompanyName", store.CustomerID);

        return View(store);
    }


 public ActionResult Edit(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Store store = db.Stores.Find(id);
        if (store == null)
        {
            return HttpNotFound();
        }
        ViewBag.CustomerID = new SelectList(db.Customers, "CustomerID", "CustomerCompanyName", store.CustomerID);
        return View(store);
    }

    // POST: Stores/Edit/5

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Edit([Bind(Include = "StoreID,CustomerID,StoreName,StoreUID,StoreNumber,StoreLogo,StoreLogoPath,StoreAddress,StoreCity,StoreRegion,StoreCountry")] Store store, HttpPostedFileBase file)
    {
        if (ModelState.IsValid)
        {
            string ImageName = System.IO.Path.GetFileName(file.FileName);
            string physicalPath = Server.MapPath("~/Images/" + ImageName);

            file.SaveAs(physicalPath);

            store.StoreLogoPath = Request.Form["StoreLogoPath"];
            store.StoreLogo = ImageName;
            db.Entry(store).State = EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        ViewBag.CustomerID = new SelectList(db.Customers, "CustomerID", "CustomerCompanyName", store.CustomerID);
        return View(store);
    }

编辑视图

@使用（Html.BeginForm（新的{enctype=“multipart/form data”}））
{
商店标志
@Html.ValidationMessageFor（model=>model.StoreLogo，“，new{@class=“text danger”}）
}

从何处获得该错误？在编辑代码的这一行-字符串ImageName=System.IO.Path.GetFileName（file.FileName）；

FileName

的值是多少？它只是检索上载图像的实际文件名。请调试并找出保存在

FileName

中的特定值。我想，

文件

设置不正确