MVC4 - Ajax.ActionLink()GET返回500内部服务器错误

Question

当我点击一个时,我收到500内部服务器错误Ajax.ActionLink.我有一个由多个部分组成的个人资料页面.每个部分都对服务器进行Ajax调用,以允许编辑与该特定部分相关的用户信息.

我已经实现了3个部分功能,并且功能正常.我现在正在处理的那个应该首先显示上传图像的列表 - 如果用户没有上传任何图像,Ajax.ActionLink则将显示之前提到的图像,当点击该图像时将使用户部分地促进图像上载.

这是我点击链接时在Chrome中看到的内容:

这是GET和POST ActionResults:

    //
    // GET: /Tenants/TenantUploadReference

    [HttpGet]
    public ActionResult TenantUploadReference()
    {
        try
        {
            var currentTenant = tenantRepository.GetLoggedInTenant();
            if (currentTenant.ReferencePhotos == null)
            {
                currentTenant.ReferencePhotos = currentTenant.ReferencePhotos ?? new List<ReferencePhoto>();
            }
            return PartialView("_TenantUploadReferencePartial", currentTenant.ReferencePhotos.ToList());
        }
        catch (Exception e)
        {
            ModelState.AddModelError("", e);
            return View();
        }
    }

    //
    // POST: /Tenants/TenantUploadReference

    [HttpPost]
    public ActionResult TenantUploadReference(HttpPostedFileBase file, Tenant tenant)
    {
        try
        {
            if (file != null)
            {
                if (file.ContentLength > 10240)
                {
                    ModelState.AddModelError("file", "The size of the file should not exceed 10 KB");
                    return View();
                }

                var supportedTypes = new[] { "jpg", "jpeg", "png", "JPG", "JPEG", "PNG" };
                var fileExt = System.IO.Path.GetExtension(file.FileName).Substring(1);

                if (!supportedTypes.Contains(fileExt))
                {
                    ModelState.AddModelError("photo", "Invalid type. Only the following types (jpg, jpeg, png) are supported.");
                    return View();
                }

                using (var db = new LetLordContext())
                {
                    var reference = db.Image.Create<ReferencePhoto>();

                    // Convert HttpPostedFileBase to byte array
                    MemoryStream target = new MemoryStream();
                    file.InputStream.CopyTo(target);
                    byte[] photo = target.ToArray();

                    reference.File = photo;
                    reference.Format = fileExt;
                    reference.DateUploaded = DateTime.Now.Date;
                    reference.Description = "";
                    reference.Name = "";

                    db.Image.Add(reference);
                    db.SaveChanges();

                    return PartialView("_TenantReferencePhotosPartial", file);
                }

            }
            else
            {
                return View();
            }
        }
        catch (Exception e)
        {
            ModelState.AddModelError("", e);
            return View();
        }
    }

当我通过GET上的断点单步执行调试器时,ActionResult它会命中return PartialView并且不会抛出任何异常.

在_TenantUploadReferencePartial我用

@using (Ajax.BeginForm("TenantUploadReference", "Tenants", FormMethod.Post, new AjaxOptions { InsertionMode = InsertionMode.Replace, HttpMethod = "POST", UpdateTargetId = "tenant-reference-photos" }))

而在_TenantReferencePhotosPartial(ActionLink投掷500错误)我用这个

@if (Model.ReferencePhotos == null)
{
    <h3>You haven't uploaded any references! 
        @Ajax.ActionLink("Upload now?",
            "TenantUploadReference",
            new AjaxOptions
            {
                UpdateTargetId = "tenant-reference-photos",
                InsertionMode = InsertionMode.Replace,
                HttpMethod = "GET",
                LoadingElementId = "ajax-loader"
            })</h3>

知道页面上的其他部分按预期工作也可能很有用,所以我认为缺少脚本是一个问题.我不知道为什么会这样 - 一个解决方案将非常感激.

Answer 1

我已经解决了这个问题。我正在返回currentTenant.ReferencePhotos.ToList()，抛出了一个ArgumentNullException. 现在我刚刚返回currentTenant，并且 GET 正在按预期工作。