单击按钮编辑用户并提交图像

Question

我想编辑用户详细信息，同时使用相同的按钮上传照片，但在我尝试保存文件时，HttpPostedFileBase始终为空。

图片模型

public class Image
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [HiddenInput(DisplayValue = false)]
    [Key]
    public Guid ID { get; set; }

    public string UserID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    public string FilePath { get; set; }
    public int Counter { get; set; }

    [Required(ErrorMessage = "Please select file")]
    public HttpPostedFileBase File { get; set; }

    public virtual ApplicationUser ApplicationUsers { get; set; }
    public virtual Job Jobs { get; set; }
}

ParentViewModel

public class ImgAndUser
{
    public EditUserViewModel EditUser { get; set; }
    public Image EditImage { get; set; }
}

编辑控制器：

    [HttpPost]
    public async Task<ActionResult> Edit(ImgAndUser IU, HttpPostedFileBase file)
    {
        if (file != null && IU.EditImage.File.ContentLength > (2 * 1024 * 1024))
        {
            ModelState.AddModelError("Custom Error", "File must be less than 2 MB or doesn't exist");
            return View();
        }
        else if(!(IU.EditImage.File.ContentType == "image/jpeg" || IU.EditImage.File.ContentType == "image/gif" || IU.EditImage.File.ContentType == "image/jpg"))
        {
            ModelState.AddModelError("CustomError", "Only jpeg and gif formats");
            return View();
        }

        else
        {
            string fileName = Guid.NewGuid() + Path.GetExtension(file.FileName);
            string path = HttpContext.Server.MapPath("~/FilesDB/Images");
            file.SaveAs(Path.Combine(Server.MapPath("~/FilesDB/Images"), fileName));

            IU.EditImage.ID = Guid.NewGuid();
            IU.EditImage.FileName = IU.EditImage.File.FileName;
            IU.EditImage.ImageSize = IU.EditImage.File.ContentLength;

            byte[] data = new byte[IU.EditImage.File.ContentLength];
            IU.EditImage.File.InputStream.Read(data, 0, IU.EditImage.File.ContentLength);

            IU.EditImage.ImageData = data;
            IU.EditImage.UserID = LoggedUserId;
            IU.EditImage.FilePath = path;
        }

        if (ModelState.IsValid)
        {                     
            var user = await UserManager.FindByIdAsync(IU.EditUser.Id);

            if (user == null)
            {
                ModelState.AddModelError("", "User not found");
            }

            else
            {
                user.Email = IU.EditUser.Email;
                user.Name = IU.EditUser.Name;
                user.Surname = IU.EditUser.Surname;
                user.City = IU.EditUser.City;
                user.ZIP = IU.EditUser.ZIP;
                user.Street = IU.EditUser.Street;
                user.Nr = IU.EditUser.Nr;
                user.CompName = IU.EditUser.CompName;
                user.CUI = IU.EditUser.CUI;
                user.DescCompany = IU.EditUser.DescCompany;

                try
                {
                    //collect all images except final one
                    var existImgRows = context.Images.Where(x => x.UserID == LoggedUserId).OrderByDescending(x => x.ID).Skip(0).Select(x => x);

                    if (existImgRows != null)
                    {
                        foreach (var item in existImgRows)
                        {
                            context.Entry(item).State = System.Data.Entity.EntityState.Deleted;
                        }
                    }
                    context.Entry(IU.EditImage).State = System.Data.Entity.EntityState.Added;
                    context.SaveChanges();
                    return RedirectToAction("Details", "Jobs", new { controller = "JobsController", action = "Details", id = Session["DetailsURL"] });
                }

                catch (DbEntityValidationException ex)
                {
                    foreach (var validationErrors in ex.EntityValidationErrors)
                    {
                        foreach (var validationError in validationErrors.ValidationErrors)
                        {
                            Console.WriteLine("Property: {0} throws Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
                        }
                    }
                }
            }
        }

        ModelState.AddModelError("", "Something failed");
        return View();
    }

在else { }语句string fileName = Guid.NewGuid() + Path.GetExtension(file.FileName);中，参数file为null，但if语句与我在浏览器中选择的文件数据一起传递。

修改视图

 @using (Html.BeginForm("Edit", "ImgAndUser", null, FormMethod.Post, new { enctype = "multipart/form-data" })) 
{ 
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(m => Model.EditUser.Id)

        <div class="form-group">
            @Html.LabelFor(m => Model.EditUser.Email, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(m => Model.EditUser.Email, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(m => Model.EditUser.Email, "", new { @class = "text-danger" })
            </div>
        </div>   
.
.
         Losts of stuff similar with above.
.
.
    </div>  

    @Html.ValidationSummary(true)
    @Html.HiddenFor(model => Model.EditImage.ID);
    <table>
        <tr>
            <td>Select File : </td>
            <td>
                @Html.TextBoxFor(Image => Model.EditImage.File, new { type = "file" })
                @Html.ValidationMessage("CustomError")
            </td>

            <td>
                <input type="submit" value="Save" />
            </td>

        </tr>
    </table>
}