System.Web.HttpPostedFileWrapper 在 MVC C# 中将图像上传到数据库时出错

Question

我这里有问题。 当我从我的 BeginForm 中删除("Create", "DriverRegs", FormMethod.Post, new { enctype = "multipart/form-data" }) ，图像路径通常存储在数据库中，但是当我把它放回上面时到 BeginForm，然后图像文件存储在我的文件夹中，但在数据库中出现此错误System.Web.HttpPostedFileWrapper 。 代码有什么问题？ 如果有人可以帮助我，我将不胜感激。 提前致谢。

这是我的代码：

控制器

public ActionResult Create(DriverReg model, HttpPostedFileBase file)       
{
        if (ModelState.IsValid)
        {
            if (file != null && file.ContentLength > 0)
            {
                var fileName = Path.GetFileName(file.FileName);
                var phisicalPath = Path.Combine(Server.MapPath("~/Content/uploads/"), fileName);
                file.SaveAs(phisicalPath);
                DriverReg newRecord = new DriverReg();
                newRecord.FullName = model.FullName;
                newRecord.Address = model.Address;
                newRecord.Postcode = model.Postcode;
                newRecord.Contact = model.Contact;
                newRecord.Email = model.Email;
                newRecord.County = model.County;
                newRecord.File = phisicalPath;
            }
            db.DriverRegs.Add(model);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(model);
    }

型号

 public class DriverReg
    {
        [Key]
        public int DrvId { get; set; }
        public string FullName { get; set; }
        public string Address { get; set; }
        public string Postcode { get; set; }
        public string Contact { get; set; }
        public string Email { get; set; }
        public string County { get; set; }
        [DataType(DataType.Upload)]
        [Display(Name = "Upload Files")]
        [Required(ErrorMessage = "Please choose file to upload")]
        public string File { get; set; }
        public DateTime Date { get; set; }


        internal int UploadImageInDataBase(HttpPostedFileBase file, DriverRegViewModel model)
        {
            throw new NotImplementedException();
        }

    }
    public class DriverDbContext : DbContext
    {
        public DriverDbContext()
            : base("VanRemovals")
        {
        }

    public static DriverDbContext Create()
        {
            return new DriverDbContext();
        } 

          public DbSet<DriverReg> DriverRegs { get; set; }
    }

查看

 @using (Html.BeginForm("Create", "DriverRegs", FormMethod.Post, new { enctype = "multipart/form-data" }))
    {
        @Html.AntiForgeryToken()
        
        <div class="form-horizontal">
            <h4>DriverReg</h4>
            <hr />
            @Html.ValidationSummary(true, "", new { @class = "text-danger" })
            <div class="form-group">
                @Html.LabelFor(model => model.FullName, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.FullName, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.FullName, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                @Html.LabelFor(model => model.Address, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.Address, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.Address, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                @Html.LabelFor(model => model.Postcode, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.Postcode, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.Postcode, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                @Html.LabelFor(model => model.Contact, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.Contact, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.Contact, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                @Html.LabelFor(model => model.Email, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.Email, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                @Html.LabelFor(model => model.County, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.County, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.County, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                @Html.LabelFor(model => model.File, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    <input type="file" class="file-input" name="file" />
                    @Html.ValidationMessageFor(model => model.File, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                @Html.LabelFor(model => model.Date, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.Date, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.Date, "", new { @class = "text-danger" })
                </div>
            </div>
    
            <div class="form-group">
                <div class="col-md-offset-2 col-md-10">
                    <input type="submit" value="Create" class="btn btn-default" />
                </div>
            </div>
        </div>
    }
    
    <div>
        @Html.ActionLink("Back to List", "Index")
    </div>
</body>
</html>

Answer 1

这是困扰您的小细节，因此请按照注释进行更改

  db.DriverRegs.Add(newRecord);//change this part
                db.SaveChanges();

编辑

首先我不知道当你删除你的位时它是如何工作的，但是你想要保存的不是DriveReg model因为那是你正在做的。 相反，您想保存DriverReg newRecord

当表单发布到控制器时，它将文件作为System.Web.HttpPostedFileWrapper因此如果您保存DriverReg model ，这就是您将在数据库中拥有的DriverReg model 。 在这一点上，你有没有做过逻辑位拿到phisicalPath为你呈现你想要DriverReg newRecord 。 由于newRecord和model都是相同类型的DriverReg看起来好像您正在保存正确的数据，但实际上并非如此。