Asp.NET MVC--文件上传图像值在httppost方法中显示空值

Question

我有一个MultipartForms，我可以在其中上传图像和其他表单值。尽管如此，表单值是通过FormCollection属性正确接收的，而Upload文件总是在HttpPostedFileBase属性中显示null值。我浏览过论坛，但找不到哪里出了问题。这就是我所做的。请仔细检查并说出哪里出了问题。谢谢朋友。

enter code here

cshtml:

 @using (Html.BeginForm("Create", "StaffRegistration", FormMethod.Post, new  { enctype = "multipart/form-data" }))
 {
 <input type="file" name="StaffImage" id="StaffImage" />
 }

控制器

[AcceptVerbs(HttpVerbs.Post)]
 public ActionResult Create(FormCollection collection,HttpPostedFileBase File)
 {
 try
 {
 // TODO: Add insert logic here

 StaffRegistration StaffReg = new StaffRegistration();
 StaffReg.FirstName = collection["FirstName"].ToString();
 StaffReg.LastName = collection["LastName"].ToString();
 StaffReg.DateOfBirth = DateTime.Parse(collection["DateofBirth"]);
 StaffReg.Nationality = collection["Nationality"].ToString();
 StaffReg.Gender = collection["Gender"].ToString(); 
 StaffReg.MaritalStatus = collection["MaritalStatus"].ToString();
 StaffReg.BloodGroup = collection["BloodGroup"].ToString();
 StaffReg.StaffName = collection["StaffName"].ToString();
 StaffReg.MiddleName = collection["MiddleName"].ToString();
 HttpPostedFileBase file = Request.Files["StaffImage"];
 StaffRegistrationBusSer StaffRegBusSer = new StaffRegistrationBusSer();
 StaffRegBusSer.AddStaffReg(StaffReg,file);
 return RedirectToAction("Index");
 }

数据层

public bool AddStaffRegistraiton(StaffRegistration staffRegistration,HttpPostedFileBase File)
 {
 staffRegistration.StaffImage = ConvertToByte(File);
 using(SqlConnection Con = new SqlConnection(ConnectionString))
 {
 SqlParameter paramImage = new SqlParameter();
 paramImage.ParameterName = "@StaffImage";
 paramImage.Value = staffRegistration.StaffImage;
 Cmd.Parameters.Add(paramImage);
 Con.Open();
 Cmd.ExecuteNonQuery();
 }
 return true;
 }
ConvertToByte function:
 public byte[] ConvertToByte(HttpPostedFileBase Image)
 {
 byte[] imagebyte = null;
 BinaryReader Reader = new BinaryReader(Image.InputStream);
 imagebyte = Reader.ReadBytes((int)Image.ContentLength);
 return imagebyte;
 } 

Answer 1

cshtml页面：

 @using (Html.BeginForm("Index", "Home", FormMethod.Post, new  { enctype = "multipart/form-data" }))
 {
        <div class="form-group">
            @Html.LabelFor(model => model.StaffName, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.StaffName)
                @Html.ValidationMessageFor(model => model.StaffName)
            </div>
        </div>

      <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="file" name="StaffImage" id="StaffImage" />
            </div>
        </div>
 }

实际上，我必须在视图级别包含multipart/form，而不是特定的上传文件。然后，我在.cs.html页面中这样修改。现在，我的代码运行良好