c# - ASP MVC 文件上传 HttpPostedFileBase 为空

Question

在我的 Controller 中，因为我希望能够填写有关视频的一些详细信息并实际上传它，Video 类不需要实际视频，因为它将被传递到另一个网络服务。

public class VideoUploadModel
    {
        public HttpPostedFileBase vid { get; set; }
        public Video videoModel { get; set; }
    }

    //
    // POST: /Video/Create
    [HttpPost]
    public ActionResult Create(VideoUploadModel VM)
    {
        if (ModelState.IsValid)
        {
            db.Videos.AddObject(VM.videoModel);
            db.SaveChanges();
            return RedirectToAction("Index");  
        }

        ViewBag.UserId = new SelectList(db.DBUsers, "Id", "FName", VM.videoModel.UserId);
        return View(VM);
    }

在我看来我有

@model LifeHighlightsShoeLace.Controllers.VideoController.VideoUploadModel
@{
   ViewBag.Title = "Create";
}

<h2>Create</h2>

<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>

@using (Html.BeginForm("Create", "Video", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.ValidationSummary(true)
<fieldset>
    <legend>Video</legend>

    <div class="editor-label">
        @Html.LabelFor(model => model.videoModel.KalturaID)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.videoModel.KalturaID)
        @Html.ValidationMessageFor(model => model.videoModel.KalturaID)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.videoModel.Size)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.videoModel.Size)
        @Html.ValidationMessageFor(model => model.videoModel.Size)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.videoModel.Date)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.videoModel.Date)
        @Html.ValidationMessageFor(model => model.videoModel.Date)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.videoModel.UploadedBy)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.videoModel.UploadedBy)
        @Html.ValidationMessageFor(model => model.videoModel.UploadedBy)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.videoModel.UserId, "User")
    </div>

    <div class="editor-field">
        @Html.DropDownList("UserId", String.Empty)
        @Html.ValidationMessageFor(model => model.videoModel.UserId)
    </div>
    <div class="editor-field">
    <input name="model.vid" type="file" />
    </div>
    <p>
        <input type="submit" value="Create" />
    </p>
</fieldset>

当我提交表单时，VM 的 videoModel 部分已填写，但 vid 实际文件为空。有什么想法吗？

Answer 1

根据OP评论更新

在 web.config 文件中设置最大文件长度改变“？”到你想要的最大文件大小，例如 65536 是 64MB

<configuration>
  <system.web>
    <httpRuntime maxRequestLength="?" /> 
  </system.web>
</configuration>

您不能将文件添加到模型中，它将位于它自己的字段中，而不是模型的一部分

<input name="videoUpload" type="file" />

您的操作不正确。它需要接受文件作为它自己的参数(或者如果多次使用 IEnumerable<HttpPostedFileBase> 作为参数类型)

[HttpPost]
public ActionResult Create(VideoUploadModel VM, HttpPostedFileBase videoUpload)
{
    if (ModelState.IsValid)
    {
        if(videoUpload != null) { // save the file
            var serverPath = server.MapPath("~/files/" + newName);
            videoUpload.SaveAs(serverPath);
        }

        db.SaveChanges();
        return RedirectToAction("Index");  
    }

    ViewBag.UserId = new SelectList(db.DBUsers, "Id", "FName", VM.videoModel.UserId);
    return View(VM);
}

如果您允许选择多个文件，则必须允许

[HttpPost]
public ActionResult Create(VideoUploadModel VM, IEnumerable<HttpPostedFileBase> videoUpload)
{
    if (ModelState.IsValid)
    {
        if(videoUpload != null) { // save the file
            foreach(var file in videoUpload) {
                var serverPath = server.MapPath("~/files/" + file.Name);
                file.SaveAs(serverPath);
            }
        }

        db.SaveChanges();
        return RedirectToAction("Index");  
    }

    ViewBag.UserId = new SelectList(db.DBUsers, "Id", "FName", VM.videoModel.UserId);
    return View(VM);
}