ASP MVC文件上传HttpPostedFileBase为Null [英] ASP MVC FIle Upload HttpPostedFileBase is Null

问题描述

在我的控制器我有，因为我希望能够填写有关视频的一些细节，实际上传，视频类不，因为它会被传递到另一个网络服务需要实际的视频。

In my controller I have, because I wanted to be able to fill out some details about the video and actually upload it, the Video class doesn't need the actual video because it's going to be passed to another web service.

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VM的videoModel部分填写的表单，但VID实际的文件为空。
任何想法？

When I submit the form the videoModel part of VM is filled out but vid the actual file is null. Any ideas?

推荐答案

根据OP评论更新

设置最大文件长度在web.config文件
更改？到你想成为你的最大文件大小，例如65536为64MB

set the Max file length in the web.config file Change the "?" to a file size that you want to be your max, for example 65536 is 64MB

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

您不能将文件添加到模型中，这将是在自己的领域不是模型的一部分​​

You can't add the file to the model, it will be in it's own field not part of the model

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

您的动作不正确。它需要接受该文件作为它自己的参数（或如果有多个使用的IEnumerable＆LT; HttpPostedFileBase＆GT; 作为参数类型）

Your action is incorrect. It needs to accept the file as it's own parameter (or if multiple use IEnumerable<HttpPostedFileBase> as the parameter type)

[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);
}

如果你允许多个文件被选中，你必须允许该

If you were allowing multiple files to be selected you have to allow for that

[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);
}

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