11

我有一个需要接受multipart/form-data客户端作为 POST 请求发送的控制器方法。表单数据有 2 个部分。一个是序列化的对象application/json,另一部分是作为application/octet-stream. 我的控制器上有这样的方法:

[AcceptVerbs(HttpVerbs.Post)]
void ActionResult Photos(PostItem post)
{
}

我可以在这里毫无问题地获取文件。Request.File但是 PostItem 为空。不知道为什么?有任何想法吗

控制器代码:

/// <summary>
/// FeedsController
/// </summary>
public class FeedsController : FeedsBaseController
{
    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Photos(FeedItem feedItem)
    {
        //Here the feedItem is always null. However Request.Files[0] gives me the file I need  
        var processor = new ActivityFeedsProcessor();
        processor.ProcessFeed(feedItem, Request.Files[0]);

        SetResponseCode(System.Net.HttpStatusCode.OK);
        return new EmptyResult();
    }

}

网络上的客户端请求如下所示:

{User Agent stuff}
Content-Type: multipart/form-data; boundary=8cdb3c15d07d36a

--8cdb3c15d07d36a
Content-Disposition: form-data; name="feedItem"
Content-Type: text/xml

{"UserId":1234567,"GroupId":123456,"PostType":"photos",
    "PublishTo":"store","CreatedTime":"2011-03-19 03:22:39Z"}

--8cdb3c15d07d36a
Content-Disposition: file; filename="testFile.txt"
ContentType: application/octet-stream

{bytes here. Removed for brevity}
--8cdb3c15d07d36a--
4

2 回答 2

6

课堂是什么FeedItem样子的?对于我在帖子信息中看到的内容,它应该类似于:

public class FeedItem
{
    public int UserId { get; set; }
    public int GroupId { get; set; }
    public string PublishTo { get; set; }
    public string PostType { get; set; }
    public DateTime CreatedTime { get; set; }
}

否则不会被绑定。您可以尝试更改操作签名,看看这是否有效:

[HttpPost] //AcceptVerbs(HttpVerbs.Post) is a thing of "the olden days"
public ActionResult Photos(int UserId, int GroupId, string PublishTo
    string PostType, DateTime CreatedTime)
{
    // do some work here
}

您甚至可以尝试HttpPostedFileBase为您的操作添加一个参数:

[HttpPost]
public ActionResult Photos(int UserId, int GroupId, string PublishTo
    string PostType, DateTime CreatedTime, HttpPostedFileBase file)
{
    // the last param eliminates the need for Request.Files[0]
    var processor = new ActivityFeedsProcessor();
    processor.ProcessFeed(feedItem, file);

}

如果你真的感到狂野和顽皮,HttpPostedFileBase请添加FeedItem

public class FeedItem
{
    public int UserId { get; set; }
    public int GroupId { get; set; }
    public string PublishTo { get; set; }
    public string PostType { get; set; }
    public DateTime CreatedTime { get; set; }
    public HttpPostedFileBase File { get; set; }
}

最后一个代码片段可能是您最终想要的结果,但逐步细分可能会对您有所帮助。

这个答案也可以帮助您朝着正确的方向前进:ASP.NET MVC 将模型 *together* 与文件一起传递回控制器

于 2011-03-19T10:42:14.293 回答
2

正如@Sergi 所说,将 HttpPostedFileBase 文件参数添加到您的操作中,我不知道 MVC3 但对于 1 和 2,您必须在表单/视图中指定您将像这样发布 multipart/form-data:

<% using (Html.BeginForm(MVC.Investigation.Step1(), FormMethod.Post, new { enctype = "multipart/form-data", id = "step1form" }))

这是在我的控制器中:

[HttpPost]
    [ValidateAntiForgeryToken]
    [Authorize(Roles = "Admin, Member, Delegate")]
    public virtual ActionResult Step1(InvestigationStep1Model model, HttpPostedFileBase renterAuthorisationFile)
    {
        if (_requesterUser == null) return RedirectToAction(MVC.Session.Logout());

        if (renterAuthorisationFile != null)
        {
            var maxLength = int.Parse(_configHelper.GetValue("maxRenterAuthorisationFileSize"));
            if (renterAuthorisationFile.ContentLength == 0)
            {
                ModelState.AddModelError("RenterAuthorisationFile", Resources.AttachAuthorizationInvalid);
            }
            else if (renterAuthorisationFile.ContentLength > maxLength * 1024 * 1204)
            {
                ModelState.AddModelError("RenterAuthorisationFile", string.Format(Resources.AttachAuthorizationTooBig, maxLength));
            }
        } 
        if(ModelState.IsValid)
        {
            if (renterAuthorisationFile != null && renterAuthorisationFile.ContentLength > 0)
            {
                var folder = _configHelper.GetValue("AuthorizationPath");
                var path = Server.MapPath("~/" + folder);
                model.RenterAuthorisationFile = renterAuthorisationFile.FileName;
                renterAuthorisationFile.SaveAs(Path.Combine(path, renterAuthorisationFile.FileName));
            }
            ...
            return RedirectToAction(MVC.Investigation.Step2());
        }
        return View(model);
    }

希望能帮助到你!

于 2011-03-19T15:42:17.370 回答