asp.net-mvc – 保存为“BodyPart_3ded2bfb-40be-4183-b789-9301

我正在使用ASP.NET Web API上传文件。我在RC之前这样做了，但由于某种原因，该文件被保存为“BodyPart_3ded2bfb-40be-4183-b789-9301f93e90af”而不是文件名。下面的文件名变量也返回此bodypart字符串，而不是文件名。我似乎不知道我在哪里错了。任何帮助是赞赏。

客户代码：

function upload() {
    $("#divResult").html("Uploading...");
    var formData = new FormData($('form')[0]); 
    $.ajax({
        url: 'api/files/uploadfile?folder=' + $('#ddlFolders').val(),type: 'POST',success: function (data) {
            $("#divResult").html(data);
        },data: formData,cache: false,contentType: false,processData: false
    });
};

控制器：

public Task<HttpResponseMessage> UploadFile([FromUri]string folder)
    {
        if (!Request.Content.IsMimeMultipartContent())
        {
            throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.UnsupportedMediaType));
        }

        // Save file
        MultipartFormDataStreamProvider provider = new MultipartFormDataStreamProvider(HttpContext.Current.Server.MapPath("~/Files"));
        Task<IEnumerable<HttpContent>> task = Request.Content.ReadAsMultipartAsync(provider);

        return task.ContinueWith<HttpResponseMessage>(contents =>
        {
            string filename = provider.BodyPartFileNames.First().Value;
            return new HttpResponseMessage()
          {
              Content = new StringContent(string.Format("File saved in {0}.",folder))
          };

        },TaskScheduler.FromCurrentSynchronizationContext());

文件看起来像：