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如何使用ASP.NET MVC4 Web Api上传大文件
并获得进展？

我看到这篇文章,我知道如何处理上传的文件,但我如何获得进度数据？ 如何接受文件POST

请不要发送链接上传产品.我想了解如何在MVC4 Web Api中处理这个...这里是一个处理MVC4 WebApi文件上传的示例代码

    public async Task<HttpResponseMessage> Post()
    {
        if (Request.Content.IsMimeMultipartContent())
        {
            var path = HttpContext.Current.Server.MapPath("~/App_Data");

            var provider = new MultipartFormDataStreamProvider(path);

            await Request.Content.ReadAsMultipartAsync(provider).ContinueWith(t =>
            {
                if (t.IsFaulted || t.IsCanceled)
                    throw new HttpResponseException(HttpStatusCode.InternalServerError);
            });

            return Request.CreateResponse(HttpStatusCode.OK); 
        }
        else
        {
            throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotAcceptable, "This request is not properly formatted"));
        }
    }

现在,当

   await Request.Content.ReadAsMultipartAsync(provider)

我怎样才能得到字节加载的方式？