c# HttpClient上传和下载的进度显示问题

WebClient中有DownloadProgressChangedEventHandler等事件可以响应http请求(或者其他web请求)的进度。
在c# 5.0中,HttpClient的函数都是以Task异步函数存在，没有事件可以回调显示上传或下载的进度。
我找了很久，终于发现ProgressMessageHandler 可以解决这个问题，
具体示例代码
               HttpClientHandler hand = new HttpClientHandler();
                ProgressMessageHandler processMessageHander = new ProgressMessageHandler(hand);
                HttpClient localHttpClient = new HttpClient(processMessageHander);

HttpRequestMessage httpRequestMessage = new HttpRequestMessage();

httpRequestMessage.Method = HttpMethod.Put;
httpRequestMessage.Content = new StreamContent(content);

//for upload

                processMessageHander.HttpSendProgress += (sender, e) =>
                {
                    int num = e.ProgressPercentage;     //you can use HttpProgressEventArgs e

};

//for download

               // processMessageHander.HttpReceiveProgress += (sender, e) =>
              //   {
               //      int num = e.ProgressPercentage;

// };

HttpResponseMessage test = await localHttpClient.SendAsync(httpRequestMessage);

// dispose the resource

补充：软件开发 , C# ,