VS2017.NET WEB应用的认知服务

我正在尝试使用授权令牌异步进行连续识别。但是它涉及访问令牌访问。它卡住了。它适用于控制台应用程序。但不适用于.NET Web表单应用程序。你能帮我解决这个问题。

I am trying to use Continuous Recognition With Authorization Token Async. But wen it comes to access token access. it get stuck. It work with console application. but not with .NET Web form application. Can you help me with this issue.

//通过向令牌服务发送POST请求来获取授权令牌。

的&NBSP; &NBSP; &NBSP; &NBSP; public static async Task< string> GetToken（字符串subscriptionKey，字符串区域）

  &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;使用（var client = new HttpClient（））

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

// ******一旦采用这种方法，它就会被卡住了。
  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; client.DefaultRequestHeaders.Add（" Ocp-Apim-Subscription-Key"，subscriptionKey）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; UriBuilder uriBuilder =新的UriBuilder（" https：//" region " .api.cognitive.microsoft.com / sts / v1.0 / issueToken"）;



  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; using（var result = await client.PostAsync（uriBuilder.Uri.AbsoluteUri，null））

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; Console.WriteLine（" Token Uri：{0}"，uriBuilder.Uri.AbsoluteUri）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; if（result.IsSuccessStatusCode）

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; return await result.Content.ReadAsStringAsync（）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;否则

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;抛出新的HttpRequestException（$"无法从{uriBuilder.ToString（）}获取令牌。错误：{result.StatusCode}"）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }

  &NBSP; &NBSP; &NBSP; }

//******Onceit come to this method, it got stuck
                client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
                UriBuilder uriBuilder = new UriBuilder("https://" region ".api.cognitive.microsoft.com/sts/v1.0/issueToken");

                using (var result = await client.PostAsync(uriBuilder.Uri.AbsoluteUri, null))
                {
                    Console.WriteLine("Token Uri: {0}", uriBuilder.Uri.AbsoluteUri);
                    if (result.IsSuccessStatusCode)
                    {
                        return await result.Content.ReadAsStringAsync();
                    }
                    else
                    {
                        throw new HttpRequestException($"Cannot get token from {uriBuilder.ToString()}. Error: {result.StatusCode}");
                    }
                }
            }
        }

谢谢