Http Post 永远不会从 Twilio 返回，但会执行 Twilio 操作

Question

我无法在 Microsoft Dynamics 365 中使用 Twilio SDK（Twilio 库未安装在 Dynamics 中，并且无法在我的插件注册中包含 dll），因此我不得不使用 HttpClient 进行 http 发布。对 Twilio 的调用成功发生，因为 Twilio 能够向我发送一封验证电子邮件，但 PostAsync 之后的断点从未被命中，也没有捕获到异常。我需要从 PostAsync 捕获输出。我做错了什么？

    public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    public class TwilioMessageInput
    {
        public string To { get; set; }
        public string Channel { get; set; }
    }


    public class TwilioMessageOutput
    {
        public string Message { get; set; }
    }


    private void button1_Click(object sender, EventArgs e)
    {
        // https://www.twilio.com/docs/verify
        // https://www.twilio.com/docs/verify/email

        string url = "https://verify.twilio.com/v2/Services/VA********************************/Verifications/";
        string authToken = "AC********************************:********************************"; //-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
        string email = "***************@************.com";

        var formContent = new FormUrlEncodedContent(new[]
        {
            new KeyValuePair<string, string>("To", email),
            new KeyValuePair<string, string>("Channel", "email")
        });

        using (var client = new Rest(url))
        {
            var response = client.PostAsync<TwilioMessageOutput>(url, formContent, authToken).Result;
        }
    }
}

public class Rest : IDisposable
{
    private readonly TimeSpan _timeout;
    private HttpClient _httpClient;
    private HttpClientHandler _httpClientHandler;
    private readonly string _baseUrl;
    private const string ClientUserAgent = "twillio-client-v1";
    private const string MediaTypeJson = "application/json";

    public Rest(string baseUrl, TimeSpan? timeout = null)
    {
        _baseUrl = NormalizeBaseUrl(baseUrl);
        _timeout = timeout ?? TimeSpan.FromSeconds(90);
        //_timeout = TimeSpan.FromSeconds(1);
    }

    private async Task<string> PostAsyncInternal(string url, FormUrlEncodedContent input, string authToken)
    {
        try
        {
            EnsureHttpClientCreated();

            var byteArray = Encoding.ASCII.GetBytes(authToken);
            _httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));

            using (var response = await _httpClient.PostAsync(url, input))
            {
                response.EnsureSuccessStatusCode();
                return await response.Content.ReadAsStringAsync();
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }

    }

    public async Task<TResult> PostAsync<TResult>(string url, FormUrlEncodedContent input, string authToken) where TResult : class, new()
    {
        var strResponse = await PostAsyncInternal(url, input, authToken);

        return JsonConvert.DeserializeObject<TResult>(strResponse, new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver()
        });
    }


    public void Dispose()
    {
        _httpClientHandler?.Dispose();
        _httpClient?.Dispose();
    }

    private void CreateHttpClient()
    {
        _httpClientHandler = new HttpClientHandler
        {
            AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip
        };

        _httpClient = new HttpClient(_httpClientHandler, false)
        {
            Timeout = _timeout
        };

        _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd(ClientUserAgent);

        if (!string.IsNullOrWhiteSpace(_baseUrl))
        {
            _httpClient.BaseAddress = new Uri(_baseUrl);
        }

        _httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(MediaTypeJson));
    }

    private void EnsureHttpClientCreated()
    {
        if (_httpClient == null)
        {
            CreateHttpClient();
        }
    }

    private static string ConvertToJsonString(object obj)
    {
        if (obj == null)
        {
            return string.Empty;
        }

        return JsonConvert.SerializeObject(obj, new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver()
        });
    }

    private static string NormalizeBaseUrl(string url)
    {
        return url.EndsWith("/") ? url : url + "/";
    }
}

Answer 1

这里是 Twilio 开发者宣传员。

我不是 C# 或 Dynamics 开发人员，如果这没有帮助，非常抱歉。当您提出请求时：

var response = client.PostAsync<TwilioMessageOutput>(url, formContent, authToken).Result;

这是一个异步请求，但您似乎根本没有等待异步响应。应该这样吗？

var response = await client.PostAsync<TwilioMessageOutput>(url, formContent, authToken).Result;