不處理Azure ASP.NET REST Web服務調用

Question

我正在試驗新的Azure機器學習服務，並已根據我的模型創建了一個Web服務。 該服務運行良好，因為當我使用HTTPS工具對其進行POST時，可以獲得預期的結果。

我的問題是讓我的ASP.NET代碼可以使用它。 我正在使用通過機器學習Web服務詳細信息頁面提供的代碼。 我知道它可以正確地發布所有內容，並且在我跟蹤通信時，Web服務返回正確的JSON。 但是由於某種原因，我的代碼無法確認此返回。

我已經從Azure網站和Visual Studio中的本地站點運行了此代碼

namespace website
{
    public partial class ML : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            InvokeRequestResponseService().Wait();
            //await InvokeRequestResponseService();
        }
        static async Task InvokeRequestResponseService()
        {
            using (var client = new HttpClient())
            {
                ScoreData scoreData = new ScoreData()
                {
                    FeatureVector = new Dictionary<string, string>() 
                    {
                        { "age", "0" },
                        { "education", "0" },
                        { "education-num", "0" },
                        { "marital-status", "0" },
                        { "relationship", "0" },
                        { "race", "0" },
                        { "sex", "0" },
                        { "capital-gain", "0" },
                        { "capital-loss", "0" },
                        { "hours-per-week", "0" },
                        { "native-country", "0" },
                    },
                    GlobalParameters =
                        new Dictionary<string, string>()
                        {
                        }
                };

                ScoreRequest scoreRequest = new ScoreRequest()
                {
                    Id = "score00001",
                    Instance = scoreData
                };

                const string apiKey = "dg/pwCd7zMPc57lfOSJqxP8nbtKGV7//XXXXXXXXXXXXXXXXXXXXXXXXXXXXgvdVl/7VWjqe/ixOA=="; // Replace this with the API key for the web service
                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);

                client.BaseAddress = new Uri("https://ussouthcentral.services.XXXXXXX.net/workspaces/a932e11XXXXXXXXXXX29a69170eae9ed4/services/e8796c4382fb4XXXXXXXXXXXddac357/score");  

// GETS STUCK ON THE NEXT LINE
                HttpResponseMessage response = await client.PostAsJsonAsync("", scoreRequest); <---- NEVER RETURNS FROM THIS CALL

                if (response.IsSuccessStatusCode)
                {
                    string result = await response.Content.ReadAsStringAsync();
                    Console.WriteLine("Result: {0}", result);
                }
                else
                {
                    Console.WriteLine("Failed with status code: {0}", response.StatusCode);
                }
            }
        }
    }

    public class ScoreData
    {
        public Dictionary<string, string> FeatureVector { get; set; }
        public Dictionary<string, string> GlobalParameters { get; set; }
    }

    public class ScoreRequest
    {
        public string Id { get; set; }
        public ScoreData Instance { get; set; }
    }
}

Answer 1

此問題是由於這里討論的錯誤所致- 使用await / async時HttpClient.GetAsync（...）從不返回

基本上，您需要添加ConfigureAwait（false）方法。

所以代碼行現在看起來像

HttpResponseMessage response = await client.PostAsJsonAsync("", scoreRequest).ConfigureAwait(false);