System.Net.WebException：在本地模拟器上进行UiTesting时POST失败

如何解决System.Net.WebException：在本地模拟器上进行UiTesting时POST失败

我正在尝试验证LoginPage的UI元素是否按预期工作。该测试应该将用户名，用户密码和服务器地址写入相应的输入字段，然后点击“登录”按钮。

UITest加载LoginPage，然后由于以下异常而失败：

Nachricht: 
    System.Net.WebException : POST Failed
  Stapelüberwachung: 
    HttpClient.HandleHttpError(String method,Exception exception,ExceptionPolicy exceptionPolicy)
    HttpClient.SendData(String endpoint,String method,HttpContent content,ExceptionPolicy exceptionPolicy,Nullable`1 timeOut)
    HttpClient.Post(String endpoint,String arguments,Nullable`1 timeOut)
    HttpApplicationStarter.Execute(String intentJson)
    AndroidAppLifeCycle.LaunchApp(String appPackageName,ApkFile testServerApkFile,Int32 testServerPort)
    AndroidApp.ctor(IAndroidAppConfiguration appConfiguration,IExecutor executor)
    AndroidAppConfigurator.StartApp(AppDataMode appDataMode)
    ReplDroid.ConnectToDeviceAndr() Zeile 33
    ReplDroid.BeforeEachtest() Zeile 24

现在真正有趣的部分是它曾经工作过，但是在我添加了引发异常的代码（并再次将其删除）之后，它卡在了POST失败异常中。

要解决我的问题，我已经尝试过：对仿真器进行出厂重置，清洁解决方案并重建它，删除.vs文件夹，重新启动vs和仿真器，在不同的仿真器实例上进行测试以及重新启动整个PC。没有可靠的方法。

我的测试项目的代码如下：

using NUnit.Framework;
using System;
using System.Threading;
using Xamarin.UITest;

namespace REPL
{
    [TestFixture(Platform.Android)]
    public class ReplDroid
    {
        IApp app;
        Platform platform;
        LoginPageController loginPageController;
        MainMenuController mainMenuController;

        public ReplDroid(Platform platform)
        {
            this.platform = platform;
        }

        [SetUp]
        public void BeforeEachtest()
        {
            ConnectToDeviceAndr();

            loginPageController = new LoginPageController(app);
            mainMenuController = new MainMenuController(app);

        }

        private void ConnectToDeviceAndr()
        {
            app = ConfigureApp.Android
                .ApkFile(ApkLocation)
                .PreferIdeSettings()
                .EnableLocalScreenshots()
                .StartApp();
        }

        [Test]
        public void Login()
        {
            loginPageController.EnterUserNumber(UserNumber);
            loginPageController.EnterPassword(Password);
            loginPageController.EnterServerUrl(ServerUrl);
            loginPageController.SignIn();
        }
    }
}

using Xamarin.UITest;
using Xamarin.UITest.Queries;

namespace REPL
{
    public class LoginPageController
    {
        private readonly IApp app;

        private const string UserEntryAutomationId = "UserEntry";

        private const string PasswordEntryAutomationId = "PasswordEntry";

        private const string ServerUrlEntryAutomationId = "ServerUrlEntry";

        private const string LoginButtonAutomationId = "LoginButton";

        public LoginPageController(IApp app)
        {
            this.app = app;
        }

        public AppResult GetUserEntry() => app.GetByAutomationId(UserEntryAutomationId);

        public AppResult getpasswordEntry() => app.GetByAutomationId(PasswordEntryAutomationId);

        public AppResult GetServerUrlEntry() => app.GetByAutomationId(ServerUrlEntryAutomationId);

        public AppResult GetLoginButton() => app.GetByAutomationId(LoginButtonAutomationId);

        public void EnterUserNumber(string userNumber) => app.WaitAndContinue(UserEntryAutomationId).EnterText(userNumber);

        public void EnterPassword(string password) => app.WaitAndContinue(PasswordEntryAutomationId).EnterText(password);

        public void EnterServerUrl(string serverUrl) => app.WaitAndContinue(ServerUrlEntryAutomationId).EnterText(serverUrl);

        public void SignIn()
        {
            app.dismissKeyboard();
            app.WaitAndContinue(LoginButtonAutomationId).Tap();
        }
    }
}

我能找到的所有类似帖子都是关于未能在App Center上进行测试的，如果我因某种原因错过了与我的问题有关的帖子，请指出正确的方向。