错误System.PlatformNotSupportedException：此平台不支持操作

Question

我的目的是在浏览器堆栈上运行UI自动化脚本 我试图在浏览器堆栈上运行一个简单的示例测试 - 但是我遇到了错误 消息：System.PlatformNotSupportedException：此平台不支持操作 完整堆栈跟踪

System.Net.SystemWebProxy.GetProxy(Uri destination) at System.Net.ServicePointManager.ProxyAddressIfNecessary(Uri& address, IWebProxy proxy) at System.Net.ServicePointManager.FindServicePoint(Uri address, IWebProxy proxy) at System.Net.HttpWebRequest.get_ServicePoint() at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(H‌​ttpRequestInfo requestInfo) –

我的代码如下所示：

using System;
using OpenQA.Selenium;
using OpenQA.Selenium.Remote;
using NUnit;
using NUnit.Framework;

namespace SeleniumTest
{
   [TestFixture]
   [Parallelizable]
   public class Program
   {
      IWebDriver _driver;

      [SetUp]
      public void init()
      {
         DesiredCapabilities capability = DesiredCapabilities.Chrome();
         capability.SetCapability("browserstack.user", "<BrowserStack-Username>");
         capability.SetCapability("browserstack.key", "<BrowserStack-Key>");
         capability.SetCapability("browser", "Chrome");
         capability.SetCapability("browser_version", "52.0");
         capability.SetCapability("os", "Windows");
         capability.SetCapability("os_version", "7");

         _driver = new RemoteWebDriver(
           new Uri("http://hub-cloud.browserstack.com/wd/hub/"), capability
         );

      }

      [Test]

      public void BSTTest4()
      {
         _driver.Navigate().GoToUrl("http://www.google.com");
         Console.WriteLine(_driver.Title);

         IWebElement query = _driver.FindElement(By.Name("q"));
         query.SendKeys("Browserstack");
         query.Submit();
         Console.WriteLine(_driver.Title);

      }

      [TearDown]
      public void cleanup()
      {
         _driver.Quit();

      }
   }
}