如何正确设置edgedriver？得到以下错误

我在C＃中使用NUnit和Selenium来构建一个包含在多个浏览器上运行多个测试用例的框架 . 在这种情况下，也支持Microsoft Edge . 当我设置我的测试时，chrome和firefox正确运行但是edge会出现以下错误：

OpenQA.Selenium.WebDriverException：抛出了一个带有空响应的异常，向URL http：// localhost：55992 / session发送HTTP请求到远程WebDriver服务器 . 异常的状态是ReceiveFailure，消息是：基础连接已关闭：接收上发生意外错误 . ----> System.Net.WebException：底层连接已关闭：接收上发生意外错误 . ----> System.IO.IOException：无法从传输连接读取数据：远程主机强制关闭现有连接 . ----> System.Net.Sockets.SocketException：远程主机[2018]强制关闭现有连接 . 06. 17. 17:08:22警告]在OpenQA.Selenium.Remium.Selenium.Remote.HttpCommandExecutor.Execute（命令commandToExecute）的OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest（HttpRequestInfo requestInfo），OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute（命令commandToExecute）在OpenQA.Selenium.mlen上的OpenQA.Selenium.Remote.RemoteWebDriver.Execute（String driverCommandToExecute，Dictionary`2参数） . 在OpenQA.Selenium.Remote.RemoteWebDriver..ctor（ICommandExecutor commandExecutor）中的OpenCA.Selenium.Remote.RemoteWebDriver.StartSession（ICapabilities desiredCapabilities）位于OpenQA.Selenium.Edge.EdgeDriver..ctor（）的OpenQA.Selenium.Edge.EdgeDriver..ctor（EdgeOptions选项），位于C：\ SeleniumNUnit中的SeleniumNUnit.Tests.WebDriverFactory.EdgeDriver（）中的ICapabilities desiredCapabilities - Copy SeleniumNUnit.Tests \ Class1.cs：SeleniumNUnit.Tests.WebDriverFactory.WebDriver（BrowserType类型）中的第70行，位于C：\ SeleniumNUnit - Copy \ SeleniumNUnit.Tests \ Class1.cs：第50行，位于SeleniumNUnit.Tests.WebDriverFactory..ctor （BrowserType类型）在C：\ SeleniumNUnit中 - 复制\ SeleniumNUnit.Tests \ Class1.cs：第24行在SeleniumNUnit.DemoTest..ctor（BrowserType浏览器）中的C：\ SeleniumNUnit - Copy \ SeleniumNUnit \ Class1.cs：第12行 - OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest（HttpRequestInfo requestInfo）中的System.Net.HttpWebRequest.GetResponse（）中的-WebException - System.Net.Sockets.NetworkStream.Read上的--IOException（Byte []缓冲区，Int32偏移量，Int32大小）在System.Net.Connection.SyncRead（HttpWebRequest请求，布尔userRetrievedStream，布尔探测器读取）的System.Net.PooledStream.Read（Byte []缓冲区，Int32偏移量，Int32大小）处 - System.Net.Sockets.Socket处的--SocketException System.Net.Sockets.NetworkStream.Read（Byte []缓冲区，Int32偏移量，Int32大小）的.Receive（Byte []缓冲区，Int32偏移量，Int32大小，SocketFlags socketFlags）

我试图查找这个特定的错误，我得到的最接近的是远程驱动程序尝试发送HTTP请求，在这种情况下失败 . 由于Chrome和FF运行正常，我不知道Edge出了什么问题 .

WebDriverFactory：

using NUnit.Framework;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Firefox;
using OpenQA.Selenium.IE;
using WebDriverManager;
using WebDriverManager.DriverConfigs.Impl;
using System.IO;
using OpenQA.Selenium.Edge;
using System;

namespace SeleniumNUnit.Tests
{
    /// <summary>
    /// A static factory object for creating WebDriver instances
    /// </summary>
    public class WebDriverFactory
    {
        public static string path = "C:\\Drivers\\";
        public IWebDriver Driver;

    protected WebDriverFactory(BrowserType type)
    {
        Driver = WebDriver(type);
    }

    [OneTimeTearDown]
    public void TestFixtureTearnDown()
    {
        Driver.Quit();
    }

    /// <summary>
    /// Types of browser available for proxy examples.
    /// </summary>
    public enum BrowserType
    {
        IE,
        Chrome,
        Firefox,
    }

    public static IWebDriver WebDriver(BrowserType type)
    {
        IWebDriver driver = null;

        switch (type)
        {
            case BrowserType.IE:
                driver = EdgeDriver();
                break;
            case BrowserType.Firefox:
                driver = FirefoxDriver();
                break;
            case BrowserType.Chrome:
                driver = ChromeDriver();
                break;
        }

        return driver;
    }

    /// <summary>
    /// Creates Internet Explorer Driver instance.
    /// </summary>
    /// <returns>A new instance of IEDriverServer</returns>
    private static IWebDriver EdgeDriver()
    {
        new DriverManager().SetUpDriver("https://download.microsoft.com/download/F/8/A/F8AF50AB-3C3A-4BC4-8773-DC27B32988DD/MicrosoftWebDriver.exe", Path.Combine(path, "MicrosoftWebDriver.exe"), "MicrosoftWebDriver.exe");
        IWebDriver driver = new EdgeDriver();   
        return driver;
    }

    /// <summary>
    /// Creates Firefox Driver instance.
    /// </summary>
    /// <returns>A new instance of Firefox Driver</returns>
    private static IWebDriver FirefoxDriver()
    {
        new DriverManager().SetUpDriver(new FirefoxConfig());
        FirefoxOptions options = new FirefoxOptions();
        IWebDriver driver = new FirefoxDriver(options);
        return driver;
    }


    /// <summary>
    /// Creates Chrome Driver instance.
    /// </summary>
    /// <returns>A new instance of Chrome Driver</returns>
    private static IWebDriver ChromeDriver()
    {
        new DriverManager().SetUpDriver("https://chromedriver.storage.googleapis.com/2.40/chromedriver_win32.zip", Path.Combine(path, "chromedriver.exe"), "chromedriver.exe");
        ChromeOptions chromeOptions = new ChromeOptions();
        IWebDriver driver = new ChromeDriver(chromeOptions);
        return driver;
    }


}
}

TestCode：

using System;
using NUnit.Framework;
namespace SeleniumNUnit
{
    [TestFixture(SeleniumNUnit.Tests.WebDriverFactory.BrowserType.Chrome)]
    [TestFixture(SeleniumNUnit.Tests.WebDriverFactory.BrowserType.Firefox)]
    [TestFixture(SeleniumNUnit.Tests.WebDriverFactory.BrowserType.IE)]
    public class DemoTest : SeleniumNUnit.Tests.WebDriverFactory
    {
        public DemoTest(SeleniumNUnit.Tests.WebDriverFactory.BrowserType browser)
        : base(browser)
    {

    }

    [OneTimeSetUp]
    public void SetUpEnvironment()
    {
        Driver.Navigate().GoToUrl("http://google.com");

    }

    [Test]
    public void validateTitle()
    {
        Assert.That(Driver.Title.Contains("Google"));
    }

    [OneTimeTearDown]
    public void tearDown()
    {
        Driver.Quit();
        Driver.Dispose();
    }
}
}