C＃中WebDriver的线程安全＃

Question

我尝试在C＃中搜索IWebDriver的线程安全，并找到使用ThreadLocal的答案。但是当我运行我的测试时，它总是在我的代码中返回比IWebDriver i实例更多的东西，它在运行新测试后发生，我也尝试在IWebDriver.Quit（）之后使用ThreadLocal.Dispose（）并且我得到异常System.ObjectDisposedException : Cannot access a disposed object. Object name: 'The ThreadLocal object has been disposed.'。希望有人在C＃中使用WebDriver的线程安全工具给我提供建议。

以下是我返回IWebDriver的代码：

public class DriverFactory
{
     IWebDriver webDriver;        
     ThreadLocal<IWebDriver> ThreadDriver;
    private DriverFactory ()
    {

        //Do not instance out side
    }
    public static DriverFactory instance = new DriverFactory();
    public static DriverFactory Instance ()
    {
        return instance;
    }
    /// <summary>
    /// This method is use for return WebDriver
    /// </summary>
    public IWebDriver WebDriver
    {
        get
        {
            if(ThreadDriver.Value==null)
            //if (webDriver == null)
            {
                throw new NullReferenceException("The driver instance was not initialized. You should first call the method startDriver.");
            }
            return ThreadDriver.Value;
            //return webDriver;
        }

        private set
        {
            webDriver = value;
        }
    }      
    public void StartDriver (DriverType driverType)
    {
        switch (driverType)
        {               
            case DriverType.Chrome:
                ThreadDriver = new ThreadLocal<IWebDriver>(() =>
                {
                    return new ChromeDriver(Utils.DriverHelper.DriverPath());  
                },true);                 

                break;               
            default:
                break;
        }           
    }
    /// <summary>
    /// This method is use for close WebDriver
    /// </summary>
    public void CloseWebDriver ()
    {
        //WebDriver.Close();
        //WebDriver.Quit();
        //WebDriver = null;
        //ThreadDriver.Value.Close();
        ThreadDriver.Value.Quit();
        ThreadDriver.Values.Clear();     
    }            
}

这是我运行测试的代码，我在运行paralell for testParalell1和testParalell2时遇到了问题：

[TestFixture(DriverType.Chrome)]
[TestFixture(DriverType.Chrome)]
[TestFixture(DriverType.Chrome)]
[TestFixture(DriverType.Chrome)]
[Parallelizable(ParallelScope.Self)]
class ChangeDateTime
{
    protected DriverType driverType;
    public ChangeDateTime (DriverType type)
    {
        this.driverType = type;
    }        

    [Test]
    public void testParalell1 ()
    {
        DriverFactory.StartDriver(driverType);
        IWebDriver driver = DriverFactory.WebDriver;
        driver.Url = "http://www.google.com";
        Console.WriteLine(driver.Title);
        Assert.AreEqual(driver.Title, "Google");
        DriverFactory.CloseWebDriver();
    }

    [Test]
    public void testParalell2 ()
    {
        DriverFactory.StartDriver(driverType);
        IWebDriver driver = DriverFactory.WebDriver;
        driver.Url = "http://www.google.com";
        Console.WriteLine(driver.Title);
        Assert.AreEqual(driver.Title, "Google");
        DriverFactory.CloseWebDriver();
    }      

}