C＃装饰类使用默认类版本的方法 [英] C# Decorator Class using Default Class Version of Method

问题描述

如果尝试装饰一个类，你如何保持与默认实现相同的方法？

How do you leave a method the same as the default implementation if trying to decorate a class?

例如，我正在尝试向IWebDriver接口添加一个属性的WebDriver类。

For example I am trying to add a property to a IWebDriver interface of the WebDriver class.

ie

public class MyWebDriver : IWebDriver
{
    private IWebDriver _driver;
    internal string _currentTest { get; set; }

    internal MyWebDriver(IWebDriver driver)
    {
        _driver = driver;
    }
}

Visual Studio IntelliSense让我实现了类（或接口）与一堆'抛出新的NotImplementedException（）; 作为默认WebDriver类方法的方法体。

Visual Studio IntelliSense had me implement the class (or interface) with a bunch of 'throw new NotImplementedException(); as the method body for the default WebDriver class methods.

ie

public IWebElement FindElement(By by)
{
    throw new NotImplementedException();
}

我的问题是如果我不想调整这些方法的行为我该怎么实现呢？我只是把它全部留在身体里，或者我必须举例说明（如果是这样，FindElement方法有一个返回类型和参数呢？）：

My question is if I don't want to adjust the behavior of these methods at all how do I implement that? Do I just leave it all as that line in the body or do I have to for example (if this is the case how would it be done for the FindElement method w/ a return type and parameter?):

public string CurrentWindowHandle
{
    get
    {
        return _driver.CurrentWindowHandle;
    }
}

public ReadOnlyCollection<string> WindowHandles
{
    get
    {
        return _driver.WindowHandles;
    }
}

public void Close()
{
    _driver.Close();
}

public void Quit()
{
    _driver.Quit();
}

我只是尝试向IWebDriver界面添加一个字符串变量来跟踪其中测试正在运行。

I am just trying to add a string variable to the IWebDriver interface to keep track of which test is running.

编辑：我找到了一个替代解决方案，我的初始问题（这是正确记录测试结果），不涉及实现任何新功能，

I found an alternative solution to my initial problem (which was proper logging of test results) that does not involve implementing any new functionality but rather placing try/catches in the correct places.

这个问题的解决方案可以在标记的答案以及下面的其他地方找到@AlexanderWinter显示一个例子

The solution to this question can be found in the marked answer as well as further below where @AlexanderWinter shows an example of an implementation including a way to retrieve data globally.

感谢您的帮助。

推荐答案

而不是扩展类，使用外部方式保存数据。您可以使用的是 系统.Runtime.CompilerServices.ConditionalWeakTable< TKey，TValue> 。

Instead of extending the class, use external means to save the data. Something you can use is System.Runtime.CompilerServices.ConditionalWeakTable<TKey, TValue>.

您可以使用以下方式：

class TestState
{
    public string Name { get; set; }
}

//initialization of some private field
ConditionalWeakTable<IWebDriver, TestState> myTestsByDriver = new ConditionalWeakTable<IWebDriver, TestState>();

...

//usage:
myTestsByDriver.GetOrCreateValue().Name = "My_First_Test";
//etc.

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