如何強制繼承類在其構造函數中實現方法？

Question

我遇到的問題是我有一堆從父類 (BasePage) 繼承的類 (Pages)。 任何時候初始化子類時，我還需要運行一個名為 WaitForLoadingToStop() 的方法。 我如何繼承這個方法並將其實現到我的子類的構造函數中？

這是我需要更改的，因為它到處都是重復的，因此，我希望在創建類時自動繼承和執行它。

        var assPage = new StudentAssesmentPage(Driver);
        assPage.WaitForLoadingToStop();

這是一個示例子類，我還有 10 個看起來像這樣

    public class StudentAssesmentPage : BasePage<StudentAssesmentPageObjectRepository>
{
    public StudentAssesmentPage(IWebDriver driver) : base(driver, new StudentAssesmentPageObjectRepository(driver))
    {}
}

下面是我的 BasePage 類

    public abstract class BasePage<TObjectRepository> where TObjectRepository : BasePageObjectRepository
{
    protected WebDriverWait Wait { get; }
    protected IWebDriver Driver { get; }
    protected ApplicationUrls ApplicationUrls { get; }
    public IJavaScriptExecutor JavascriptExecutor { get; }
    protected Actions UserInteractions { get; private set; }

    protected By _loadingSpinnerLocator = By.Id("spinner");
    private readonly double LOADING_SPINNER_TIMEOUT = 60;
    private TObjectRepository _objectRepository;

    public BasePage(IWebDriver driver, TObjectRepository repository)
    {
        Driver = driver;
        _objectRepository = repository;
        UserInteractions = new Actions(Driver);
        ApplicationUrls = new ApplicationUrls();
        Wait = new WebDriverWait(Driver, TimeSpan.FromSeconds(GetPageTimeout()));
        JavascriptExecutor = Driver as IJavaScriptExecutor;
    }

    internal TObjectRepository ObjectRepository
    {
        get { return _objectRepository; }
    }

    protected bool WaitForLoadingToStop(int secondsToSleep = 5)
    {
        var sleepTime = TimeSpan.FromSeconds(secondsToSleep);
        Reporter.Debug($"{Helpers.GetCurrentMethodName()}. Going to sleep for:{sleepTime.Seconds}");
        Thread.Sleep(sleepTime);
        Reporter.Debug($"Now, going to wait for loading spinner for:{LOADING_SPINNER_TIMEOUT} seconds.");
        var basePageWait = new WebDriverWait(Driver, TimeSpan.FromSeconds(LOADING_SPINNER_TIMEOUT));
        basePageWait.Message =
            $"Waited for {LOADING_SPINNER_TIMEOUT}sec for the spinner. However, it took longer than that for the application to load.";


        return basePageWait.Until(ExpectedConditions.InvisibilityOfElementLocated(By.XPath("//img[@src='/Content/images/spinner.gif']")));
    }
}

Answer 1

只需從一個基類實現BasePageThatWaitsForLoadingToStop繼承，它在構造函數中為您完成工作。 剩下的唯一樣板代碼是傳遞特定實現的構造函數參數（例如StudentAssesmentPage到這個基類）

public class StudentAssesmentPage : BasePageThatWaitsForLoadingToStop
{
     public StudentAssesmentPage(IWebDriver driver) : base(driver, new StudentAssesmentPageObjectRepository(driver)) // this is the only boilerplate code that is left
     {

     }
}

public class BasePageThatWaitsForLoadingToStop : BasePage<StudentAssesmentPageObjectRepository>
{
     public BasePageThatWaitsForLoadingToStop(IWebDriver driver) : base(driver, new StudentAssesmentPageObjectRepository(driver))
     {
         base.WaitForLoadingToStop();
     }
}

然后您可以簡單地按如下方式調用它，它會自動為您完成工作：

var assPage = new StudentAssesmentPage(Driver);

但是，請注意，從測試的角度來看，在構造函數中進行工作並不理想。

Answer 2

public class StudentAssesmentPage : BasePage<StudentAssesmentPageObjectRepository>
{
    public StudentAssesmentPage(IWebDriver driver) : base(driver, new StudentAssesmentPageObjectRepository(driver))
    {
        base.WaitForLoadingToStop();
    }
}