如何强制继承类在其构造函数中实现方法

本文关键字：构造函数 实现 方法 何强制 继承 | 更新日期: 2023-09-27 18:08:11

我遇到的问题是，我有一堆继承自父类(BasePage)的类(页面)。每当初始化子类时，还需要运行一个名为WaitForLoadingToStop()的方法。我如何继承这个方法和它的实现到我的子类的构造函数?

这是我需要改变的，因为它在所有地方都是重复的，因此，我希望在创建类时自动继承并执行它。

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

这是一个样例子类，我有另外10个像这样的

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

下面是我的BasePage类

    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']")));
    }
}

如何强制继承类在其构造函数中实现方法

从基类实现BasePageThatWaitsForLoadingToStop继承，它在构造函数中为您完成工作。唯一剩下的样板代码是传递特定实现的构造函数参数(例如StudentAssesmentPage到这个基类)

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();
     }
}

你可以像下面这样简单地调用它，它会自动为你工作:

var assPage = new StudentAssesmentPage(Driver);

但是，请注意，从测试的角度来看，在构造函数中工作并不理想。

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