c# - 如何使用类属性使用扩展方法

Question

我有一个 Selenium 类

 public class Driver
    {
        public IWebDriver Instance { get; set; }
        public  string baseURL;

        public void Initialize()
        {
            Instance = new FirefoxDriver();
            baseURL = "http://localhost:49730/";
            Instance.Manage().Timeouts().ImplicitlyWait(TimeSpan.FromSeconds(5));
        }

        public void Wait(TimeSpan timespan)
        {
            Thread.Sleep((int)(timespan.TotalSeconds * 1000));
        }

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

我还创建了一个显式等待的扩展方法

public static class WebDriverExtensionMethods

    public static class WebDriverExtensionMethods
    {
        public static IWebElement WaitAndFindElement(this Driver driver, By by, int timeoutInSeconds)
        {
            if (timeoutInSeconds > 0)
            {
                var wait = new WebDriverWait(driver.Instance, TimeSpan.FromSeconds(timeoutInSeconds));
                return wait.Until(drv => drv.FindElement(by));
            }
            return driver.Instance.FindElement(by);
        }
    }

如何使用 Driver 类属性调用方法？ IE。我想调用 driver.Instance.WaitAndFindElement

Answer 1

也许你可以在 IWebDriver 上写一个扩展，而不是驱动程序:

public static class WebDriverExtensionMethods
{
    public static IWebElement WaitAndFindElement(this IWebDriver driver, By by, int timeoutInSeconds)
    {
        if (timeoutInSeconds > 0)
        {
            var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(timeoutInSeconds));
            return wait.Until(drv => drv.FindElement(by));
        }
        return driver.FindElement(by);
    }
}

顺便说一句，这样您只能在驱动程序的实例属性上调用它。否则，除了已有的扩展之外，您还可以添加此扩展。甚至可以提取通用代码:

public static class WebDriverExtensionMethods
{
    private static IWebElement WaitAndFindElementInternal(IWebDriver webDriver, By by, int timeoutInSeconds)
    {
        if (timeoutInSeconds > 0)
        {
            var wait = new WebDriverWait(webDriver, TimeSpan.FromSeconds(timeoutInSeconds));
            return wait.Until(drv => drv.FindElement(by));
        }
        return webDriver.FindElement(by);
    }

    public static IWebElement WaitAndFindElement(this Driver driver, By by, int timeoutInSeconds)
    {
        return WaitAndFindElementInternal(driver.Instance, by, timeoutInSeconds);
    }

    public static IWebElement WaitAndFindElement(this IWebDriver driver, By by, int timeoutInSeconds)
    {
        return WaitAndFindElementInternal(driver, by, timeoutInSeconds);
    }
}

这样您就可以调用 driver.Instance.WaitAndFindElement 以及 driver.WaitAndFindElement。