c# - 我为什么可以将 IWebDriver 转换为 IJavaScriptExecutor？

Question

谁能解释一下这个“魔法”？

public interface IWebDriver : ISearchContext, IDisposable
{
    string CurrentWindowHandle { get; }
    string PageSource { get; }
    string Title { get; }
    string Url { get; set; }
    ReadOnlyCollection<string> WindowHandles { get; }

    void Close();
    IOptions Manage();
    INavigation Navigate();
    void Quit();
    ITargetLocator SwitchTo();
}

public interface ISearchContext
{
    IWebElement FindElement(By by);
    ReadOnlyCollection<IWebElement> FindElements(By by);
}

public interface IJavaScriptExecutor
{
    object ExecuteAsyncScript(string script, params object[] args);
    object ExecuteScript(string script, params object[] args);
}

怎么会

(this.Driver as IJavaScriptExecutor).ExecuteScript("console.log('wtf?')");

工作正常吗？

Answer 1

这是因为main implementation IWebDriver implements IJavaScriptExecutor 从而提供实现 of those methods .

您尚未提供显示如何实例化驱动程序的代码，但它们都继承自 RemoteWebDriver:示例是 ChromeDriver