硒C#代码工作，但需要等待或延迟

Question

通过添加while（ele==null）循环，我让代码大部分时间都在调试器之外运行和工作。非常难看。这让我认为我需要使用包装器覆盖FindElements（）函数，但不知道如何这样做来增加一些延迟。Selenium Webdrive中的显式等待findElements有一个示例，但它是用JavaScript编写的。我把这个示例放在下面的代码中。有人能指导我吗？

        public void WriteAPost()
        {
           ele = driver.FindElements(By.CssSelector(".a8c37x1j.ni8dbmo4.stjgntxs.l9j0dhe7.ltmttdrg.g0qnabr5.ojkyduve")).FirstOrDefault(x => x.Text == "Create Post");

            while(ele == null)
            {
                ele = driver.FindElements(By.CssSelector(".a8c37x1j.ni8dbmo4.stjgntxs.l9j0dhe7.ltmttdrg.g0qnabr5.ojkyduve")).FirstOrDefault(x => x.Text == "Create Post");
            }

            ele.Click();
            Thread.Sleep(3000);

            ele = driver.SwitchTo().ActiveElement();

            PClipboard.SetText("Post text to use for Text Area");
            ele.SendKeys(OpenQA.Selenium.Keys.Control + 'v');

            Thread.Sleep(3000);

            ele = driver.FindElements(By.XPath("//div[@role = 'button']")).FirstOrDefault(x => x.Text == "Post");

            while (ele == null)
            {
                ele = driver.FindElements(By.XPath("//div[@role = 'button']")).FirstOrDefault(x => x.Text == "Post");
            }

            ele.Click();
            Thread.Sleep(3000);

            driver.Quit();
     }

    static class PClipboard
    {
        public static void SetText(string p_Text)
        {
            Thread STAThread = new Thread(
                delegate ()
                {
                    // Use a fully qualified name for Clipboard otherwise it
                    // will end up calling itself.
                    System.Windows.Forms.Clipboard.SetText(p_Text);
                });
            STAThread.SetApartmentState(ApartmentState.STA);
            STAThread.Start();
            STAThread.Join();
        }
    }
}

// Javascript FindElements() wrapper

    /// <summary>
    /// Allows you to execute the FindElements call but specify your own timeout explicitly for this single lookup
    /// </summary>
    /// <remarks>
    /// If you want no timeout, you can pass in TimeSpan.FromSeconds(0) to return an empty list if no elements match immediately. But then you may as well use the original method
    /// </remarks>
    /// <param name="driver">The IWebDriver instance to do the lookup with</param>
    /// <param name="findBy">The By expression to use to find matching elements</param>
    /// <param name="timeout">A timespan specifying how long to wait for the element to be available</param>
    public static ReadOnlyCollection<IWebElement> FindElements(this IWebDriver driver, By findBy, TimeSpan timeout)
    {
        var wait = new WebDriverWait(driver, timeout);
        return wait.Until((d) =>
        {
            var elements = d.FindElements(findBy);
            return (elements.Count > 0)
                ? elements
                : null;
        });
    }

Answer 1

我只是不知道在代码的什么地方等待。

就个人而言，我的Selenium代码充满了“测试失败报告”测试和尝试捕获块，这些测试块报告了故障发生的位置。如果以这种方式对代码进行建模，它应该会缩小问题的范围，并提示您需要等待的位置。

Answer 2

您可以等待某个条件得到满足:

new WebDriverWait(driver, timeout).Until(ExpectedConditions.ElementExists((By.Id(id))));

或者您可以隐式等待：

driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(timeInSeconds);