因为我使用一个已经找到的IWebElement来分离页面元素定义和页面测试场景，所以可以这样做:

public static void WaitForElementToBecomeVisibleWithinTimeout(IWebDriver driver, IWebElement element, int timeout)
{
    new WebDriverWait(driver, TimeSpan.FromSeconds(timeout)).Until(ElementIsVisible(element));
}

private static Func<IWebDriver, bool> ElementIsVisible(IWebElement element)
{
    return driver => {
        try
        {
            return element.Displayed;
        }
        catch(Exception)
        {
            // If element is null, stale or if it cannot be located
            return false;
        }
    };
}

你可以使用下面的方法

WebDriverWait wait = new WebDriverWait(driver, new TimeSpan(0,0,5));
wait.Until(ExpectedConditions.ElementToBeClickable((By.Id("login")));

显式等

public static  WebDriverWait wait = new WebDriverWait(driver, 60);

例子:

wait.until(ExpectedConditions.visibilityOfElementLocated(UiprofileCre.UiaddChangeUserLink));

// Wait up to 5 seconds with no minimum for a UI element to be found
WebDriverWait wait = new WebDriverWait(_pagedriver, TimeSpan.FromSeconds(5));
IWebElement title = wait.Until<IWebElement>((d) =>
{
    return d.FindElement(By.ClassName("MainContentHeader"));
});

我看到许多解决方案已经张贴，工作很棒!但是，为了防止有人需要其他东西，我想我将发布两个我个人在Selenium c#中使用的解决方案来测试是否存在元素!

public static class IsPresent
{
    public static bool isPresent(this IWebDriver driver, By bylocator)
    {

        bool variable = false;
        try
        {
            IWebElement element = driver.FindElement(bylocator);
            variable = element != null;
        }
        catch (NoSuchElementException){

        }
        return variable;
    }
}

这是第二个:

public static class IsPresent2
{
    public static bool isPresent2(this IWebDriver driver, By bylocator)
    {
        bool variable = true;
        try
        {
            IWebElement element = driver.FindElement(bylocator);
        }
        catch (NoSuchElementException)
        {
            variable = false;
        }
        return variable;
    }
}

试试下面的代码:

 New WebDriverWait(driver, TimeSpan.FromSeconds(10)).Until(Function(d) d.FindElement(By.Id("controlName")).Displayed)