1､使用Until和匿名函数的方法

var wait = new WebDriverWait(driver, new TimeSpan(0, 0, 30));
wait.IgnoreExceptionTypes(typeof(NoSuchElementException), typeof(ElementNotVisibleException));
var element = wait.Until(() => 
{
    var e = Driver.FindElement(By.Id("content-section"));
    if(e.Displayed)
        return e;
});

2､添加扩展方法WaitUntilVisible来判断

public static IWebElement WaitUntilVisible(
    this IWebDriver driver,
    By itemSpecifier,
    int secondsTimeout = 10)
{
    var wait = new WebDriverWait(driver, new TimeSpan(0, 0, secondsTimeout));
    var element = wait.Until<IWebElement>(driver =>
    {
        try
        {
            var elementToBeDisplayed = driver.FindElement(itemSpecifier);
            if(elementToBeDisplayed.Displayed)
            {
                return elementToBeDisplayed;
            }
            return null;
        }
        catch (StaleElementReferenceException)
        {
            return null;
        }
        catch (NoSuchElementException)
        {
            return null;
        }
    });
    return element;
}

调用扩展方法：

ChromeDriver driver = new ChromeDriver();
//...省略逻辑代码
element = driver.WaitUntilVisible(By.XPath("//input[@value='Save']"));

3､通过DotNetSeleniumExtras.WaitHelpers判断

1) Nuget安装引用DotNetSeleniumExtras.WaitHelpers

使用nuget搜索DotNetSeleniumExtras.WaitHelpers，并且导入命名空间。

相关文档：VS(Visual Studio)中Nuget的使用

或者

Install-Package DotNetSeleniumExtras.WaitHelpers

2) 判断是否显示的代码

var wait = new WebDriverWait(driver, new TimeSpan(0, 0, 30));
var element = wait.Until(SeleniumExtras.WaitHelpers.ExpectedConditions.ElementIsVisible(By.Id("content-section")));

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