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

 WebDriverWait wait = new WebDriverWait(_firefoxDriver, TimeSpan.FromSeconds(10));//设置超时时间
 var isFInd = wait.Until(contion =>
       {
           try
           {
                //寻找元素
                _firefoxDriver.FindElement(By.ClassName("c-icon-shape-hover")).Click();
                //_firefoxDriver.FindElement(By.XPath(xpath)).Click();
                return true;
           }
           catch (Exception e)
           {
                return false;
           }
        });
 if (!isFInd)
        throw new Exception("Cant' Find Click");