Selenium C＃wait.until（expectedconditions）…函数无法在屏幕上找到对象/元素

Question

I am new to using selenium Webdriver and writing c# . I was using lots of thread.sleep() commands in my script to make sure Selenium didn't try and click too quick. Upon lots of research I found this is frowned upon and there are "better" ways to do it, so I started to use:-

wait.Until(ExpectedConditions.ElementToBeClickable(By.Id("FieldId")));

Wait is defined in another class as:-

wait = new WebDriverWait(driver, new TimeSpan(0, 0, 0, 10));

I can only get this to work 2/10 times of running the script without getting :

No such element exception: cannot locate element......

I have tons of examples of this problem now I have stopped using thread.sleep . After lots of research I always come to find this is the advised way but it seems totally unreliable. Have I missed something? The element is always there after 2 seconds and the error occurs before 10sec has passed. I have read at least 10 other posts which sound similar but none of them have a solution which works...except Thread.Sleep(5000) !

Answer 1

Try adding the NoSuchElementException type to the IgnoreExceptionTypes of the waiter after you create it.

wait = new WebDriverWait(driver, new TimeSpan(0, 0, 0, 10));
wait.IgnoreExceptionTypes(typeof(NoSuchElementException));
wait.Until(ExpectedConditions.ElementToBeClickable(By.Id("FieldId")));

In general, if the waiter is returning before the timeout you indicate is expired, it's because an exception occurred that is not currently ignored.

The WebDriverWait class is derived from the DefaultWait class. Both of which you can review on github which I found really helpful in understanding how to use it.