仅在Visual Studio 2015的调试模式下引发WebDriverWait异常

Question

I was wondering if anyone else has encountered a similar problem like this or has experiences using WebDriverWait?

If they would know why I get a NoSuchElementException which seems to only be thrown in debug mode . I don't get this error being thrown when running the test in normal runtime.

I am able to click continue and step past the exception also.

Answer 1

I believe this is a quirk of Visual Studio's debug mode. Essentially in debug mode exceptions are sometimes treated as a break even if it is appropriately handled within a try/catch.

Remember when you pass a func to Until() in WebDriver, that func is executed internally within a try. VS is likely hitting the (handled) exception in that method, which is why you do not see it during normal running.

See here for more info.

Answer 2

Here is a workaround, for example if you are trying to find an element:

wait.Until(driver => driver.FindElement(
    By.CssSelector(".cssClass"))
);

You can do this:

wait.Until(driver => driver.FindElements(
    By.CssSelector(".cssClass")).FirstOrDefault()
);

And it will work on both release and debug environments.