C # 硒“预期条件已过时”

Check which version of the Selenium.Support and Selenium.WebDriver NuGet package you have installed.

I got the same issue now with the latest version, 3.11.2. I downgraded to 3.10.0 and it fixed the problem.

How to resolve this with the latest version of Selenium.

Using NuGet, search for DotNetSeleniumExtras.WaitHelpers, and import that namespace into your class. Now you can do this:

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

And the warning in the IDE will be gone.

If you don't want to download an extra NuGet package, it is quite easy to declare your own function (or condition), especially using a lambda expression, e.g.

var wait = new WebDriverWait(driver, new TimeSpan(0, 0, 30));
var element = wait.Until(condition =>
{
try
{
var elementToBeDisplayed = driver.FindElement(By.Id("content-section"));
return elementToBeDisplayed.Displayed;
}
catch (StaleElementReferenceException)
{
return false;
}
catch (NoSuchElementException)
{
return false;
}
});

This is also very versatile, since it is now possible to evaluate any kind of Boolean expression.

It's very simple. Just change Wait.Until(ExpectedConditions.ElementIsVisible(By.Id("content-section")));

to

Wait.Until(c => c.FindElement(By.Id("content-section")));

The answers to change to an anonymous function is the most correct one. Or write your own class of your own, needed, wait conditions.

An example of using an anonymous function for the explicit scenario above would be something like:

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;
});

And at that point, the function itself could be off on its own in some class in your solution that you can call. The nice thing with this is that you can modify as needed; I have seen several cases where really poorly made websites end up breaking how the ExpectedConditions work, and that was solved with the team writing our own function.

As per the C# contributor:

With respect to ExpectedConditions, again, this was an addition that was created in .NET solely because "Java has it." At the time the ExpectedConditions class in Java was created, the syntax for creating a lambda function (or something that acted like one) was particularly arcane and difficult to understand. In that case, a helper class made lots of sense for the Java bindings. However, C# isn't Java. In C#, the syntax for creating lambda functions ("anonymous methods" in the language of Microsoft's documentation) has been well understood by C# developers for many years, and is a standard tool in their arsenal.

In this case, the question of code verbosity does have some merit, but since wait conditions are rarely one-size-fits-all, it would be a much cleaner approach for users to develop their own conditions class that has the wait conditions they're interested in. This, however, is something users have an aversion to. Additionally, the thought of a 'standard' collection of implementations of specific wait conditions seems to be a good idea on its face, but there is a great deal of variation on the way users want any given condition to work. Having a collection of wait conditions might be a good thing, but the Selenium project is not the place for it.

Rantings of a Selenium Contributor

NuGet is required - DotNetSeleniumExtras.WaitHelpers

WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
wait.Until(SeleniumExtras.WaitHelpers.ExpectedConditions.ElementToBeClickable(By.XPath("")));

I just demonstrated the element clickable event. Similarly, other events can be used with the required parameters.

Based on Rob F.'s answer, I added extension methods to my project. (Actually I added two, WaitUntilVisible(...) and WaitUntilClickable(...).)

These return the element, instead of a bool, so it is more like the Wait.Until(ExpectedConditions...)

// use: element = driver.WaitUntilVisible(By.XPath("//input[@value='Save']"));
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;
}

The following C# code works for me:

new WebDriverWait(webDriver, TimeSpan.FromSeconds(10)).Until(c => c.FindElement(By.Id("name")));

You can use the NuGet package Gravity.Core - it is maintained by Gravity API community and it contains A LOT more than just the ExpectedConditions class.

How to use

1. Download the NuGet using NuGet package manager.
2. Add using OpenQA.Selenium.Extensions