Method ClassName

dotnet/src/webdriver/By.cs:238–259

Gets a mechanism to find elements by their CSS class. The CSS class to find. A object the driver can use to find the elements. If an element has many classes then this will match against each of them. For example if the value is "one two onone", then the following values for the className parame

(string classNameToFind)

    /// className parameter will match: "one" and "two".</remarks>
    /// <exception cref="ArgumentNullException">If <paramref name="classNameToFind"/> is null.</exception>
    public static By ClassName(string classNameToFind)
    {
        if (classNameToFind == null)
        {
            throw new ArgumentNullException(nameof(classNameToFind), "Cannot find elements when the class name expression is null.");
        }

        string selector = "." + EscapeCssSelector(classNameToFind);
        if (selector.Contains(" "))
        {
            // Finding elements by class name with whitespace is not allowed.
            // However, converting the single class name to a valid CSS selector
            // by prepending a '.' may result in a still-valid, but incorrect
            // selector. Thus, we short-circuit that behavior here.
            throw new InvalidSelectorException("Compound class names not allowed. Cannot have whitespace in class name. Use CSS selectors instead.");
        }

        return new By(CssSelectorMechanism, selector)
        {
            Description = "By.ClassName[Contains]: " + classNameToFind
        };
    }

    /// <summary>
    /// Gets a mechanism to find elements by a partial match on their link text.