Method Id

dotnet/src/webdriver/By.cs:147–167

Gets a mechanism to find elements by their ID. The ID to find. A object the driver can use to find the elements. If is .

(string idToFind)

    /// <returns>A <see cref="By"/> object the driver can use to find the elements.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="idToFind"/> is <see langword="null"/>.</exception>
    public static By Id(string idToFind)
    {
        if (idToFind == null)
        {
            throw new ArgumentNullException(nameof(idToFind), "Cannot find elements with a null id attribute.");
        }

        string selector = EscapeCssSelector(idToFind);
        By by = new By(CssSelectorMechanism, "#" + selector);
        by.Description = "By.Id: " + idToFind;
        if (string.IsNullOrEmpty(selector))
        {
            // Finding multiple elements with an empty ID will return
            // an empty list. However, finding by a CSS selector of '#'
            // throws an exception, even in the multiple elements case,
            // which means we need to short-circuit that behavior.
            by.FindElementsMethod = (ISearchContext context) => new List<IWebElement>().AsReadOnly();
        }

        return by;
    }

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