方法的通用类型参数

How do I create a method that accepts generic parameters?

如何创建接受通用参数的方法?

Ok, here's the exact thing I'm working on:

好的,这是我正在做的事情:

The 2 methods below differ only by By.Id or By.LinkText

下面的两种方法仅有By.Id或By.LinkText

    private IWebElement FindElementById(string id)
    {
        WebDriverWait wait = new WebDriverWait(_driver, TimeSpan.FromSeconds(40));
        IWebElement we = null;

        wait.Until<bool>(x =>
        {
            we = x.FindElement(By.Id(id));
            bool isFound = false;

            try
            {
                if (we != null)
                    isFound = true;
            }
            catch (StaleElementReferenceException)
            {
                we = x.FindElement(By.Id(id));
            }

            return isFound;
        });

        return we;
    }

    private IWebElement FindElementByLinkText(string id)
    {
        WebDriverWait wait = new WebDriverWait(_driver, TimeSpan.FromSeconds(40));
        IWebElement we = null;

        wait.Until<bool>(x =>
        {
            we = x.FindElement(By.LinkText(id));
            bool isFound = false;

            try
            {
                if (we != null)
                    isFound = true;
            }
            catch (StaleElementReferenceException)
            {
                we = x.FindElement(By.LinkText(id));
            }

            return isFound;
        });

        return we;
    }

1 个解决方案

#1

Since the Selenium By functions are static member functions conforming to the type signature of a Func<string, By>, you could easily modify your code like this:

由于Selenium By函数是符合Func 类型签名的静态成员函数,因此您可以轻松地修改代码,如下所示: ,by>

private IWebElement FindElementById(string id)
{
    return FindElementBy(By.Id, id);
}

private IWebElement FindElementByLinkText(string linkText)
{
    return FindElementBy(By.LinkText, linkText);
}

private IWebElement FindElementBy(Func<string, By> finder, string argument)
{
    WebDriverWait wait = new WebDriverWait(_driver, TimeSpan.FromSeconds(40));
    IWebElement we = null;

    wait.Until<bool>(x =>
    {
        we = x.FindElement(finder(argument));
        bool isFound = false;

        try
        {
            if (we != null)
                isFound = true;
        }
        catch (StaleElementReferenceException)
        {
            we = x.FindElement(finder(argument));
        }

        return isFound;
    });

    return we;
}