Selenium Error: StaleElementReferenceException in C#

Question

I'm working on an application that downloads images from the internet in Selenium. However, I get the same error in the code seen in the picture and I cannot continue the process. This code, you can see the error in the image below.

        IWebDriver driver;
        int PictureID = 0;
        private void button1_Click(object sender, EventArgs e)
        {
            var ChromeService = ChromeDriverService.CreateDefaultService();
            driver = new ChromeDriver(ChromeService);
            driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(30);
            driver.Navigate().GoToUrl("https://oblivious212.artstation.com/");
            var Projects = driver.FindElements(By.ClassName("album-grid-item"));
            for(int i = 0; i < Projects.Count(); i++)
            {
                if (Projects.ElementAt(i) == null)
                {
                    continue;
                }
                Projects[i].Click();
                var Images = driver.FindElements(By.TagName("img"));
                for(int x = 0; x < Images.Count(); x++)
                {
                        PictureID++;
                        WebClient Downloader = new WebClient();
                        var ImageUrl = Images[x].GetAttribute("src");
                        var ImageName = Images[x].GetAttribute("alt");
                        Downloader.DownloadFile(ImageUrl, "C:\\Users\\DeLL\\Pictures\\Images\\" + ImageName + PictureID + ".jpg");
                }
            driver.Navigate().Back();
            }

Screenshot of exception when running in debug mode:

Error is here.

How do I solve this?

Conrad Albrecht · Accepted Answer · 2022-04-11 16:01:00Z

1

As soon as you navigate to a new page, which I guess is what your Projects[i].Click(); call does, any IWebElement objects you saved from an earlier page (oblivious212.artstation.com/) become "stale" and you can no longer use them. You must design your code around this fact; there are several ways you might do this.

Basically, while you're still on page oblivious212.artstation.com/, you need to save off any data you need from the IWebElement objects returned by your driver.FindElements(By.ClassName("album-grid-item")) call, into a local object, rather than saving the IWebElement objects themselves. Then, replace your Projects[i].Click(); call with code which uses your saved local data, rather than using the IWebElement objects themselves.

answered Apr 11, 2022 at 16:01

Conrad Albrecht

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