c# run selenium browsers in parallel

Question

I'm trying to run 2 chrome browser instances with selenium webdriver library. However Even if these two browsers were initiated separately and are in separate threads, the code controls and manipulates only one browser.

The code for creating a chrome browser and perform the testing

    static void test(string url)
    {
        ChromeDriver driver = BrowserWorker.GetChromeBrowser(false);

        driver.Navigate().GoToUrl(url);

    }

The "BrowserWorkser.GetChromeBrowser" function is to return a customized chrome browser instance:

    public static ChromeDriver GetChromeBrowser()
    {
        var chromeoptions = new ChromeOptions();
        chromeoptions.AddArguments("--disable-notifications");
        chromeoptions.AddArguments("--no-sandbox");
        chromeoptions.AddArguments("--disable-dev-shm-usage");
        chromeoptions.UnhandledPromptBehavior = UnhandledPromptBehavior.Dismiss;
        chromeoptions.AddArguments("--remote-debugging-port=9222");
        
        var chromeDriverService = ChromeDriverService.CreateDefaultService(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));
        chromeDriverService.HideCommandPromptWindow = true;

        ChromeDriver browser = null;
        int nCount = 0;
        while (browser == null && nCount < 3)
        {
            try
            {
                browser = new ChromeDriver(chromeDriverService, chromeoptions, TimeSpan.FromSeconds(180));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error initializing chrome browser: " + ex.Message);
            }
            nCount++;
        }

        return browser;
    }

First method:

        var t1 = new Thread(() => test("https://www.google.com/"));
        var t2 = new Thread(() => test("https://www.bing.com/"));           
        t1.Start();
        t2.Start();

Second method, changed the signature of "test(string url)" to "async Task" and added "await Task.Delay(1);", so the compiler does not complain:

    var list = new List<Task>();
    list.Add(test("https://www.google.com/"));
    list.Add(test("https://www.bing.com/"));
    Task.WaitAll(list.ToArray());

However neither method worked. The two separate threads/tasks controls the same browser instance, it loads google and bing, in a random order. Please let me know if you need additional information. Thank you.

What is BrowserWorker? I don't see it anywhere in the documentation. — tia
– tia, Commented Dec 30, 2021 at 17:07
@tia my apologies, I have added the function details in the question. — Cal
– Cal, Commented Dec 30, 2021 at 18:12
I never used this, but I would try changing remote debugging port for each instance. — tia
– tia, Commented Dec 31, 2021 at 3:01
@tia thank you! It works! If you would bother making an answer I would be happy to mark it as accepted. — Cal
– Cal, Commented Dec 31, 2021 at 14:39

tia · Accepted Answer · 2021-12-31 14:57:25Z

1

If you launch Chrome with different arguments, it launches a new instance. So in this case making --remote-debugging-port to be in different port will make the driver launch a new instance instead of using the existing instance.

answered Dec 31, 2021 at 14:57

tia

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