ScreenshotsTests.cs

[Test]
public void TakingHTML2CanvasFullPageScreenshot()
{
    var options = new ChromeOptions();
    options.AddArguments($"load-extension={GetAssemblyDirectory()}\\FullPageScreenshotsExtension-Chrome\\");
    var capabilities = new DesiredCapabilities();
    capabilities.SetCapability(ChromeOptions.Capability, options);
    var dc = DesiredCapabilities.Chrome();
    dc.SetCapability(ChromeOptions.Capability, options);

    using (var driver = new ChromeDriver(options))
    {
        driver.Manage().Timeouts().PageLoad = TimeSpan.FromSeconds(5);
        driver.Navigate().GoToUrl(@"https://automatetheplanet.com");
        var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
        var fullPageImg = wait.Until(ExpectedConditions.ElementExists(By.Id("fullPageScreenshotId")));
        var pngContent = fullPageImg.GetAttribute("src");
        pngContent = pngContent.Replace("data:image/png;base64,", string.Empty);
        byte[] data = Convert.FromBase64String(pngContent);
        var tempFilePath = Path.GetTempFileName().Replace(".tmp", ".png");
        Image image;
        using (var ms = new MemoryStream(data))
        {
            image = Image.FromStream(ms);
        }
        image.Save(tempFilePath, ImageFormat.Png);
    }
}
        
private string GetAssemblyDirectory()
{
    string codeBase = Assembly.GetExecutingAssembly().CodeBase;
    var uri = new UriBuilder(codeBase);
    string path = Uri.UnescapeDataString(uri.Path);
    return Path.GetDirectoryName(path);
}