ArticlePageController.cs

public class ArticlePageController : PageController<ArticlePage>
{
    private readonly PreviewPageHelper _pageHelper;

    public ArticlePageController(PreviewPageHelper pageHelper)
    {
        _pageHelper = pageHelper;
    }

    public IActionResult Index(ArticlePage currentPage)
    {
        var page = _pageHelper.GetPage<ArticlePage>(currentPage.ContentLink);
        return View(page);
    }
}