var parameters = new NavigationParameters();
parameters.Add("article", article);
await navigationService.NavigateAsync("ArticleView", parameters);

public void OnNavigatedTo(NavigationParameters parameters)
        {
            Debug.WriteLine("On navigated to fired", "test article view");
            Article = parameters["article"] as Article;
            Debug.WriteLine(article._id, "Article View 1: ");
        }

        public void OnNavigatingTo(NavigationParameters parameters)
        {
            Debug.WriteLine("On navigating to fired", "test article view");
            Article = parameters["article"] as Article;
            Debug.WriteLine(article._id, "Article View 3: ");
        }

        public void OnNavigatedFrom(NavigationParameters parameters)
        {
            Article = parameters["article"] as Article;
            Debug.WriteLine(article._id, "Article View 2: ");
            Debug.WriteLine("On navigated from fired", "test article view");
        }