Finalizing the ItemSelected command

We previously defined the ItemSelected command in the HeadlinesViewModel class. It's now time to add code that will perform the navigation to the ArticleView by following these two steps:

1. In the News project, expand the ViewModels folder and open HeadlinesViewModel.cs. 
2. Locate the ItemSelected property and add the following line marked in bold:

public ICommand ItemSelected =>
    new Command(async (selectedItem) =>
    {
        var selectedArticle = selectedItem as Article;
        var url = HttpUtility.UrlEncode(selectedArticle.Url);
        await Navigation.NavigateTo($"articleview?url={url}");
    });

We will define a route called articleview that takes a query-line parameter called url that points the URL of the article itself, and it will look something like this: articleview?url=www.mypage.com. Only the data passed after the url= argument must be UrlEncoded, meaning...