Adding to the bootstrapper

Since the HeadlinesViewModel depends on the NewsService, we need to register it into our inversion of control (IoC) container. Follow these steps to do so:

1. In the News project, open the Bootstrapper.cs file.
2. Locate the Initialize() method, add the following line marked in bold, and resolve using references:

public static void Initialize()
{
   var containerBuilder = new ContainerBuilder();
   containerBuilder.RegisterType<NewsService>();
   containerBuilder.RegisterType<MainShell>();

   containerBuilder.RegisterAssemblyTypes(typeof(App).Assembly).Where(x => x.IsSubclassOf(typeof(ViewModel)));
   var container = containerBuilder.Build();
   Resolver.Initialize(container);
 } 

This will allow for the dependency injection of the NewsService.