Topshelf - tworzenie usługi systemowej

Downloader.cs

public class Downloader : IDownloader
{
    public void Download(string url)
    {
        var client = new WebClient();

        var content = client.DownloadString(url);
    }
}

public interface IDownloader
{
    void Download(string url);
}

DownloadViewModel.cs

public class DownloadViewModel
{
    [Required]
    public string Url { get; set; }
}

HangfireService.cs

public class HangfireService
{
    private BackgroundJobServer _server;

    static HangfireService()
    {
        GlobalConfiguration.Configuration
            .UseSqlServerStorage(@"Server=localhost\sqlexpress;Database=TopshelfExample;Trusted_Connection=True;");
    }

    public void Start()
    {
        var options = new BackgroundJobServerOptions();

        _server = new BackgroundJobServer(options);
    }

    public void Stop()
    {
        if(_server != null)
        {
            _server.Dispose();
        }            
    }
}

HomeController.cs

public class HomeController : Controller
{
    private Downloader _downloader = new Downloader();

    public ActionResult Index()
    {
        return View();
    }

    public ActionResult Download()
    {
        return View(new DownloadViewModel());
    }

    [HttpPost]
    public ActionResult Download(DownloadViewModel viewModel)
    {
        if(ModelState.IsValid == false)
        {
            return View(viewModel);
        }

        BackgroundJob.Enqueue(() => _downloader.Download(viewModel.Url));

        return RedirectToAction("Download");
    }
}

Program.cs

class Program
{
    static void Main(string[] args)
    {
        HostFactory.Run(x =>
        {
            x.UseNLog();

            x.Service<HangfireService>(h =>
            {
                h.ConstructUsing(n => new HangfireService());
                h.WhenStarted(s => s.Start());
                h.WhenStopped(s => s.Stop());
            });

            x.RunAsLocalSystem();

            x.SetDescription("Hangfire Service");
            x.SetDisplayName("Hangfire Service");
            x.SetServiceName("Hangfire Service");
        });
    }
}