ConfigureServices.cs

Startup.cs

public void ConfigureServices(IServiceCollection services)
{ 
  // Define a writer that saves my data to disk
  var folderPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
                                "rower");

  services.AddSingleton<ISampleWriter>(svc => new SampleWriter(folderPath, "samples"));

  // Keep my machine state as a singleton
  services.AddSingleton<IMachineState, MachineState>();

  services.AddControllersWithViews()
      .AddNewtonsoftJson();
  services.AddRazorPages();

  // Add signalr services
  services.AddSignalR();
}