public class Startup : IStartup {
        private IContainer _container;
        public Startup(IConfiguration configuration, IContainer container)
        {
            Configuration = configuration;
            _container = container;
       }

        public IConfiguration Configuration { get; }

        public IServiceProvider ConfigureServices(IServiceCollection services)
        {
            // Register additional stuff
            // .....

            // populate the container using the service collection.
            _container.Populate(services);

            return _container.GetInstance<IServiceProvider>();
        }
        public void Configure(IApplicationBuilder app)
        {
             //do additional work 
        }
    }

            var container = new Container();

            var configurationBuilder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json");

            var configuration = configurationBuilder.Build();

            var startup = new Startup(configuration, container);

            var builder = WebHost.CreateDefaultBuilder()
                .UseSetting(WebHostDefaults.ApplicationKey, typeof(Startup).Assembly.GetName().Name)
                .ConfigureServices(services => services.AddSingleton<IStartup>(startup))
                .UseKestrel(options =>
                {
                    options.Listen(IPAddress.Loopback, 1113);
                });

            var host = builder.Build();

            var container = new Container();

            var configurationBuilder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json");

            var configuration = configurationBuilder.Build();

            var startup = new Startup(configuration,  container.CreateChildContainer());

            var builder = WebHost.CreateDefaultBuilder()
                .UseSetting(WebHostDefaults.ApplicationKey, typeof(Startup).Assembly.GetName().Name)
                .ConfigureServices(services => services.AddSingleton<IStartup>(startup))
                .UseKestrel(options =>
                {
                    options.Listen(IPAddress.Loopback, 1113);
                });

            var host = builder.Build();