使用通用IHostBuilder时访问IServiceProvider

IHostBuilder 在.NET Core 2.1控制台应用程序中。Main看起来像这样:

    public static async Task Main(string[] args)
    {
        var hostBuilder = new HostBuilder()
            .UseServiceProviderFactory(new AutofacServiceProviderFactory())
            .ConfigureServices(services =>
            {
                // Register dependencies
                // ...

                // Add the hosted service containing the application flow
                services.AddHostedService<RoomService>();
            });

        await hostBuilder.RunConsoleAsync();
    }
}

IWebHostBuilder ,我有 Configure() 让我这样做的方法:

public void Configure(IApplicationBuilder applicationBuilder, IHostingEnvironment environment)
{
    // Resolve something unrelated to the primary dependency graph
    var thingy = applicationBuilder.ApplicationServices.GetRequiredService<Thingy>();
    // Register it with the ambient context
    applicationBuilder.AddAmbientThingy(options => options.AddSubscriber(thingy));

    // Use MVC or whatever
    // ...
}

这允许我注册一些环境(使用环境上下文模式),而不是应用程序主依赖关系图的一部分(如您所见,我仍然使用容器来实例化它,这当然比手动更新它更可取。我们可以将其视为次要的环境依赖关系图。)

IServiceProvider 或者 IApplicationBuilder . 在这种情况下,我如何实现相同的注册?