如何从HostBuilder获取AutoFac的IComponentContext

//autofac
componentContext.ResolveKeyed<ISampleService>("debug");

//not available in .NET HostBuilder even if I used autofac as container
host.Services.GetService<ISampleService>();

我尝试获取IComponentContext,但它返回null

host.Services.GetService<IComponentContext>();

这就是我注册服务的方式。

 var builder = new HostBuilder()
   .UseServiceProviderFactory(new AutofacServiceProviderFactory())
   .ConfigureContainer<ContainerBuilder>((context, builder) =>
   {
      builder.RegisterType<FakeDatabase>().Named<IDatabase>("debug");
      builder.RegisterType<HostedService>().Named<IHostedService>("debug");
      builder.RegisterType<ActualDatabase>().As<IDatabase>();
      builder.RegisterType<HostedService>().As<IHostedService>();
   });