public static IHostBuilder CreateHostBuilder(string[] args) =>

            Host.CreateDefaultBuilder(args)

                .ConfigureWebHostDefaults(webBuilder =>

                {

                    webBuilder.UseStartup<Startup>();

                })

            .UseServiceProviderFactory(new AutofacServiceProviderFactory());

 public void ConfigureContainer(ContainerBuilder builder)

        {

            #region 注入业务服务（此处使用反射注入）

            Assembly assembly = Assembly.Load("Qingy.DotNetCoreStudy.CustomerServiceService");

            List<Type> types = assembly.GetTypes().Where(u => u.IsClass && !u.IsAbstract && !u.IsGenericType

            && u.GetInterfaces().Any(p => p == typeof(ICustomerServicerSerice))

            ).ToList();

            builder.RegisterTypes(types.ToArray()).InstancePerLifetimeScope();  //注入，并声明生命周期

            #endregion 

        }