Asp.net Core 3.1 resolve Autofac container in startup and do some initialisation

Question

net core 2.2 to 3.1 recently and having an issue with Autofact. I will need to do some initialisation after container is built.

In Asp.net Core 2.2, I have the following code in Startup.cs

        public IServiceProvider ConfigureServices(IServiceCollection services)
    {
        // do some other registr

        builder.Populate(services);

        IContainer container = builder.Build();

        // Do some initialisation
        container.Resolve<IMessageQueueService>().RegisterBodiesListener();

        return new AutofacServiceProvider(container);
    }

In the above code, IMessageQueueService is inherited from another interface IService and injected to container with

builder.RegisterAssemblyTypes(GetType().Assembly)
            .As(typeof(IService))
            .AsImplementedInterfaces();

However, in Asp.net Core 3.1 since the Build() will be handled by Autofac itself, where I can do the initialisation?

Thank you

Answer 1

I got it. There is a callback we can use when Autofac builds

builder.RegisterBuildCallback(c => {
            c.Resolve<IMessageQueueService>();
            });

Refer to This Autofac Document