C# › Dependency Injection & IoC Principles
How would you write a custom IServiceProviderFactory or use a third-party container (like Autofac) to enable advanced DI features not supported by the built-in ASP.NET Core container, like property injection or convention-based registration?
AdvancedAnswer
Implement IServiceProviderFactory<TContainerBuilder> to swap the built-in container for a third-party one, then use ConfigureContainer() in the host builder to register services using that container's richer API — this lets you keep using standard ASP.NET Core hosting/middleware while gaining advanced DI capabilities the built-in container intentionally omits for simplicity.
var builder = WebApplication.CreateBuilder(args);
builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory());
builder.Host.ConfigureContainer<ContainerBuilder>(containerBuilder => {
containerBuilder.RegisterAssemblyTypes(typeof(Program).Assembly)
.Where(t => t.Name.EndsWith("Service"))
.AsImplementedInterfaces(); // convention-based registration, not built into the default container
});Real-world example Adopting Autofac in an ASP.NET Core project specifically to get convention-based auto-registration or property injection support.