Decision Guide
The built-in Microsoft container is sufficient for many services, especially with explicit composition. Third-party containers become valuable when advanced scopes, module registration patterns, or cross-cutting wiring policies are central requirements.
The decision to make
Should a .NET application stay with built-in DI or adopt a third-party container extension?
Curated starting points to compare. Always evaluate suitability against your specific project requirements.
Built-in DI container abstractions and implementation used by the default .NET hosting model.
Autofac integration with .NET hosting, enabling richer container capabilities and registration patterns.
Extends Microsoft DI with assembly scanning and decorator registration helpers.
Keep registrations in a small, explicit composition root grouped by feature or infrastructure boundary. Use constructor injection and make lifetimes part of each service's design contract.
Validate the service provider at startup in development and test that each feature module can be composed. Prefer explicit factory abstractions over a service locator for runtime choices.
Add scanning or decorators only after documenting selection rules and collision behavior. Review registration graphs when adding hosted services, caches, or background workers.
Risk
Checklist
Re-evaluate DI package strategy when composition complexity increases, startup regressions appear, or architecture standards shift toward stricter module boundaries.