.NET Core Dependency Injection – The Booster Jab
summary
Covers concrete pitfalls and workarounds for the built‑in Microsoft DI: singleton constructors can capture scoped or transient instances and leak them for app lifetime; middleware singletons resolve scoped services from the root provider; use UseServiceProviderFactory to plug in Autofac and ConfigureContainer for its modules; emulate named/key resolution with a string→implementation delegate (example: temperature converters) and use custom delegates for testable DateTime. Shows factory/builder patterns, Scrutor assembly scanning, IHostApplicationLifetime for disposing hand‑created instances, and a hosted warm‑up service to improve startup JIT and singleton readiness.
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chapters (19)
- 0:00Introduction
- 7:02Lifetimes
- 14:13Scope
- 25:00registration
- 27:44hints and tricks
- 34:18design patterns
- 41:18runtime error
- 41:50value types
- 42:13record types
- 42:57custom delegates
- 46:07delegate example
- 46:50antipattern
- 47:49example
- 48:12delegate
- 49:03consumer
- 49:35decorator
- 51:19registration services
- 52:18performance
- 53:19wrap up
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