12 Rules for Dependency Injection in ASP.NET Core
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A practical guide covering 12 rules for using dependency injection effectively in ASP.NET Core. Topics include choosing the right service lifetime (Transient, Scoped, Singleton), injecting interfaces over concrete types, avoiding lifetime mismatches like injecting transient services into singletons, using IServiceScopeFactory for background services, organizing registrations with extension methods, enabling startup validation, avoiding the service locator pattern, preventing circular dependencies, and using IOptions for strongly typed configuration.
Table of contents
1. Use Transient for Stateless and Short-Lived Services2. Use Scoped for Per-Request Services3. Use Singleton for Shared Application-Wide Services4. Inject Interfaces Instead of Concrete Implementations5. Keep Dependencies Minimal6. Avoid Injecting Transient Services into Singletons7. Use IServiceScopeFactory When a Singleton Needs a Scoped Service8. Organize Registrations Using Extension Methods9. Validate Dependency Injection During Startup10. Avoid GetService() and the Service Locator Pattern11. Prevent Circular Dependencies12. Use IOptions for Configuration SettingsFinal ThoughtsBonus253 Impressions1 Comment