Answer
Transient: New instance each request.
Scoped: One instance per HTTP request.
Singleton: One instance for entire app lifetime.
Wrong lifetimes cause concurrency bugs, memory leaks, or stale state.
Quick Answer
Transient: fresh instance each injection — good for lightweight, stateless services. Scoped: single instance per HTTP request — EF Core DbContext is the classic example. Singleton: one shared instance for the app's lifetime — should be thread-safe. Never capture Scoped or Transient services in a Singleton — they'll be shared across all requests incorrectly.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ