Answer
Transient: new instance each request.
Scoped: one instance per HTTP request.
Singleton: one instance for entire app lifetime. Choosing correct lifetime is crucial to avoid memory leaks and race conditions.
Quick Answer
Transient: new instance every injection — good for stateless services like email senders. Scoped: one instance per HTTP request — DbContext is the canonical example (one per request, shares a transaction). Singleton: one shared instance for the entire app lifetime — good for thread-safe, stateless services like IHttpClientFactory or caches.
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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.
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Source: SugharaIQ