🎯 Introduction
In .NET Core’s built-in Dependency Injection (DI), services can have different lifetimes: Transient, Scoped, and Singleton.
Understanding these lifetimes is essential for writing efficient and bug-free applications.
👉 Full detailed article:
https://fullstackprep.dev/articles/webd/netcore/service-lifetimes-in-di-dotnet-core
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👶 Fresher Level: Analogy
Imagine you’re at a coffee shop:
Transient → You get a fresh coffee every time you order.
Scoped → You get one coffee cup to refill during your entire visit (one per request).
Singleton → The shop has a giant shared coffee pot that everyone uses.
Each lifetime has its purpose, just like how coffee is served differently depending on the situation.
👨💻 Experienced Level: Technical Breakdown
Transient
New instance every time it’s requested.
Lightweight, stateless services.
Scoped
One instance per HTTP request.
Useful for request-specific data (e.g., user session).
Singleton
Single instance for the entire application lifetime.
Good for configuration, logging, caching.
Example
services.AddTransient();
services.AddScoped();
services.AddSingleton();
👉 More examples explained here:
https://fullstackprep.dev/articles/webd/netcore/service-lifetimes-in-di-dotnet-core
🏗️ Architect Level: Enterprise Perspective
For architects, lifetimes affect:
Memory Management → Singleton reduces allocations but risks memory leaks.
Scalability → Scoped lifetimes ensure request isolation in multi-user apps.
Thread Safety → Singleton services must be thread-safe.
Design Patterns → Choosing the right lifetime aligns with SOLID principles and microservices design.
Bad lifetime choices can lead to performance issues, data leaks, or concurrency bugs.
🚀 Closing Thoughts
Service lifetimes in DI are like how coffee is served in a café:
Fresh every time (Transient),
One cup per visit (Scoped),
Shared pot for everyone (Singleton).
👉 Read the full deep dive here:
https://fullstackprep.dev/articles/webd/netcore/service-lifetimes-in-di-dotnet-core
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