Dependency Injection in Razor Pages?

Short answer: Inject services into PageModel constructor: public IndexModel(IMyService service) { ... } Also available in Razor views via @inject: @inject ILogger<MyPage> Logger

Real-world example (ShopNest)

ShopNest registers AppDbContext as Scoped and IMemoryCache as Singleton. Putting DbContext in a Singleton causes threading bugs.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.