Using IServiceProvider / IServiceScopeFactory?

Short answer: IServiceProvider: Resolves services manually. IServiceScopeFactory: Creates a new DI scope (useful for background tasks). using (var scope = serviceScopeFactory.CreateScope())

Example code

{
var scopedService = scope.ServiceProvider.GetRequiredService<IMyScopedService>(); }

Real-world example (ShopNest)

A ShopNest checkout request flows through middleware, hits a minimal API or controller, uses scoped services, and returns ProblemDetails on errors.

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.