Using Options pattern (IOptions<T>, IOptionsSnapshot<T>,?

Short answer: IOptionsMonitor<T>) IOptions<T>: Reads settings once at startup. IOptionsSnapshot<T>: Gets updated settings per request (for scoped services). IOptionsMonitor<T>: Supports change notifications and works in singleton services. public MyService(IOptions<MySettings> options) {

Example code

var settings = options.Value;
}

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.