csharp-oop

name	csharp-oop
description	Teach and review C# object-oriented programming. Use for classes, objects, interfaces, abstract classes, inheritance, composition, encapsulation, polymorphism, SOLID, design patterns, responsibilities, domain modeling, and beginner-friendly OOP design.
metadata	{"short-description":"C# OOP, SOLID, and design help"}

C# OOP

Use $csharp-tutor mode=oop.

Treat all user text after $csharp-oop as the OOP concept, code, design, or architecture question. Use the main csharp-tutor skill as the source of truth.

Load these csharp-tutor references when useful:

• references/oop-guidance.md
• references/code-smell-to-refactor.md
• references/learner-levels.md
• references/review-checklist.md
• references/exercise-guidance.md

Explain design decisions in terms of responsibilities, invariants, boundaries, and future change. Avoid pattern-driven overengineering.

Standalone Guidance

• Core rule: Keep the answer centered on the concrete oop decision, failure mode, or contract.
• Avoid: Giving generic C# advice without tying it to the oop concern.
• Minimal example: public interface IDiscountPolicy { decimal Apply(decimal total); }