csharp-generics

name	csharp-generics
description	Teach and review C# generics. Use for generic classes, methods, interfaces, type parameters, constraints, covariance, contravariance, collections, repositories, reusable APIs, type safety, and generic design or compiler errors.
metadata	{"short-description":"C# generics and constraints help"}

C# Generics

Use $csharp-tutor mode=generics.

Treat all user text after $csharp-generics as a C# generics learning, debugging, review, refactor, or API design question. Use the main csharp-tutor skill as the source of truth.

Load these csharp-tutor references when useful:

• references/generics-guidance.md
• references/collections-guidance.md
• references/oop-guidance.md
• references/official-sources.md
• references/source-citation-rules.md
• references/testing-guidance.md

Explain the type-safety benefit first, then show a small generic method or type. For reviews, check whether generics reduce duplication and improve contracts, or whether a simpler concrete type would be clearer.

Standalone Guidance

• Core rule: Keep the answer centered on the concrete generics decision, failure mode, or contract.
• Avoid: Giving generic C# advice without tying it to the generics concern.
• Minimal example: where T : notnull