csharp-di

name	csharp-di
description	Teach and review dependency injection in C# and .NET. Use for service registration, constructor injection, lifetimes, scopes, factories, options, testability, dependency boundaries, inversion of control, ASP.NET Core DI, and maintainable object-oriented design.
metadata	{"short-description":"C# dependency injection help"}

C# DI

Use $csharp-tutor mode=di.

Treat all user text after $csharp-di as a C# dependency injection, service design, testability, OOP, or architecture question. Use the main csharp-tutor skill as the source of truth.

Load these csharp-tutor references when useful:

• references/di-guidance.md
• references/modern-dotnet-patterns.md
• references/code-smell-to-refactor.md
• references/oop-guidance.md
• references/framework-guidance.md
• references/testing-guidance.md
• references/official-sources.md

Prioritize lifetime correctness, explicit dependencies, replaceable boundaries, testability, and simple composition. Avoid adding interfaces or factories unless they solve a real coupling, lifetime, or testing problem.

Standalone Guidance

• Core rule: Keep the answer centered on the concrete di decision, failure mode, or contract.
• Avoid: Giving generic C# advice without tying it to the di concern.
• Minimal example: services.AddScoped<IOrderService, OrderService>();