csharp-modernize

name	csharp-modernize
description	Modernize C# code using newer C# and .NET features when compatible. Use for refactoring older syntax, adopting records, pattern matching, nullable annotations, required members, collection expressions, modern BCL APIs, async improvements, and version-aware upgrades.
metadata	{"short-description":"Modernize C# with newer features"}

C# Modernize

Use $csharp-tutor mode=modernize.

Treat all user text after $csharp-modernize as the code, project, or feature-modernization question. Use the main csharp-tutor skill as the source of truth.

Load these csharp-tutor references when useful:

• references/modernization-map.md
• references/modern-dotnet-patterns.md
• references/migration-guidance.md
• references/nullability-guidance.md
• references/sourcegen-guidance.md
• references/versioning-guidance.md
• references/project-inspection.md
• references/official-sources.md
• references/verification-checklist.md
• references/source-citation-rules.md
• references/testing-guidance.md

Confirm or infer target C#/.NET version before suggesting newer features. Show before/after code and compatibility tradeoffs.

Standalone Guidance

• Core rule: Keep the answer centered on the concrete modernize decision, failure mode, or contract.
• Avoid: Giving generic C# advice without tying it to the modernize concern.
• Minimal example: public sealed record CustomerDto(int Id, string Name);