neo-csharp

# Modern C# (10+) Expert Skill ## Trigger On - The user asks to write, debug, refactor, or review C# code. - The project directory contains `*.cs`, `*.csproj`, or single-file C# scripts. - The target framework is .NET 6.0 (LTS) and above. - Code modernization is needed (e.g., converting legacy nested namespaces to File-scoped namespaces). ## Workflow 1. **Perceive (Version Awareness):** - Check `.csproj` to identify `TargetFramework` and determine the syntax upper limit: - `net6.0`: C# 10 (File-scoped namespaces, Global usings). - `net7.0`: C# 11 (Raw string literals, Required members). - `net8.0`: C# 12 (Primary Constructors, Collection Expressions). - `net9.0`: C# 13 (`params` collections, `Lock` object). - `net10.0`: C# 14 (Extension members, `field` keyword). 2. **Reason (Planning Phase):** - Evaluate the modernization level of the current code to determine the refactoring strategy. - In lower version environments (like .NET 6), avoid using higher version syntax (like Primary Constructors), but prioritize using File-scoped namespaces. - In higher version environments, actively adopt new features to reduce boilerplate code. 3. **Act (Execution Phase):** - Write high-quality code, prioritizing "syntactic sugar" to improve readability. - Implement strong typing and immutable data structures (`record`, `record struct`). - Utilize **Interpolated string handlers** and **Span<T>** to optimize performance-sensitive paths. 4. **Valid...