code-standards-csharp

name	code-standards-csharp
description	C# 14 coding standards. Invoke this skill always when working in C# language.

• Use extension blocks for multiple related extension members; keep this methods for single helpers
• Prefer field backed properties for simple validation; explicit backing fields for complex logic
• Use null-conditional assignment ?. and ?[] over manual null checks
• Use unbound generic nameof for type references in logging/exceptions
• Use Span<T>/ReadOnlySpan<T> params and overloads for hot paths; IEnumerable<T> for streams
• Apply lambda modifiers (ref, in, scoped, ref readonly) only when the contract demands it
• Reserve partial constructors/events for source generators; avoid in hand-written domain code
• Implement compound assignment operators (+=, -=) only when semantics are intuitive
• Prefer required init-only properties over complex constructors for mandatory data
• Use readonly fields and records for immutable data; seal classes by default
• Avoid async void; always return Task or ValueTask
• Use is pattern matching over as + null check
• Prefer ArgumentNullException.ThrowIfNull over manual validation
• Keep LINQ method syntax; query syntax only for simple joins
• Enable nullable reference types and treat warnings as errors