Modern Csharp Coding Standards

Modern C# Coding Standards

When to Use This Skill

Use this skill when:

• Writing new C# code or refactoring existing code
• Designing public APIs for libraries or services
• Optimizing performance-critical code paths
• Implementing domain models with strong typing
• Building async/await-heavy applications
• Working with binary data, buffers, or high-throughput scenarios

Core Principles

1. Immutability by Default - Use record types and init-only properties
2. Type Safety - Leverage nullable reference types and value objects
3. Modern Pattern Matching - Use switch expressions and patterns extensively
4. Async Everywhere - Prefer async APIs with proper cancellation support
5. Zero-Allocation Patterns - Use Span<T> and Memory<T> for performance-critical code
6. API Design - Accept abstractions, return appropriately specific types
7. Composition Over Inheritance - Avoid abstract base classes, prefer composition
8. Value Objects as Structs - Use readonly record struct for value objects

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Naming Conventions

General Rules