C# Skill Architecture
1. Skill Context
Focus: Enterprise backend systems, game development (Unity), high-performance cloud APIs (.NET Core).
Triggers: csharp, c#, .net core, linq, async await, entity framework, asp.net.
2. Core Principles
- Managed Memory with Value Types: C# uses a Garbage Collector for classes (reference types allocated on the Heap), but heavily utilizes
struct (value types allocated on the Stack) to achieve C++ like memory locality and avoid GC pressure.
- Asynchronous by Default: The
async / await state machine is baked into the language deeply, making I/O bound scalability trivial compared to classic thread pools.
- Language Integrated Query (LINQ): Functional programming concepts applied to collections, SQL databases, and XML.
3. Anti-Patterns
async void: Should only ever be used for UI Event Handlers. Using async void in a library or API swallows exceptions and crashes the application domain. Always use async Task..Result or .Wait(): Blocking an async task synchronously causes catastrophic thread pool starvation (Deadlocks) in ASP.NET classic. Always use await.- String Concatenation in Loops: Strings are immutable. Using
+= in a loop allocates thousands of strings. Use StringBuilder.
4. References
references/csharp-fundamentals.md — Value vs Reference types, LINQ, Async.references/csharp-advanced.md — Reflection, Span, Source Generators.references/csharp-testing.md — xUnit, Moq, FluentAssertions.
1---2name: csharp3description: C# Skill Architecture4---5# C# Skill Architecture67## 1. Skill Context8**Focus**: Enterprise backend systems, game development (Unity), high-performance cloud APIs (.NET Core).9**Triggers**: csharp, c#, .net core, linq, async await, entity framework, asp.net.1011## 2. Core Principles12- **Managed Memory with Value Types**: C# uses a Garbage Collector for classes (reference types allocated on the Heap), but heavily utilizes `struct` (value types allocated on the Stack) to achieve C++ like memory locality and avoid GC pressure.13- **Asynchronous by Default**: The `async / await` state machine is baked into the language deeply, making I/O bound scalability trivial compared to classic thread pools.14- **Language Integrated Query (LINQ)**: Functional programming concepts applied to collections, SQL databases, and XML.1516## 3. Anti-Patterns17- **`async void`**: Should only ever be used for UI Event Handlers. Using `async void` in a library or API swallows exceptions and crashes the application domain. Always use `async Task`.18- **`.Result` or `.Wait()`**: Blocking an async task synchronously causes catastrophic thread pool starvation (Deadlocks) in ASP.NET classic. Always use `await`.19- **String Concatenation in Loops**: Strings are immutable. Using `+=` in a loop allocates thousands of strings. Use `StringBuilder`.2021## 4. References22- `references/csharp-fundamentals.md` — Value vs Reference types, LINQ, Async.23- `references/csharp-advanced.md` — Reflection, Span, Source Generators.24- `references/csharp-testing.md` — xUnit, Moq, FluentAssertions.
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