C#

--- name: C# slug: csharp version: 1.0.1 description: Write robust C# avoiding null traps, async deadlocks, and LINQ pitfalls. metadata: {"clawdbot":{"emoji":"💜","requires":{"bins":["dotnet"]},"os":["linux","darwin","win32"]}} --- ## Quick Reference | Topic | File | |-------|------| | Null reference, nullable types | `nulls.md` | | Async/await, deadlocks | `async.md` | | Deferred execution, closures | `linq.md` | | Value vs reference, boxing | `types.md` | | Iteration, equality | `collections.md` | | IDisposable, using, finalizers | `dispose.md` | ## Critical Rules - `?.` and `??` prevent NRE but `!` overrides warnings — still crashes if null - `.Result` or `.Wait()` on UI thread — deadlock, use `await` or `ConfigureAwait(false)` - LINQ is lazy — `query.Where(...)` doesn't execute until iteration - Multiple enumeration of IEnumerable — may re-query database, call `.ToList()` first - Closure captures variable, not value — loop variable in lambda captures last value - Struct in async method — copied, modifications lost after await - String comparison culture — `StringComparison.Ordinal` for code, `CurrentCulture` for UI - `GetHashCode()` must be stable — mutable fields break dictionary lookup - Modifying collection while iterating — throws, use `.ToList()` to iterate copy - `decimal` for money — `float`/`double` have precision loss - `readonly struct` prevents defensive copies — use for performance - `sealed` prevents inheritance — enables devirtualization optimization

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