Six thread-safe .NET patterns from

Short summary

Thread-safe .NET code prioritizes immutability first, then encapsulation behind actors or queues, then minimal synchronization with locks/SemaphoreSlim. The post covers six patterns with working code: readonly records, ConcurrentDictionary, lock statements, SemaphoreSlim for async, actor-model via Channels, and stress-testing guidance. Key rule: make data read-only, keep critical sections tiny, use async-aware primitives (never .Result/.Wait() in ASP.NET).

• •Six thread-safety patterns ranked: immutability, encapsulation, locks, semaphores, actors, external queues
• •Working .NET code examples for each pattern (records, ConcurrentDictionary, Channels)
• •Best practices: avoid lock(this), keep critical sections short, never block async calls

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