C# CRUD API: 13 Real Anti-Patterns Explained and Fixed Side by Side

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A developer tutorial on DEV Community walks through a realistic Product CRUD API built deliberately using thirteen anti-patterns commonly found in actual codebases. The guide covers five endpoints — GetAll, GetById, Create, Update, and Delete — showing the flawed implementation alongside a corrected version for direct comparison. Key issues highlighted include hardcoded database credentials committed to source code and incorrect service lifetimes, such as registering a controller as a Singleton rather than letting the framework handle per-request instantiation. The tutorial also explains the 'captive dependency' problem, where a Scoped service like DbContext gets unintentionally trapped inside a Singleton, causing thread-safety violations. Each anti-pattern is explained in context, aiming to help developers recognize subtle but consequential mistakes in real-world code.

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