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Primitive obsession—using int or string for entity IDs—allows IDs to be passed interchangeably, causing logic errors that only surface at runtime. Strongly-typed IDs solve this by wrapping primitives in readonly record structs, giving each entity its own ID type. EF Core supports this through ValueConverter, which stores the underlying int while enforcing type safety at compile time. This approach catches ID mismatches early, improves method signature clarity, and encapsulates domain meaning without manual validation.

Implementing strongly-typed IDs in .NET for safer domain models

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