Tim Deschryver • 10/10/2024

Create a custom SQL expression with Entity Framework, or how to make EF interpret your Value Types

This technical article addresses a specific Entity Framework Core problem: querying data using lookup methods (like .Contains) on custom Value Type properties, such as strongly-typed IDs generated via the StronglyTypedId NuGet package. It details why such queries fail by default and provides a solution by implementing and configuring a DbFunction to translate the C# logic into a valid SQL expression.

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#Entity Framework #Value Types #SQL Expressions