C# LINQ for Database Queries: Comparison with Doctrine DQL and Entity Framework Core

LINQ (Language Integrated Query) is one of C#'s most distinctive features: type-safe queries over collections, XML, APIs, and databases using unified syntax with compile-time verification and IDE autocompletion.

Combined with Entity Framework Core (EF Core), LINQ translates directly to SQL. The mapping to Doctrine concepts is direct: DbContext = EntityManager, DbSet<T> = Repository, Include() = Doctrine JOIN FETCH, Skip()/Take() = setFirstResult()/setMaxResults().

Key advantages over Doctrine DQL: Everything is type-safe and checked at compile time. Navigation property names in Include() are verified by the compiler. Projection types (Select(p => new ProductDto(...))) ensure only needed fields are loaded. The N+1 problem is solved with Include() for eager loading, just like Doctrine's JOIN FETCH.

Raw SQL is available when LINQ can't express the query, via FromSqlRaw() and EF Core 8's SqlQuery<T>() for non-entity results.