specification-pattern

You can encapsulate reusable query criteria by creating a concrete specification that extends BaseSpecification<T>, configuring Criteria and Includes, and passing it to a repository for execution in EF Core.

The specification pattern in C# encapsulates query logic into reusable, composable criteria that can be combined and tested in isolation, enabling clean data access when you have advanced filtering, includes, ordering, and paging requirements.

You can combine multiple query filters by composing criteria with And/Or operations to form complex filters, allowing type-safe, testable query logic that integrates with the SpecificationEvaluator in your .NET applications.

Yes, the specification pattern supports paging and ordering by applying includes, ordering, and paging criteria through the SpecificationEvaluator, which integrates with LINQ and EF Core for domain queries.

You can unit test query logic separately by encapsulating it into composable criteria that are type-safe and testable in isolation, ensuring compile-time checks while validating query logic without hitting the database.

The best way to handle advanced domain queries across multiple repositories is to define a base query once using a specification and reuse those composable criteria, ensuring clean data access and consistent filtering across your .NET application.