What you'll learn

Scattered validation and filtering logic across your codebase creates serious maintenance challenges where changing a business requirement means tracking down every implementation instance through dozens of files — hoping you find every duplicate piece of code. In this course, Domain-driven Design: Specification Pattern, you'll learn to eliminate code duplication and create maintainable, composable domain logic using the Specification pattern with C# and Entity Framework Core. First, you'll explore how to identify code duplication problems and understand the three core use cases where the Specification pattern provides value. Next, you'll discover how to implement strongly-typed specifications and integrate them seamlessly with Entity Framework Core to generate efficient database queries while maintaining clean separation of concerns. Finally, you'll learn how to compose complex business logic using logical operators and apply best practices for Specification design, including when not to use the pattern. When you're finished with this course, you'll have the skills and knowledge of the Specification pattern needed to transform scattered business logic into maintainable, testable, and composable domain specifications.