Architecting Smarter Apps with Entity Framework
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This document discusses how to architect smarter applications using Entity Framework. It recommends using POCOs to separate domain classes from data access for testability and reusability. It also suggests implementing IObjectSet/IDbSet interfaces to build agnostic repositories. This allows preserving testability while still using Entity Framework functionality like change tracking through interfaces. The document concludes that while EF defaults allow quick development, it can also support reusable architectures with testable classes and repositories when using POCOs and interfaces.
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Architecting Smarter Apps with Entity Framework
- 1. Architecting Smarter Apps with Entity Framework Julie Lerman 4/19/2011
- 2. Julie Lerman consultant/mentor Microsoft MVP, INETA Speaker, ASPInsider, MCP, VTdotNET Leader contact jlerman@theDataFarm.com www.thedatafarm.com blog theDataFarm.com/blog twitter @julielerman book web site LearnEntityFramework.com
- 3. EF4 Tools for Persistence Ignorance 3
- 4. Persistence Ignorance via POCOs Code First Database First & Model First 4
- 5. POCO Change Tracking “Snapshot” 4.0, 4.1 Person Object ObjectContext State info Order Object State info Detail Object State info Detail Object State info Order Object State info Detail Object State info Detail Object State info
- 6. POCO Notes 6
- 7. IObjectSet/IDbSet for Separation • Set with Collection-like behavior – Add, Attach, Delete, etc. • ObjectSet/DbSet – Concrete class – Implements IObjectSet/IDbSet – Inherits ObjectQuery • Extensions to recreate EF specific methods – Include
- 8. PI/Repositories Classes System.Data.Entity Fake ObjectSet Fake Context & Data A EDM & Fake Context & Data B ObjectContext Class Class Repositories Class Repositories Class Repositories Repositories UI Tests Unit of Work
- 9. Summary • EF Defaults are great for quick drag & drop apps • EF can be used in testable, reusable architecture • Use POCOs to separate domain classes from data access • IObjectSet/IDbSet for building for agnostic repositories • Consider loss of framework specific features e.g., Include 9
- 10. Resources • Book blog: learnentityframework.com • MSDN EF Dev Center: msdn.com/data/ef • EF Team Blog: blogs.msdn.com/adonet • Agile Entity Framework 4 Repository Blog Series – http://bit.ly/2VaFrr • Testability and Entity Framework 4.0, Scott Allen, http://msdn.microsoft.com/en-us/ff714955.aspx 10