2. Daniel Simmons Dev Manager Microsoft Session Code: DTL401

3. Agenda Goals Priority 1: Increase success with the EF now Priority 2: Prepare for what is coming in EF4 Approach: Create an EF N-Tier Web Application Sketch architecture Build EF data access layer and business objects Customize code generation to add OnValidate Create fake repository and web application Add WCF service and real repository

4. Target Architecture DB & Service Tier Data Access Layer Business Objects WCF Service Web Server WCF Client Business Objects Web UI Browser

5. Architectural Considerations Know what tiers are needed and why Tier may have multiple layers Sample mid-tier has DAL, business objects and service Sample web-tier has repository, business objects and UI Sample separates web-tier from mid-tier because… Reduces internal network surface exposed to the DMZ Creates option for web-tier scale out Consider service operations and payload shapes Factors include change rates and trust boundaries Sample uses custom services and shared entities

6. Mid-Tier Persistence Entity Partial Classes Entity Framework Context Entities DAL Business Objects Generated Hand-Written

7. Demo #1: DAL and Business Objects Look at an EF Model based on Northwind Examine modifications for concurrency checks Debug optimistic concurrency in action

8. DAL and Business Objects

9. Demo 1 Takeaways EF enables separate DAL and business object layers, but there is much less code to write Hand-written DAL is replaced by combination of: EF storage/entity mapping generated context Business objects also generated, but extended with custom business logic Pay attention to concurrency Especially in disconnected scenarios

10. T4 Output Text Control Code Template Metadata Generated Code T4

11. Demo #2: T4 and OnValidate Add T4 template to customize generated code Modify template for OnValidate mechanism Add partial class with validation code Test validation

12. T4 and OnValidate

13. Demo 2 Takeaways T4 makes customizing code generation easy EF4 will use T4 in a big way Register SavingChanges event handler during context construction EF4 makes SaveChanges virtual ObjectStateManager tracks all changes Use LINQ to Objects to interrogate it Avoid modifying other entities in OnValidate

14. Web Tier & Repository Pattern Repository Fake Impl Real Impl Web UI Business Objects

15. Demo #3: Fake Repository & Web UI Add ICustomerRepository interface Create fake implementation Pull in Web UI written using the repository

16. Fake Repository & Web UI

17. Demo 3 Takeaways Mental model of a repository is an in-memory collection Centralizes all data access in one place Easy to understand and tune if needed De-couples rest of application from data access Easily create fake or mock implementations Enables multiple real implementations Did I mention that it de-couples the rest of your application from data access?

18. Cross-tier Communication Persistence WCF Service Web-tier WCF Client Repository Mid-tier Serialized Entities

19. Demo #4: Connecting the Dots Turn ICustomerRepository into service contract Extend context class with AttachAsModified Add implementation of service contract Examine EF disconnected updates Test the implementation Examine web tier auto-proxy repository Run the final application

20. Connecting the Dots

21. Demo 4 Takeaways Concurrency for disconnected operations Maintain concurrency value from first read Change-tracking for disconnected operations Individual property tracking often unnecessary Disconnected graph manipulation Mixed operations quite difficult in 3.5 sp1 State transitions also constrained in 3.5 sp1 Context operations treat graph uniformly Improvements here in EF4 (APIs, Self-Tracking)

22. What Next? Same patterns apply to.net 3.5 sp1 rich clients EF4 POCO support adds many options Completely separate business objects from DAL Serialize business objects to Silverlight,.Net 2.0, … Additional flexibility in business logic and testability Model-first enables generating DB Code-only removes need for separate metadata and mapping info

24. More Resources Code EF: http://msdn.microsoft.com/en-us/data/aa937723.aspx http://msdn.microsoft.com/en-us/data/aa937723.aspx EF FAQ: http://blogs.msdn.com/dsimmons/pages/entity-framework-faq.aspx http://blogs.msdn.com/dsimmons/pages/entity-framework-faq.aspx ASP.Net MVC: http://www.asp.net/mvc http://www.asp.net/mvc Docs Sample: http://code.msdn.microsoft.com/dtl401sample http://code.msdn.microsoft.com/dtl401sample T4 Templates: http://code.msdn.microsoft.com/t4ef35sp1 http://code.msdn.microsoft.com/t4ef35sp1 Blogs Mine: http://blogs.msdn.com/dsimmons http://blogs.msdn.com/dsimmons EF Design: http://blogs.msdn.com/efdesign http://blogs.msdn.com/efdesign ADO.Net Team: http://blogs.msdn.com/adonet http://blogs.msdn.com/adonet

25. Related Content Breakout Sessions DAT308 Design Patterns for Application Architecture with the ADO.NET EF DTL05-INT Surprise! It's the Entity Framework Gotchas DTL312 The ADO.NET Entity Framework: Tips and Tricks Birds of a Feather BOF21 Solving the Unforeseen Challenges of the ADO.NET Entity Framework: How Can.NET Developers Get Better Prepared? BOF65 Implementing the Entity Framework in an n-Tier World Hands-on Labs DTL20-HOL Application Development with the ADO.NET Entity Framework in the Microsoft.NET Framework 4.0

26. Track Resources Visit the DPR TLC for a chance to win a copy of Visual Studio Team Suite. Daily drawing occurs every day in the TLC at 4:15pm. Stop by for a raffle ticket http://www.microsoft.com/visualstudio http://www.microsoft.com/visualstudio/en- us/products/teamsystem/default.mspx Please visit us in the TLC blue area

27. www.microsoft.com/teched Sessions On-Demand & Community http://microsoft.com/technet Resources for IT Professionals http://microsoft.com/msdn Resources for Developers www.microsoft.com/learning Microsoft Certification and Training Resources www.microsoft.com/learning Microsoft Certification & Training Resources Resources

28. Complete an evaluation on CommNet and enter to win!

29. © 2009 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

30. PowerPoint Guidelines Subtitle color SampleSample SampleSample SampleSampleSampleSampleSampleSample Sample Sample Sample SampleSample SampleSample SampleSample SampleSample SampleSample SampleSample SampleSample SampleSample Sample Set as default shape SampleSample SampleSampleSampleSample Sample SampleSample SampleSampleSampleSample SampleSample SampleSampleSampleSample SampleSample SampleSample SampleSample SampleSample SampleSample Database SampleSample Itinerary Processing Resolvers Adapter Providers SampleSample

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49. www.microsoft.com/teched Sessions On-Demand & Community http://microsoft.com/technet Resources for IT Professionals http://microsoft.com/msdn Resources for Developers www.microsoft.com/learning Microsoft Certification & Training Resources Resources Required Slide Speakers, TechEd 2009 is not producing a DVD. Please announce that attendees can access session recordings at TechEd Online. Required Slide Speakers, TechEd 2009 is not producing a DVD. Please announce that attendees can access session recordings at TechEd Online. www.microsoft.com/learning Microsoft Certification and Training Resources

50. Related Content Breakout Sessions (session codes and titles) Interactive Theater Sessions (session codes and titles) Hands-on Labs (session codes and titles) Required Slide Speakers, please list the Breakout Sessions, TLC Interactive Theaters and Labs that are related to your session. Required Slide Speakers, please list the Breakout Sessions, TLC Interactive Theaters and Labs that are related to your session.

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53. © 2009 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION. Required Slide