Programming Entity Framework - Cdn.oreilly.com

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Using BindingSourceControls with the DataBridge 666 Instantiating the DataBridge Class in the Form 666 Populating the Form with an Entity and Its Related Data 667 Consuming the Pick Lists in the Form 669 Deleting from Grids When EntityCollections and Referential Constraints Are Involved 670 Allowing Users to Roll Back Their Edits 675 Helping the User Who Forgets to Save Changes 676 Summary 677 21. Using the Entity Framework in n-Tier ASP.NET Applications . . . . . . . . . . . . . . . . . . 679 Understanding How an ObjectContext Fits into the Web Page Life Cycle 680 Using EntityObjects in Read-Only Web Pages 681 Exploring Options for Updating Entities in an ASP.NET Application 684 Evaluating ASP.NET’s State Solutions Against the Entity Framework 685 Introducing ASP.NET’s ObjectDataSource Control 689 Why ObjectDataSource? 689 ObjectDataSource Enforces Its Rules on Your Objects 689 How the ObjectDataSource Gets Data into and out of the Data-Binding Controls 690 Designing Object Provider Classes to Be Used with an ObjectDataSource 691 Creating the CustomerProvider Class 692 Creating the AddressProvider Class 697 Creating the ReservationsProvider Class 701 Providing Reusable, Cached Reference Lists 702 Wiring Up the Provider Classes to ObjectDataSource Controls 704 Using the ObjectDataSource Wizard to Perform the Initial Wiring to the Provider Classes 705 Tweaking ObjectDataSource Properties to Work with Entities 705 Using ObjectDataSource Events to Solve Problems That Are Particular to Entities 706 Understanding Why We Didn’t Use Object Graphs in This Business Layer 713 Database Hits Versus Very Busy Memory 713 Summary 714 22. Implementing a Smarter WCF Service for Working with Entities . . . . . . . . . . . . . . 717 Will Your Client Agree to Your Data Contract? 718 Shipping DTOs, Not EntityObjects 719 Building a Data Transfer Object to Take the Place of an Entity Object 719 Creating EntityState Properties That Do Not Rely on ObjectContext 722 The EntityStateLocal Enums and Interface 723 Implementing the IEntityStateLocal Interface in the DTO Classes 724 Implementing the IEntityStateLocal Interface in the Entity Classes 724 Table of Contents | xix
Designing the Service Interface 725 Implementing the Service Operations 726 Returning CustomerList as ShortCustomers with GetCustomerList 727 Returning Additional Reference Lists 727 Returning a Single Entity Graph for Editing with GetCustomer 728 Building Methods to Create DTOs from Entity Objects 730 Initializing the DTO Children 732 Saving Edits Sent Back from the Client with SaveCustomer 733 Building the Main Method for Updating the Graph: SaveCustomer 735 UpdateChildren 740 Implementing the Client That Will Use the WCF Service 742 Rules for the Client to Follow 742 Building a Business Layer Between the UI and the Services 743 What’s in These Business Classes? 743 Calling the Service Operations from the Business Layer 747 Testing It All with a Simple Console Application 749 Summary 751 23. The Entity Framework, Today and Tomorrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 753 What About Building Reports with the Entity Framework? 753 Major Differences Between the Entity Framework and LINQ to SQL 754 Extensions, Samples, and Solutions from Microsoft 755 Extensions and APIs 755 Samples 756 Learning Tools 757 Entity Framework v.Next 757 The Transparent Design Process for the Next Version 758 Blogs, Forums, and Other Resources 758 Appendix: Entity Framework Assemblies and Namespaces . . . . . . . . . . . . . . . . . . . . . . . . . 759 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 763 xx | Table of Contents
Page 1 and 2: Free Sampler
Page 3 and 4: Programming Entity Framework by Jul
Page 5 and 6: The EDM Within the Entity Framework
Page 7 and 8: Retrieving a Single Entity with Get
Page 9 and 10: Breaking Apart the ObjectQuery 222
Page 11 and 12: Using a New EntityDataSource to Add
Page 13 and 14: Insert, Update, and Delete Function
Page 15 and 16: Digging Through ObjectStateEntry 53
Page 17: 19. Using Your Own Custom Classes .
Page 21 and 22: In addition to POCO support, the te
Page 23 and 24: using System.Text; namespace Chapte
Page 25 and 26: } } public ObjectSet Addresses { ge
Page 27 and 28: } If you run the code now, you will
Page 29 and 30: Using Proxies to Enable Change Noti
Page 31 and 32: Figure 13-2. A high-level view of t
Page 33 and 34: Rule 2: To enable lazy loading on a
Page 35 and 36: using System.Collections.ObjectMode
Page 37 and 38: Modifying the POCO Template Althoug
Page 39 and 40: The next step is to modify the temp
Page 41 and 42: get; set; } public string Street1 {
Page 43: Want to read more? You can find thi

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