Book Image

Entity Framework Tutorial (Update) - Second Edition

By : Joydip Kanjilal
Book Image

Entity Framework Tutorial (Update) - Second Edition

By: Joydip Kanjilal

Overview of this book

The ADO.NET Entity Framework from Microsoft is a new ADO.NET development framework that provides a level of abstraction for data access strategies and solves the impedance mismatch issues that exist between different data models This book explores Microsoft’s Entity Framework and explains how it can used to build enterprise level applications. It will also teach you how you can work with RESTful Services and Google’s Protocol Buffers with Entity Framework and WCF. You will explore how to use Entity Framework with ASP.NET Web API and also how to consume the data exposed by Entity Framework from client applications of varying types, i.e., ASP.NET MVC, WPF and Silverlight. You will familiarize yourself with the new features and improvements introduced in Entity Framework including enhanced POCO support, template-based code generation, tooling consolidation and connection resiliency. By the end of the book, you will be able to successfully extend the new functionalities of Entity framework into your project.
Table of Contents (16 chapters)
Entity Framework Tutorial Second Edition
About the Author
About the Reviewers

Chapter 7. Working with the Object Services Layer

We explored multiple features of Entity Framework in the last few chapters. We had a look at the Object Service Layer and the consolidated programming model it presents in the form of strongly-typed objects. With this, you can represent entities as object instances of data classes mapping to the entity types in the model. The Object Service Layer can keep track of changes made to the objects in-memory and update the database accordingly. The results of the execution of a query in the EDM are available as objects—this enables you to have the option to choose either from EntityClient or Object Services in your application.

In this chapter, we will explore Object Services and how they can be used to perform CRUD operations against the Entity Data Model. Object Services provide services such as identity resolution, change tracking, object persistency, and also update processing. The Object Services Layer internally uses an ObjectQuery object for...