Exam Ref 70-487: Developing Windows Azure and Web Services

Objective 2.1: Query and manipulate data by using the Entity Framework

Although the Entity Framework (EF) was covered in Chapter 1, this chapter covers specifics about EF and the components that compose it. To help you with your exam preparation, the focus is on version 5.0 of the .NET Framework.

This objective covers how to:

• Query, update, and delete data by using DbContext

• Build a query that uses deferred execution

• Implement lazy loading and eager loading

• Create and run compiled queries

• Query data by using Entity SQL

Querying, updating, and deleting data by using DbContext

Earlier versions of the EF made use of the ObjectContext class as the interaction point between the code and the data. Starting with version 5.0 of the EF, ObjectContext was replaced ...