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

Objective 2.3: Query data by using LINQ to Entities

It should be clear by now that LINQ doesn’t have to be used with the EF or vice versa, but each complements the other very well. Instead of using the ADO.NET libraries and traditional data structures to populate and manipulate objects, LINQ makes the job much easier. As you’ll see, it is not an either/or situation; LINQ and EF work well with each other.

This objective covers how to:

• Query data using LINQ operators (for example, project, skip, aggregate, filter, and join)

• IQueryable versus IEnumerable

• Log queries

Querying data using LINQ operators

Unlike the current version of the EF, LINQ to Entities enables similar behavior, but items derive from the ObjectContext class.

Remember that a LINQ query ...