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

Operators in LINQ

Operators are those that operate on operands to perform a certain task. Powered by a rich set of query operators and expressions, you can use LINQ with absolutely any data, such as relational databases and XML files. Moreover, LINQ is type safe and extensible.


It's worth noting that in some LINQ implementations, not every operator will be available.

LINQ offers a collection of powerful operators that make the task of querying data much easier. We will explore how we can work with LINQ operators in the sections that follow.


Most standard query operators operate on a sequence where the latter is an object of type IEnumerable<T> or the IQueryable<T> interfaces. The standard query operators can be divided into two groups. One group works on objects of type IEnumerable<T>, and the other group works with objects of type IQueryable<T>.


You can use the aggregation operator Sum in a LINQ to Entities query as shown here:

using (PayrollEntitiesvarentities...