Book Image

WCF 4.0 Multi-tier Services Development with LINQ to Entities

By : Mike Liu
Book Image

WCF 4.0 Multi-tier Services Development with LINQ to Entities

By: Mike Liu

Overview of this book

WCF is the Microsoft model for building services, whereas LINQ to Entities is the Microsoft ORM for accessing underlying data storage. Want to learn both? You would normally have to dig through huge reference tomes—so wouldn't you agree that a simple-to-follow practical tutorial on WCF and LINQ to Entities is the way to get ahead?This book is the quickest and easiest way to learn WCF and LINQ to Entities in Visual Studio 2010. WCF and LINQ to Entities are both powerful yet complex technologies from Microsoft—but you will be surprised at how easily this book will get you get up and running with them.Mastery of these two topics will quickly enable you to create Service-Oriented applications, and allow you to take your first steps into the world of Service Oriented Architecture without becoming overwhelmed.Through this book, you will learn what's going on behind the scenes with WCF, and dive into the basic yet most useful techniques for LINQ to Entities. You will develop three real-world multi-tiered WCF services from beginning to end, with LINQ to Entities being used in the data access layer of the services. Various clients including windows console applications, the WCF Test Client, Windows Form applications and WPF applications will be created to test these WCF services. By the end of this book, you will be 100% confident that you know WCF and LINQ to Entities, not only in theory, but with sound real-world experience.
Table of Contents (16 chapters)
WCF 4.0 Multi-tier Services Development with LINQ to Entities
Credits
About the Author
About the Reviewers
Preface
Index

Adding a data access layer


We have two layers in our solution. We need to add one more layer—the data access layer. We need to query a real database to get the product information and update the database for a given product.

Creating the data access layer project

First we will create the project for the data access layer. As we did for the business logic layer, what we need to do is add a C# class library project named RealNorthwindDAL, where DAL stands for Data Access Layer, to the solution. Then rename the Class1.cs to ProductDAO.cs and modify it as follows:

  • Change its namespace from RealNorthwindDAL to MyWCFServices. RealNorthwindDAL.

  • Change the class name from Class1 to ProductDAO.

  • Add a reference to the project, RealNorthwindEntities.

Now let's modify ProductDAO.cs for our product service:

  • Add the following using statement:

    	using MyWCFServices.RealNorthwindEntities;
  • Add two new methods to the ProductDAO class. The first method is GetProduct, which should be as follows:

    	public ProductEntity...