Book Image

WCF 4.5 Multi-Layer Services Development with Entity Framework

By : Mike Liu
Book Image

WCF 4.5 Multi-Layer Services Development with Entity Framework

By: Mike Liu

Overview of this book

<p>WCF is Microsoft's recommended model for building services and Entity Framework is Microsoft’s preferred ORM for accessing underlying data storages. Learning WCF and Entity Framework has become essential and critical for every software developer to survive in this SOA world.<br /><br />WCF and Entity Framework are two powerful yet complex technologies, and there are huge reference tomes out there in the market for these two technologies. With this book, you won’t get overwhelmed or scared away by tons of references; instead, you will be given a simple, easy-to-follow approach to get started. For the code solutions within this book, unlike many other WCF and EF books, where you have just one code snippet after another code snippet, all solutions in this book are fully working and completely finished. These solutions are independent of each other, yet built on top of each other, and get more and more sophisticated as the book progresses, so you can learn more advanced WCF and EF techniques easily and quickly.<br /><br />This book is a step-by-step tutorial to guide you through learning WCF, Entity Framework, LINQ, and LINQ to Entities. You will be guided to create six WCF and Entity Framework solutions from scratch, of which three are multi-layered real-world WCF service solutions, so you will not only be reading, but also be coding through the book, to gain practical experience of WCF and Entity Framework. <br /><br />Various test clients will be associated with each solution and all solutions can be built and run independently of other solutions. Clear instructions and relevant screenshots will make sure you won't get lost in the world of WCF and Entity Framework. Configuration files, host applications, test clients, and WCF services for each solution will also be available for download for you to examine, modify, and debug from the outside in. <br /><br />The book focuses on the essentials of using WCF and Entity Framework, rather than providing a reference to every single possibility. It leaves the reference material online where it belongs, and concentrates instead on practical examples, code, and advice.</p>
Table of Contents (19 chapters)
WCF 4.5 Multi-Layer Services Development with Entity Framework
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Adding a data access layer


We have two layers—the service interface layer and the business logic layer—in our solution now. We need to add one more layer—the data access layer. Within this third layer, we will 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 we need to change the default class file to be our Data Access Object (DAO) file.

Now modify the Class1.cs file as follows:

  1. Rename it to ProductDAO.cs.

  2. Change its namespace from RealNorthwindDAL to MyWCFServices.RealNorthwindDAL.

  3. Change the class name from Class1 to ProductDAO.

  4. Add a RealNorthwindBDO reference to the project.

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

  1. Add the following using statement:

    using...