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
About the Author
About the Reviewers

Adding concurrency support

You may have noticed that in the section, Modifying UpdateProduct in the data access layer, we commented out a line of code about the RowVersion in the ProductDAO.cs file. This is because in our ProductEntity class there is no property for RowVersion. Concurrent updates are not supported by this service now. Next we will modify a few classes to add concurrent update control.

Turning on RowVersion concurrency mode

At the beginning of this chapter, when we added the Products table to our entity data model, we didn't turn on concurrency mode for the RowVersion column, even though its data type is timestamp. We just changed the data access layer from ADO.NET to LINQ to Entities without concurrency control. Even if we had turned on concurrency mode for the RowVersion column on the Entity data model at that time, we still wouldn't have concurrency control. We need to modify a few more classes to achieve concurrency control. In this section we will explain how to add concurrency...