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WCF 4.0 Multi-tier Services Development with LINQ to Entities

You're reading from   WCF 4.0 Multi-tier Services Development with LINQ to Entities Build SOA applications on the Microsoft platform with this hands-on guide updated for VS2010

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Product type Paperback
Published in Jun 2010
Publisher Packt
ISBN-13 9781849681148
Length 348 pages
Edition 1st Edition
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Author (1):
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Mike Liu Mike Liu
Author Profile Icon Mike Liu
Mike Liu
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Table of Contents (16) Chapters Close

WCF 4.0 Multi-tier Services Development with LINQ to Entities
Credits
About the Author
About the Reviewers
Preface
1. Introducing Web Services and Windows Communication Foundation 2. Implementing a Basic HelloWorld WCF Service FREE CHAPTER 3. Hosting and Debugging the HelloWorld WCF Service 4. Implementing a WCF Service in the Real World 5. Adding Database Support and Exception Handling to the RealNorthwind WCF Service 6. LINQ—Language Integrated Query 7. LINQ to Entities: Basic Concepts and Features 8. LINQ to Entities: Advanced Concepts and Features 9. Applying LINQ to Entities to a WCF Service 10. Distributed Transaction Support of WCF Index

Comparing LINQ to Entities with LINQ to Objects


In the previous chapter, we used LINQ to query in-memory objects. Before we dive further into the world of LINQ to Entities we first need to look at the relationships between LINQ to Entities and LINQ to Objects.

Some key differences between LINQ to Entities and LINQ to Objects are:

  • LINQ to Entities needs an Object Context object. The ObjectContext object is the bridge between LINQ and the database (we will explain more about ObjectContext later). LINQ to Objects doesn't need any intermediate LINQ provider or API.

  • LINQ to Entities returns data of type, IQueryable<T>, whereas LINQ to Objects returns data of type, IEnumerable<T>.

  • LINQ to Entities queries are translated to SQL by way of Expression Trees, which allow them to be evaluated as a single unit and translated to appropriate and optimal SQL Statements. LINQ to Objects queries do not need to be translated.

  • LINQ to Entities queries are translated to SQL calls and executed on the...

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