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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 FREE CHAPTER 2. Implementing a Basic HelloWorld WCF Service 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

Extension methods


Extension methods are static methods that can be invoked using the instance method syntax. In effect extension methods make it possible for us to extend existing types and constructed types with additional methods.

For example, we can define an extension method as follows:

    public static class MyExtensions
    {
        public static bool IsCandy(this Product p)
        {
            if (p.ProductName.IndexOf("candy") >= 0)
                return true;
            else
                return false;
        }
    }

In this example the static method, IsCandy, takes a this parameter of Product type and searches for the word, candy, inside the product name. If it finds a match it assumes this is a candy product and returns true. Otherwise it returns false, meaning this is not a candy product.

Because all extension methods must be defined in top-level static classes here to simplify the example, we put this class inside the same namespace as our main test application, TestNewFeaturesApp...

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