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Source Code

The NavigationWithLinqToXml to XML example can be found under the Chapter 24

subdirectory.

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8849CH24.qxd  10/19/07  10:11 AM  Page 864

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Summary

This chapter extended your understanding of LINQ by introducing three LINQ-centric APIs. We

began by examining how to transform an ADO.NET DataSet into a LINQ-compatible container

using the AsEnumerable() extension method. Once you have extracted an IEnumerable type, you

are able to apply any flavor of LINQ query.

Closely related to LINQ to DataSet is the LINQ to SQL API. This aspect of LINQ not only allows

you to apply query expressions to data held within relational databases, it also provides infrastruc-

ture that essentially encapsulates all trace of the underlying ADO.NET data types. As you have seen,

the DataContext type can be used to perform all of the expected database operations, including

invoking stored procedures.

We wrapped up by examining LINQ to XML. Similar to LINQ to SQL, this API can be used either

to apply LINQ queries to data within an XML document or to build XML documents in a functional

manner. The end result is an extreme simplification of how the .NET platform supports the manipu-

lation of XML documents.

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