Welcome to LINQ in Action. This book is an introduction to the Microsoft .NET
LINQ technology and the rich toolset that comes with it.
LINQ stands for Language INtegrated Query. In a nutshell, it makes query operations
like SQL statements into first-class citizens in .NET languages like C# and VB.
LINQ offers built-in support for querying in-memory collections such as arrays or
lists, XML, DataSets, and relational databases. But LINQ is extensible and can be
used to query various data sources.
Our goal with this book is to help developers who have an existing knowledge
of the .NET Framework and the C# or VB.NET language to discover the concepts
introduced by LINQ and gain a complete understanding of how the technology
works, as well as how to make the best of it in their projects.
LINQ in Action covers the entire LINQ spectrum. From Hello World code samples
and the new C# 3.0 and VB.NET 9.0 features to LINQ’s extensibility and a tour of all
the LINQ providers, this book has everything you need to get up to speed with LINQ
and to be able to create applications that take advantage of it.
We believe this book provides the right mix of theory and examples. We made
sure to keep the focus on the practical side of things, because we think that nothing’s
better than a hands-on exploration of the technology. Several additions have
been made to the C# and VB.NET languages, as well as to the .NET class library. But
fear not: These language innovations aren’t difficult to grasp when you have the
right code sample in front of you.
ABOUT THIS BOOK xxiii
We’ll guide you along as you make your way through this new world where beasts
like lambda expressions, query operators, and expression trees live. You’ll discover all the
basics of LINQ that’ll help you form a clear understanding of the complete LINQ
toolset. We’ll also provide a presentation of the common use cases for all the flavors
of LINQ. Whether you want to use LINQ to query objects, XML documents, or relational
databases, you’ll find all the information you’ll need. But we won’t stop at the
basic code. We’ll also show you how LINQ can be used for advanced data processing.
This includes coverage of LINQ’s extensibility, which allows us to query more data
sources than those supported by default.
In order to base our code samples on concrete business classes, we’ll use a running
example. This example, LinqBooks, is a personal book-cataloging system.
This means that the LINQ queries you’ll see throughout the book will deal with
objects such as Book, Publisher, and Author. The running example we’ve chosen
is broad enough to involve all aspects of LINQ. We’ll progressively build the sample
application throughout the chapters, finishing with a complete application in
the last chapter.
LINQ technology and the rich toolset that comes with it.
LINQ stands for Language INtegrated Query. In a nutshell, it makes query operations
like SQL statements into first-class citizens in .NET languages like C# and VB.
LINQ offers built-in support for querying in-memory collections such as arrays or
lists, XML, DataSets, and relational databases. But LINQ is extensible and can be
used to query various data sources.
Our goal with this book is to help developers who have an existing knowledge
of the .NET Framework and the C# or VB.NET language to discover the concepts
introduced by LINQ and gain a complete understanding of how the technology
works, as well as how to make the best of it in their projects.
LINQ in Action covers the entire LINQ spectrum. From Hello World code samples
and the new C# 3.0 and VB.NET 9.0 features to LINQ’s extensibility and a tour of all
the LINQ providers, this book has everything you need to get up to speed with LINQ
and to be able to create applications that take advantage of it.
We believe this book provides the right mix of theory and examples. We made
sure to keep the focus on the practical side of things, because we think that nothing’s
better than a hands-on exploration of the technology. Several additions have
been made to the C# and VB.NET languages, as well as to the .NET class library. But
fear not: These language innovations aren’t difficult to grasp when you have the
right code sample in front of you.
ABOUT THIS BOOK xxiii
We’ll guide you along as you make your way through this new world where beasts
like lambda expressions, query operators, and expression trees live. You’ll discover all the
basics of LINQ that’ll help you form a clear understanding of the complete LINQ
toolset. We’ll also provide a presentation of the common use cases for all the flavors
of LINQ. Whether you want to use LINQ to query objects, XML documents, or relational
databases, you’ll find all the information you’ll need. But we won’t stop at the
basic code. We’ll also show you how LINQ can be used for advanced data processing.
This includes coverage of LINQ’s extensibility, which allows us to query more data
sources than those supported by default.
In order to base our code samples on concrete business classes, we’ll use a running
example. This example, LinqBooks, is a personal book-cataloging system.
This means that the LINQ queries you’ll see throughout the book will deal with
objects such as Book, Publisher, and Author. The running example we’ve chosen
is broad enough to involve all aspects of LINQ. We’ll progressively build the sample
application throughout the chapters, finishing with a complete application in
the last chapter.
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