Design Patterns

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C# 3.0 Design Patterns

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C# 3.0 Design Patterns

Judith Bishop

Beijing • Cambridge • Farnham • Köln • Paris • Sebastopol • Taipei • Tokyo

C# 3.0 Design Patterns
by Judith Bishop
Copyright © 2008 Judith Bishop. All rights reserved. Printed in the United States of America. Published byO’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (safari.oreilly.com). For more information, contact our corporate/institutional sales department: (800) 998-9938 or corporate@oreilly.com.

Editor: John Osborn Production Editor: Loranah DimantCopyeditor: Rachel Wheeler Proofreader: Loranah Dimant Printing History:
December 2007: First Edition.

Indexer: John Bickelhaupt Interior Designer: David Futato Cover Illustrator: Karen Montgomery Illustrator: Jessamyn Read

Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. C# 3.0 Design Patterns, the image of a greylaggoose, and related trade dress are trademarks of O’Reilly Media, Inc. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in thepreparation of this book, the publisher and author assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.

This book uses RepKover™ a durable and flexible lay-flat binding. , ISBN 10: 0-596-52773-X ISBN 13: 978-0-596-52773-0 [M]

In memory of my beloved father, Tom Mullins (1920–2007).

Table of Contents

Foreword . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv 1. C# Meets Design Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About Patterns AboutUML About C# 3.0 About the Examples 2 3 5 6

2. Structural Patterns: Decorator, Proxy, and Bridge . . . . . . . . . . . . . . . . . . . . . . . 8
Decorator Pattern Proxy Pattern Bridge Pattern Example: OpenBook Pattern Comparison 9 22 36 39 46

3. Structural Patterns: Composite and Flyweight . . . . . . . . . . . . . . . . . . . . . . . . . 49
Composite Pattern Flyweight Pattern...