Expert Business Objects

802 Pages·2008·23.45 MB·English

by  Susan Stevens

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Books for professionals By professionals® The eXperT’s Voice® in .neT
Companion
eBook Available
Expert C# 2008 Business Objects
Expert
Dear Reader,
This book is about application architecture, design, and development using
Expert
object-oriented concepts in .NET. Specifically, I’ll show how to build business- C
focused objects called business objects and how to use them to build applica-
tions with Windows Presentation Foundation (WPF), Web Forms, Windows
Communication Foundation (WCF), Windows Forms, Windows Workflow
Author of Foundation (WF), and other types of application. While this book is about the # C# 2008
creation of the CSLA .NET development framework, that framework is the codi-
Expert C# 2005
fication of an underlying architecture, which helps provide order to the chaos
Business Objects
and enables productive application of the architectural concepts.
You may agree or disagree with my views, and that is fine. In the end, having
an architecture that withstands the tests of time and technological change is
2
the key. At a minimum, the concepts, ideas, and techniques in this book will
help inform your understanding of architecture and will enable you to put all
the new and changing technologies into perspective.
The CSLA .NET framework itself is one of the most widely used development
0
frameworks on the .NET platform. In reading this book, you will see the design
Business Objects
decisions that enable the framework to support the many technologies listed
previously—all based on the same set of business objects. You’ll also learn how
the framework abstracts the concept of data access, enabling an application to 0
use nearly any data access technology available on the .NET platform.
Over the past eight years, CSLA .NET has evolved, and it continues to evolve
to support new capabilities of the .NET platform. The underlying architecture
of using object-oriented design in a distributed computing environment has 8
remained consistent all this time, and it continues to be critical looking forward
to Silverlight, Windows Azure, and beyond.
I hope you enjoy this book and find it challenging and educational. Code
Architect, design, and develop highly scalable and
well, have fun!
maintainable object-oriented business applications
OB
Rockford Lhotka
Companion eBook
bu
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See last page for details cn
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Expert C# 2008
Business Objects
■ ■ ■
Rockford Lhotka
Lhotka_1019-1FRONT.fm Page ii Thursday, November 20, 2008 5:04 PM
Expert C# 2008 Business Objects
Copyright © 2009 by Rockford Lhotka
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Lhotka_1019-1FRONT.fm Page iii Thursday, November 20, 2008 5:04 PM
To my Mom and Dad. Thank you for all you’ve taught me through the years!
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Contents at a Glance
About the Author . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix
About the Technical Reviewers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xxv
■ CHAPTER 1 Distributed Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
■ CHAPTER 2 Framework Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
■ CHAPTER 3 Object-Oriented Application Design . . . . . . . . . . . . . . . . . . . . . . . . . . 101
■ CHAPTER 4 CSLA .NET Object Stereotypes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
■ CHAPTER 5 CSLA .NET Object Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
■ CHAPTER 6 Business Framework Implementation . . . . . . . . . . . . . . . . . . . . . . . . 207
■ CHAPTER 7 Property Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
■ CHAPTER 8 Object Status Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
■ CHAPTER 9 Parent-Child Relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
■ CHAPTER 10 Data Binding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
■ CHAPTER 11 Business and Validation Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
■ CHAPTER 12 Authentication and Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
■ CHAPTER 13 N-Level Undo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
■ CHAPTER 14 LINQ to CSLA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399
■ CHAPTER 15 Persistence and the Data Portal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419
■ CHAPTER 16 Other Framework Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487
■ CHAPTER 17 Business Object Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 517
■ CHAPTER 18 Example Data Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 547
■ CHAPTER 19 Windows Presentation Foundation UI . . . . . . . . . . . . . . . . . . . . . . . . 583
■ CHAPTER 20 Web Forms UI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 619
■ CHAPTER 21 WCF Service Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 675
■ INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .719
v
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Contents
About the Author . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix
About the Technical Reviewers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xxv
■ CHAPTER 1 Distributed Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Logical and Physical Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
N-Tier and SOA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Complexity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Relationship Between Logical and Physical Models. . . . . . . . . . . . . . 4
A 5-Layer Logical Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Applying the Logical Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
The Way Ahead. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Managing Business Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Potential Business Logic Locations . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Business Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mobile Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Architectures and Frameworks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
■ CHAPTER 2 Framework Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Basic Design Goals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Validation and Business Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Tracking Whether the Object Has Changed. . . . . . . . . . . . . . . . . . . . 41
Integrated Authorization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Strongly Typed Collections of Child Objects . . . . . . . . . . . . . . . . . . . 42
N-Level Undo Capability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Simple and Abstract Model for the UI Developer . . . . . . . . . . . . . . . 45
Supporting Data Binding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Object Persistence and Object-Relational Mapping . . . . . . . . . . . . . 54
Custom Authentication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
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viii ■ CONTENTS
Designing the Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Business Object Creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
N-Level Undo Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Data Binding Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Business and Validation Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Data Portal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Custom Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Integrated Authorization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Helper Types and Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Namespace Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
■ CHAPTER 3 Object-Oriented Application Design . . . . . . . . . . . . . . . . . . . . . 101
Responsibility-Driven Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Use-Case or Story-Based Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . 102
Objects with Responsibilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Objects Exist for Use Cases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Normalization of Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Application Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Object Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Initial Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Revising the Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Custom Authentication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Using CSLA .NET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Database Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Creating the Databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
PTracker Database. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Security Database. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140