Agile Principles, Patterns, Practices in C#

With the award-winning book Agile Software Development: Principles, Patterns, and Practices, Robert C. Martin helped bring Agile principles to tens of thousands of Java and C++ programmers. Now .NET programmers have a definitive guide to agile methods with this completely updated volume from Robert C. Martin and Micah Martin, Agile Principles, Patterns, and Practices in C#.

This book presents a series of case studies illustrating the fundamentals of Agile development and Agile design, and moves quickly from UML models to real C# code. The introductory chapters lay out the basics of the agile movement, while the later chapters show proven techniques in action. The book includes many source code examples that are also available for download from the authors Web site.

Readers will come away from this book understanding

• Agile principles, and the fourteen practices of Extreme Programming
• Spiking, splitting, velocity, and planning iterations and releases
• Test-driven development, test-first design, and acceptance testing
• Refactoring with unit testing
• Pair programming
• Agile design and design smells
• The five types of UML diagrams and how to use them effectively
• Object-oriented package design and design patterns
• How to put all of it together for a real-world project

Whether you are a C# programmer or a Visual Basic or Java programmer learning C#, a software development manager, or a business analyst, Agile Principles, Patterns, and Practices in C# is the first book you should read to understand agile software and how it applies to programming in the .NET Framework.

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Robert C. Martin has been a software professional since 1970 and an international software consultant since 1990. He is founder and president of Object Mentor, Inc., a team of experienced consultants who mentor their clients in the fields of C++, Java, OO, Patterns, UML, Agile Methodologies, and Extreme Programming.Micah Martin works with Object Mentor as a developer, consultant, and mentor on topics ranging from object-oriented principles and patterns to agile software development practices. Micah is the cocreator and lead developer of the open source FitNesse project. He is also a published author and speaks regularly at conferences.

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Forewords xixPreface xxiiiAcknowledgments xxxiAbout the Authors xxxiiiSection I: Agile Development 1Chapter 1: Agile Practices 3

The Agile Alliance 4

Principles 8

Conclusion 10

Bibliography 11

Chapter 2: Overview of Extreme Programming 13

The Practices of Extreme Programming 14

Conclusion 22

Bibliography 22

Chapter 3: Planning 23

Initial Exploration 24

Release Planning 25

Iteration Planning 25

Defining Done 26

Task Planning 26

Iterating 27

Tracking 28

Conclusion 29

Bibliography 29

Chapter 4: Testing 31

Test-Driven Development 32

Acceptance Tests 36

Serendipitous Architecture 37

Conclusion 38

Bibliography 39

Chapter 5: Refactoring 41

A Simple Example of Refactoring: Generating Primes 42

Conclusion 53

Bibliography 54

Chapter 6: A Programming Episode 55

The Bowling Game 56

Conclusion 98

Overview of the Rules of Bowling 99

Section II: Agile Design 101Chapter 7: What Is Agile Design? 103

Design Smells 104

Why Software Rots 107

The Copy Program 108

Conclusion 113

Bibliography 114

Chapter 8: The Single-Responsibility Principle (SRP) 115

Defining a Responsibility 117

Separating Coupled Responsibilities 119

Persistence 119

Conclusion 119

Bibliography 120

Chapter 9: The Open/Closed Principle (OCP) 121

Description of OCP 122

The Shape Application 124

Conclusion 132

Bibliography 133

Chapter 10: The Liskov Substitution Principle (LSP) 135

Violations of LSP 136

Factoring Instead of Deriving 148

Heuristics and Conventions 150

Conclusion 151

Bibliography 151

Chapter 11: The Dependency-Inversion Principle (DIP) 153

Layering 154

A Simple DIP Example 157

The Furnace Example 160

Conclusion 161

Bibliography 162

Chapter 12: The Interface Segregation Principle (ISP) 163

Interface Pollution 163

Separate Clients Mean Separate Interfaces 165

Class Interfaces versus Object Interfaces 166

The ATM User Interface Example 169

Conclusion 174

Bibliography 175

Chapter 13: Overview of UML for C# Programmers 177

Class Diagrams 180

Object Diagrams 182

Collaboration Diagrams 183

State Diagrams 184

Conclusion 185

Bibliography 185

Chapter 14: Working with Diagrams 187

Why Model? 187

Making Effective Use of UML 189

Iterative Refinement 194

When and How to Draw Diagrams 200

Conclusion 202

Chapter 15: State Diagrams 203

The Basics 204

Using FSM Diagrams 208

Conclusion 209

Chapter 16: Object Diagrams 211

A Snapshot in Time 212

Active Objects 213

Conclusion 217

Chapter 17: Use Cases 219

Writing Use Cases 220

Diagramming Use Cases 222

Conclusion 223

Bibliography 223

Chapter 18: Sequence Diagrams 225

The Basics 226

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