Agile Principles, Patterns, and Practices in C#

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9780131857254: Agile Principles, Patterns, and 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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About the Author:

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.



Excerpt. © Reprinted by permission. All rights reserved.:

But Bob, you said you’d be done with the book last year.
—Claudia Frers, UML World, 1999

Bob’s Introduction

It’s been seven years since Claudia’s justifiable complaint, but I think I have made up for it. Publishing three books—one book every other year while running a consulting company and doing a lot of coding, training, mentoring, speaking, and writing articles, columns, and blogs—not to mention raising a family and enjoying a grandfamily can be quite a challenge. But I love it.

Agile development is the ability to develop software quickly, in the face of rapidly changing requirements. In order to achieve this agility, we need to use practices that provide the necessary discipline and feedback. We need to employ design principles that keep our software flexible and maintainable, and we need to know the design patterns that have been shown to balance those principles for specific problems. This book is an attempt to knit all three of these concepts together into a functioning whole.

This book describes those principles, patterns, and practices and then demonstrates how they are applied by walking through dozens of different case studies. More important, the case studies are not presented as complete works. Rather, they are designs in progress. You will see the designers make mistakes and observe how they identify them as mistakes and eventually correct them. You will see the designers puzzle over conundrums and worry over ambiguities and trade-offs. You will see the act of design.

Micah’s Introduction

In early 2005, I was on a small development team that began work on a .NET application to be written in C#. Using agile development practices was mandatory, which is one of the reasons I was involved. Although I had used C# before, most of my programming experience was in Java and C++. I didn’t think that working in .NET would make much difference; in the end it didn’t.

Two months into the project, we made our first release. It was a partial release containing only a fraction of all the intended features, but it was enough to be usable. And use it they did. After only two months, the organization was reaping the benefits of our development. Management was so thrilled that it asked to hire more people so we could start more projects.

Having participated in the agile community for years, I knew a good many agile developers who could help us. I called them all and asked them to join us. Not one of my agile colleagues ended up joining our team. Why not? Perhaps the most overwhelming reason was the fact that we were developing in .NET.

Almost all agile developers have a background in Java, C++, or Smalltalk. But agile .NET programmers are almost unheard of. Perhaps my friends didn’t take me seriously when I said we were doing agile software development with .NET, or maybe they were avoiding association with .NET. This was a significant problem. It was not the first evidence I’d seen of this problem, either.

Teaching week-long courses on various software topics allows me to meet a wide cross-section of developers from around the world. Many of the students I’ve instructed were .NET programmers, and many were Java or C++ programmers. There’s no gentle way to put this: In my experience, .NET programmers are often weaker than Java and C++ programmers. Obviously, this is not always the case. However, after observing it over and over in my classes, I can come to no other conclusion: .NET programmers tend to be weaker in agile software practices, design patterns, design principles, and so on. Often in my classes, the .NET programmers had never heard of these fundamental concepts. This has to change.

The first edition of this book, Agile Software Development: Principles, Patterns, and Practices, by Robert C. Martin, my father, was published in late 2002 and won the 2003 Jolt Award. It is a great book, celebrated by many developers. Unfortunately, it had little impact on the .NET community. Despite the fact that the content of the book is equally relevant to .NET, few .NET programmers have read it.

It is my hope that this .NET edition acts as a bridge between .NET and the rest of the developer community. I hope that programmers will read it and see that there are better ways to build software. I hope that they will begin using better software practices, creating better designs, and raising the bar for quality in .NET applications. I hope that .NET programmers will not be weaker than other programmers. I hope that .NET programmers achieve a new status in the software community such that Java developers are proud to join a .NET team.

Throughout the process of putting this book together, I struggled many times with the concept of my name being on the cover of a .NET book. I questioned whether I wanted my name associated with .NET and all the negative connotations that seemed to come with it. Yet I can no longer deny it. I am a .NET programmer. No! An agile .NET programmer. And I’m proud of it.

About This Book

A Little History

In the early 1990s I (Bob) wrote Designing Object-Oriented C++ Applications Using the Booch Method. That book was something of a magnum opus for me, and I was very pleased with the result and the sales.

The book you are reading started out as a second edition to Designing, but that’s not how it turned out. Very little remains of the original book in these pages. Little more than three chapters have been carried through, and those have been massively changed. The intent, spirit, and many of the lessons of the book are the same. In the decade since Designing came out, I’ve learned a tremendous amount about software design and development. This book reflects that learning.

What a decade! Designing came out just before the Internet collided with the planet. Since then, the number of acronyms we have to deal with has doubled. We have EJB, RMI, J2EE, XML, XSLT, HTML, ASP, JSP, ZOPE, SOAP, C#, and .NET, as well as Design Patterns, Java, Servelets, and Application Servers. Let me tell you, it’s been difficult to keep the chapters of this book current.

The Booch connection In 1997, I was approached by Grady Booch to help write the third edition of his amazingly successful Object-Oriented Analysis and Design with Applications. I had worked with Grady before on some projects and had been an avid reader and contributor to his various works, including UML. So I accepted with glee and asked my good friend Jim Newkirk to help out with the project.

Over the next two years, Jim and I wrote a number of chapters for the Booch book. Of course, that effort meant that I could not put as much effort into this book as I would have liked, but I felt that the Booch book was worth contributing to. Besides, at the time, this book was simply a second edition of Designing, and my heart wasn’t in it. If I was going to say something, I wanted to say something new and different.

Unfortunately, the Booch book was not to be. It is difficult to find the time to write a book during normal times. During the heady days of the dot-com bubble, it was nearly impossible. Grady got ever busier with Rational and with new ventures such as Catapulse. So the project stalled. Eventually, I asked Grady and Addison-Wesley whether I could have the chapters that Jim and I wrote to include in this book. They graciously agreed. So several of the case study and UML chapters came from that source.

The impact of Extreme Programming In late 1998, XP reared its head and challenged our cherished beliefs about software development. Should we create lots of UML diagrams prior to writing any code? Or should we eschew any kind of diagrams and simply write lots of code? Should we write lots of narrative documents that describe our design? Or should we try to make the code narrative and expressive so that ancillary documents aren’t necessary? Should we program in pairs? Should we write tests before we write production code? What should we do?

This revolution came at an opportune time. During the middle to late 1990s, Object Mentor was helping quite a few companies with OO design and project management issues. We were helping companies get their projects done. As part of that help, we instilled into the teams our own attitudes and practices. Unfortunately, these attitudes and practices were not written down. Rather, they were an oral tradition that was passed from us to our customers.

By 1998, I realized that we needed to write down our process and practices so that we could better articulate them to our customers. So I wrote many articles about process in the C++ Report. 1 These articles missed the mark. They were informative and in some cases entertaining, but instead of codifying the practices and attitudes that we used in our projects, they were an unwitting compromise to values that had been imposed on me for decades. It took Kent Beck to show me that.

The Beck connection In late 1998, at the same time I was fretting over codifying the Object Mentor process, I ran into Kent’s work on Extreme Programming (XP). The work was scattered through Ward Cunningham’s wiki 2 and was mixed with the writings of many others. Still, with some work and diligence, I was able to get the gist of what Kent was talking about. I was intrigued but skeptical. Some of the things that XP talked about were exactly on target for my concept of a development process. Other things, however, such as the lack of an articulated design step, left me puzzled.

Kent and I could not have come from more disparate software circumstances. He was a recognized Smalltalk consultant, and I was a recognized C++ consultant. Those two worlds found it difficult to communicate with each other. There was an almost Kuhnian3 paradigm gulf between them.

Under other circumstances, I would never have asked Kent to write an article for the C++ Report. But the congruence of our thinking about process was able to breech the language gulf. In February 1999, I met Kent in Munich at the OOP conference. He was giving a talk on XP in the room across from where I was giving a talk on principles of OOD. Being unable to hear that talk, I sought Kent out at lunch. We talked about XP, and I asked him to write an article for the C++ Report. It was a great article about an incident in which Kent and a coworker had been able to make a sweeping design change in a live system in a matter of an hour or so.

Over the next several months, I went through the slow process of sorting out my own fears about XP. My greatest fear was in adopting a process in which there is no explicit upfront design step. I found myself balking at that. Didn’t I have an obligation to my clients, and to the industry as a whole, to teach them that design is important enough to spend time on?

Eventually, I realized that I did not really practice such a step myself. Even in all the article and books I had written about design, Booch diagrams, and UML diagrams, I had always used code as a way to verify that the diagrams were meaningful. In all my customer consulting, I would spend an hour or two helping them to draw diagrams and then direct them to explore those diagrams with code. I came to understand that though XP’s words about design were foreign, in a Kuhnian4 sense, the practices behind the words were familiar to me.

My other fears about XP were easier to deal with. I had always been a closet pair programmer. XP gave me a way to come out of the closet and revel in my desire to program with a partner. Refactoring, continuous integration, customer onsite: All were very easy for me to accept. They were very close to the way I already advised my customers to work.

One practice of XP was a revelation for me. Test-driven development (TDD5) sounds innocuous when you first hear it: Write test cases before you write production code. All production code is written to make failing test cases pass. I was not prepared for the profound ramifications that writing code this way would have. This practice has completely transformed the way I write software: transformed it for the better.

So by fall of 1999, I was convinced that Object Mentor should adopt XP as its process of choice and that I should let go of my desire to write my own process. Kent had done an excellent job of articulating the practices and process of XP; my own feeble attempts paled in comparison.

.NET A war is going on among major corporations. These corporations are fighting to gain your allegiance. These corporations believe that if they own the language, they’ll own the programmers and the companies that employ those programmers.

The first volley of this war was Java. Java was the first language created by a major corporpation for the purpose of gaining programmer mindshare. This turned out to be wildly successful. Java has indeed penetrated very deeply into the software community and is largely the de facto standard for modern multilayer IT applications.

One responding volley comes from IBM, which via the Eclipse environment is capturing a large segment of the Java market. The other significant barrage comes from those consumate elaborators at Microsoft who have given us .NET in general and C# in particular.

Amazingly, it is very difficult to differentiate between Java and C#. The languages are semantically equivalent and syntactically so similar that many code snippets are indistinguishable. What Microsoft lacks in technical innovation, it more than makes up for in its remarkable ability to play catch-up and win.

The first edition of this book was written using Java and C++ as the coding language. This book is written using C# and the .NET platform. This should not be viewed as an endorsement. We are not taking sides in this war. Indeed, I think that the war itself will burn itself out when a better language surfaces in the next few years and captures the mindshare of the programmers that the warring corporations have spent so much to secure.

The reason for a .NET version of this book is to reach the .NET audience. Although the principles, patterns, and practices in this book are language agnostic, the case studies are not. Just as .NET programmers are more comfortable reading .NET case studies, Java progarmmers are more comfortable reading Java examples.

The Devil Is in the Details

This book contains a lot of .NET code. We hope that you will carefully read that code, since to a large degree, the code is the point of the book. The code is the actualization of what this book has to say.

This book has a repeating pattern: a series of case studies of varying sizes. Some are very small, and some require several chapters to describe. Each case study is preceded by material that is meant to prepare you for it by describing the object-oriented design principles and patterns used in that case study.

The book begins with a discussion on development practices and processes. That discussion is punctuated by a number of small case studies and examples. From there, the book moves on to the topic of design and design principles and then to some design patterns, more design principles that govern packages, and more patterns. All these topics are attended by case studies.

So prepare yourself to read some code and to pore over some UML diagrams. The book you are about to read is very technical, and its lessons, like the devil, are in the details.

Organization

This book is organized into four sections and two appendixes.

Sectio...

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