Book Image

.NET Design Patterns

By : Praseed Pai, Shine Xavier
Book Image

.NET Design Patterns

By: Praseed Pai, Shine Xavier

Overview of this book

Knowing about design patterns enables developers to improve their code base, promoting code reuse and making their design more robust. This book focuses on the practical aspects of programming in .NET. You will learn about some of the relevant design patterns (and their application) that are most widely used. We start with classic object-oriented programming (OOP) techniques, evaluate parallel programming and concurrency models, enhance implementations by mixing OOP and functional programming, and finally to the reactive programming model where functional programming and OOP are used in synergy to write better code. Throughout this book, we’ll show you how to deal with architecture/design techniques, GoF patterns, relevant patterns from other catalogs, functional programming, and reactive programming techniques. After reading this book, you will be able to convincingly leverage these design patterns (factory pattern, builder pattern, prototype pattern, adapter pattern, facade pattern, decorator pattern, observer pattern and so on) for your programs. You will also be able to write fluid functional code in .NET that would leverage concurrency and parallelism!

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Table of Contents (22 chapters)
.NET Design Patterns
.NET Design Patterns
Credits
Credits
Foreword
Foreword
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
An Introduction to Patterns and Pattern Catalogs
An Introduction to Patterns and Pattern Catalogs
OOP - A short history
Patterns and pattern movement
Should we use all of these?
The C# language and the .NET platform
C# language and the singleton pattern
Summary
2
Why We Need Design Patterns?
Why We Need Design Patterns?
Some principles of software development
Why are patterns required?
A quick foray into the .NET Reflection API
Personal income tax computation - A case study
Finalizing the solution
Summary
3
A Logging Library
A Logging Library
Requirements for the library
Solutions approach
Writing content to a media
The factory method pattern for instantiation
A log server for network logging
A simple client program to test the library
Summary
4
Targeting Multiple Databases
Targeting Multiple Databases
Requirements for the library
Solutions approach
Summary
5
Producing Tabular Reports
Producing Tabular Reports
Requirements for the library
Solutions approach
iTextSharp for the PDF output
Composite and visitor pattern - A quick primer
The composite pattern and document composition
Visitor pattern for document traversal
The client program
Summary
6
Plotting Mathematical Expressions
Plotting Mathematical Expressions
Requirements for the expressions library and app
Solutions approach
The graph plotter application
The observer pattern for UI events
The expression evaluator and interpreter pattern
The abstract syntax tree (AST)
The grammar of expressions
Lexical analysis
The parser module
The builder, facade, and expression APIs
Summary
7
Patterns in the .NET Base Class Library
Patterns in the .NET Base Class Library
Adapter pattern in the .NET BCL
Strategy pattern in the .NET BCL
Builder pattern in the .NET BCL
Decorator pattern in the .NET BCL
Chain of responsibility pattern in ASP.net
Bridge pattern in the .NET RCW
Factory pattern in the .NET BCL
Observer pattern in the WPF
Composite pattern in the .NET Framework
Facade pattern in the .NET BCL
Iterator pattern in the .NET BCL
Summary
8
Concurrent and Parallel Programming under .NET
Concurrent and Parallel Programming under .NET
Days of Free Lunch
Days of Sponsored Lunch
Concurrent versus parallel
Some common patterns of parallel programming
Speculative execution
Summary
9
Functional Programming Techniques for Better State Management
Functional Programming Techniques for Better State Management
Being functional
Referential transparency
First-class and higher-order functions
Lambda (λ) calculus
Recursion
Sample programs
How does LINQ work?
Summary
10
Pattern Implementation Using Object/Functional Programming
Pattern Implementation Using Object/Functional Programming
A strategy pattern implementation using FP/OOP
A fresh look at the iterator pattern using FP/OOP
MapReduce programming idiom
A new spin on the template method pattern using FP/OOP
Summary
11
What is Reactive Programming?
What is Reactive Programming?
Being reactive
Electronic spread sheets - A quintessential example
Reactive programming model
Functional reactive programming
Rx from Microsoft
Converting entities to streams (IObservable<T>)
A philosophy for reactive programming
Summary
12
Reactive Programming Using .NET Rx Extensions
Reactive Programming Using .NET Rx Extensions
Streams as a way of life
Spell checker using events composition
MVVM on Rx
An asynchronous logger
Near real-time visualizer/dashboard
Summary
13
Reactive Programming Using RxJS
Reactive Programming Using RxJS
The JS world
Rx foundations
RxJS formalism
RxJS samples
Summary
14
A Road Ahead
A Road Ahead
Polyglot programming and design
Domain-specific languages
Ontology
AntiPatterns
Summary

About the Reviewers

Soumya Mukherjee is very passionate about working on open source projects and has extensive experience in architecting enterprise applications in .NET, JAVA, Ruby, and Python.

He has expertise in implementation of Test Driven and Behavioural Driven development and test automation for large teams. He has developed various tools, one of them is the Quantinuous Agile Framework (QAF) for continuous mobile and web automation.

He is a certified MCAD.NET, Certified Scrum Master (CSM), Certified Professional Selenium Agile Tester, a Trainer, and a seasoned author of couple of books on amazon. He is also a speaker across multiple world renowned conferences, an Agile Practitioner, and loves mentoring team's in Open Source Technologies.

He has extensive experience in Software Test Automation using professional tools, such as QTP, QC, LoadRunner, Jmeter, and Neoload GreenHat, and with Open Source Tools, such as Selenium RC & Web driver with Java, .Net, Python, Ruby, FitNess, JMeter, SoapUI, TestNG, ReportNG, JUnit, Cucumber & Capybara, and Tosca & Perfecto.

An ex-employee of JP Morgan, Merill Lynch, he is currently the co-founder of QAAgility Technologies and AppTestPro. He resides in Mumbai, India, with his wife, Garima.

Vidya Vrat Agarwal is passionate about .NET, a Microsoft MVP, a C# Corner MVP, a TOGAF certified architect, a Certified Scrum Master (CSM), an author, a speaker, a certified MCT, MCPD, MCTS, MCSD.NET, MCAD.NET, and MCSD. He is currently working as a .NET Enterprise Architect and Consultant in USA. He is passionate about .NET technology and loves to contribute to the .NET community. He blogs at http://www.MyPassionFor.NET and can be followed on Twitter, @DotNetAuthor. He lives with his wife, Rupali, and two daughters, Pearly and Arshika, in Redmond, WA.

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