Get hands-on experience with each Gang of Four (GoF) design pattern using C#. For each of the patterns, you will see at least one real-world scenario, a coding example, and a complete implementation including output. In addition to GoF patterns, you will learn additional design patterns which are common and equally important.

In this second edition, you will go through the design patterns and their implementation in Visual Studio 2019 and C# 8. Common patterns in asynchronous programming are covered, including the TAP pattern and APM pattern. You will learn via easy-to-follow examples and understand the concepts in depth. With these updated patterns, you will have a collection of programs to port over to your own projects.

The book begins with the 23 GoF design patterns, and then moves onto alternative design patterns, including the Simple Factory, Null Object, and MVC patterns plus various patterns in asynchronous programming. The book concludes with a discussion of the criticisms of design patterns and chapters on anti-patterns.

Each chapter includes a Q&A session that clears up any doubts and covers the pros and cons of each pattern. FAQs will help you consolidate your knowledge.

You will:

• Work with each of the design patterns
• Implement the design patterns in real-world applications
• Select an alternative to these patterns by comparing their pros and cons
• Use Visual Studio Community Edition 2019 to write code and generate output

Table of Contents

Part I: Gang of Four Design Patterns

Part I.A: Creational Patterns

Chapter 1: Singleton Pattern

Chapter 2: Prototype Pattern

Chapter 3: Builder Pattern

Chapter 4: Factory Method Pattern

Chapter 5: Abstract Factory Pattern

Part I.B: Structural Patterns

Chapter 6: Proxy Pattern

Chapter 7: Decorator Pattern

Chapter 8: Adapter Pattern

Chapter 9: Facade Pattern

Chapter 10: Flyweight Pattern

Chapter 11: Composite Pattern

Chapter 12: Bridge Pattern

Part I.C: Behavioral Patterns

Chapter 13: Visitor Pattern

Chapter 14: Observer Pattern

Chapter 15: Strategy Pattern

Chapter 16: Template Method Pattern

Chapter 17: Command Pattern

Chapter 18: Ite rator Pattern

Chapter 19: Memento Pattern

Chapter 20: State Pattern

Chapter 21: Mediator Pattern

Chapter 22: Chain of Responsibility Pattern

Chapter 23: Inte rpreter Pattern

Part II: Additional Design Patterns

Chapter 24: Simple Factory Pattern

Chapter 25: Null Object Pattern

Chapter 26: MVC Pattern

Chapter 27: Patterns in Asynchronous Programming

Part Ill: Final Thoughts on Design Patterns

Chapter 28: Criticisms of Design Patterns

Chapter 29: AntiPatterns

Chapter 30: FAQ

Appendix A: A Brief Overview of GoF Design Patterns

Appendix B: Useful Resources

Appendix C: The Road Ahead

Appendix D: Important Updates in the Second Edition

About the Author

Vaskaran Sarcar obtained his Master of Engineering in software engineering from Jadavpur University, Kolkata (India) and an MCA from Vidyasagar University, Midnapore (India). He was a National Gate Scholar (2007-2009) and has more than 12 years of experience in Education and the IT industry. Vaskaran devoted his early years (2005-2007) in teaching at various engineering colleges, and later he joined HP India PPS R&D Hub Bangalore .He worked there until August, 2019. At the time of his retirement from the IT industry, he was a Senior Software Engineer and Team Lead at HP. To follow his dream and passion, Vaskaran is now an independent full-time author. Other books by him include: • Getting Started with Advanced C# (Apress,2020) • Interactive Object-Oriented Programming in Java Second Edition (Apress,2019) • Java Design Patterns Second Edition (Apress,2019) • Design Patterns in C# (Apress,2018) • Interactive C# (Apress,2017) • Interactive Object-Oriented Programming in Java(Apress,2016) • Java Design Patterns(Apress,2016) • C# Basics: Test Your Skills(Createspace,2015) • Operating System: Computer Science Interview Series(Createspace,2014)