Design Patterns in C# (.NET)

The book "Design Patterns in C# (.NET)" is a practical guide to applying classic and modern design patterns in the .NET ecosystem. The material is aimed at developers who want to write more flexible, reusable, and maintainable code.

What this book is about

The author systematically covers 23 patterns from the GoF (Gang of Four) catalog, adapting them to the capabilities of the C# language and the .NET platform. Each pattern is examined using real-world tasks: from creating objects to organizing interaction between components.

• Creational patterns (Singleton, Factory Method, Abstract Factory, Builder, Prototype) — how to flexibly create objects without binding to specific classes.
• Structural patterns (Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy) — how to build convenient class hierarchies and manage relationships.
• Behavioral patterns (Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor) — how to organize object behavior and data exchange.

Who this book is for

The book will be useful for:

• Beginning C# developers who have already mastered the basics of the language and want to elevate the architecture of their projects;
• Experienced programmers who wish to systematize their knowledge and get acquainted with .NET-specific implementations of patterns;
• Students and instructors of software design courses on the Microsoft platform.

What you will learn

• How to correctly choose a pattern for a specific task, avoiding overkill;
• How patterns align with SOLID principles and modern approaches (DI, IoC, asynchrony);
• How to use built-in .NET features (LINQ, async/await, generics) to simplify implementation;
• Common mistakes and anti-patterns when introducing patterns into production code.

All examples are accompanied by UML class diagrams and C# code listings. At the end of each chapter, there are exercises to reinforce the material.

The book will become a reliable reference and desktop guide for any .NET developer striving to create high-quality software.