Refactoring C# (.NET) Code: A Practical Guide

The book "Refactoring C# (.NET) Code" is a practical guide for developers who want to turn "working" code into clean, maintainable, and performant code. Unlike abstract theories, the author offers specific techniques and examples from real-world practice on the .NET platform.

What is this book about?

You will learn:

• Identify code smells — duplication, long methods, convoluted conditions, improper memory and thread management.
• Apply classic refactorings (extract method, replace inheritance with delegation, encapsulate fields) taking into account the specifics of C# 8–12 and .NET 6–8.
• Use modern tools — Roslyn analyzers, ReSharper, built-in capabilities of Visual Studio and Rider.
• Improve architecture — from a monolithic class to clean architecture, implementing Dependency Injection, working with async/await and LINQ without sacrificing performance.
• Safely refactor legacy code — strategies for test coverage, layer separation, gradually eliminating God objects.

Who is this book for?

• Junior and Middle developers who write in C# and want to elevate their code quality to the next level.
• Senior engineers looking to systematize their knowledge and implement refactoring processes within their team.
• Tech leads and architects seeking practical methods to combat technical debt.

What will you learn?

• How to distinguish necessary refactoring from premature optimization.
• How to refactor tests along with code without losing quality.
• How to work with inheritance, interfaces, and generics without pain.
• How to apply patterns (Strategy, Visitor, Decorator) in real-world scenarios.
• How to measure code "cleanliness" with metrics and automate checks in CI/CD.

Each chapter contains code before and after refactoring, explanations, and exercises for reinforcement. The book is written in a lively style, without excessive academicism — only what will be useful at work tomorrow.

Ideal for those who want to stop being afraid of touching someone else's code and learn how to make it better with their own hands.