Architecting ASP.NET Core Applications: An atypical design patterns guide for .NET 8, C# 12, and beyond

Backend design like you've never seen it before – a guide to building SOLID ASP.NET Core web apps that stand the test of time. Featuring more Minimal APIs, more testing, a new e-commerce project, and the modular monolith!

Purchase of the print or Kindle book includes a free PDF eBook.

Key Features

• Learn multiple ways to organize your application code and become a more flexible ASP.NET Core developer
• Explore hands-on design patterns, learn architectural principles, and how to sidestep anti-patterns
• Refactor code toward modern application design, such as feature-based vertical slice and clean architecture

Book Description

This unique ASP.NET Core book will fill in the gaps in your REST API and backend designs. Learn how to build robust, maintainable, and flexible apps using Gang of Four (GoF) design patterns and modern architectural principles. This new edition is updated for .NET 8 and focuses exclusively on the backend, with new content on REST APIs, the REPR pattern, and building modular monoliths.

You’ll start by covering foundational concepts like REST, the SOLID principles, Minimal APIs, dependency injection in .NET, and other ASP.NET Core 8 mechanisms. Then, you’ll learn to develop components using design patterns, including many from the GoF. Finally, you’ll explore organizing your application code with patterns that vary from layers to feature-oriented vertical slice designs, covering CQS and a deep dive into microservices along the way. A brand-new e-commerce project at the end of the book will tie it all together.

This how-to guide will teach you how to assemble your own APIs from building blocks, to suit whatever real-world requirements you may have.

What you will learn

• Apply the SOLID principles for building flexible and maintainable software
• Test your apps effectively with automated tests, including black-box testing
• Embark on mastering ASP.NET Core dependency injection
• Work with GoF design patterns including strategy, decorator, facade, and composite
• Design REST APIs using Minimal APIs and ASP.NET Core MVC
• Discover layering and the tenets of clean architecture
• Use feature-oriented techniques as an alternative to layering
• Explore microservices, CQS, REPR, vertical slice architecture, and many more patterns

Who this book is for

This book is for intermediate-level ASP.NET Core developers who want to improve their C# app code structure and API design skills. ASP.NET developers who want to modernize their knowledge and enhance their technical architecture skills will also like this book. It’s also a good refresher for those in software design roles with more experience looking to update their expertise.

A good knowledge of C# programming and a basic understanding of web concepts is necessary to get the most out of this book, though some refreshers are included along the way.

Table of Contents

1. Introduction
2. Automated Testing
3. Architectural Principles
4. REST APIs
5. Minimal APIs
6. Model-View-Controller
7. Strategy, Abstract Factory, and Singleton Design Patterns
8. Dependency Injection
9. Application Configuration and the Options Pattern
10. Logging Patterns
11. Structural Patterns
12. Behavioral Patterns
13. Operation Result Pattern
14. Layering and Clean Architecture
15. Object Mappers
16. Mediator and CQS Patterns
17. Getting Started with Vertical Slice Architecture
18. Request-EndPoint-Response (REPR)
19. Introduction to Microservices Architecture
20. Modular Monolith

Carl-Hugo Marcotte is a software craftsman who has developed digital products professionally since 2005, while his coding journey started around 1989 for fun. He has a bachelor's degree in computer science. He has acquired a solid background in software architecture and expertise in ASP.NET Core through creating a wide range of web and cloud applications, from custom e-commerce websites to enterprise applications. He served many customers as an independent consultant, taught programming, and is now a Principal Architect at Export Development Canada. Passionate about C#, ASP.NET Core, AI, automation, and Cloud computing, he fosters collaboration and the open-source ethos, sharing his expertise with the tech community.