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Architecting ASP.NET Core Applications
Architecting ASP.NET Core Applications

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

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Architecting ASP.NET Core Applications

Introduction

This book organizes chapters according to scale and topic, which allows you to start with a solid foundation and gradually build upon it, much like constructing a program. We aim to delve into the thought processes behind the systems we design from a software engineer’s perspective.

While many resources focus on presenting just a handful of ways to apply design patterns, this book diverges from that path. We emphasize understanding the underlying principles and the rationale behind architectural choices hands-on.

This is not a magic recipe book. From experience, there is no magical recipe when designing software, only your logic, knowledge, experience, and analytical skills. Let’s define “experience” as your past successes and failures. And don’t worry, you will fail during your career, but don’t get discouraged by it. The faster you fail, the faster you can recover and learn, leading to successful products. Many techniques...

Before you begin: Join our book community on Discord

Give your feedback straight to the author himself and chat to other early readers on our Discord server (find the "architecting-aspnet-core-apps-3e" channel under EARLY ACCESS SUBSCRIPTION).

https://packt.link/EarlyAccess

Qr code Description automatically generated

The goal of this book is not to create yet another design pattern book; instead, the chapters are organized according to scale and topic, allowing you to start small with a solid foundation and build slowly upon it, just like you would build a program.Instead of a guide covering a few ways of applying a design pattern, we will explore the thought processes behind the systems we are designing from a software engineer’s point of view.This is not a magic recipe book; from experience, there is no magical recipe when designing software; there are only your logic, knowledge, experience, and analytical skills. Let’s define “experience” as your past successes and failures. And don’...

What is a design pattern?

Since you just purchased a book about design patterns, I guess you have some idea of what design patterns are, but let’s make sure that we are on the same page.Abstract definition: A design pattern is a proven technique that we can use to solve a specific problem.In this book, we apply different patterns to solve various problems and leverage some open-source tools to go further, faster! Abstract definitions make people sound smart, but understanding concepts requires more practice, and there is no better way to learn than by experimenting with something, and design patterns are no different.If that definition does not make sense to you yet, don’t worry. You should have enough information by the end of the book to correlate the multiple practical examples and explanations with that definition, making it crystal clear.I like to compare programming to playing with LEGO® because what you have to do is very similar: put small pieces together to...

Anti-patterns and code smells

Anti-patterns and code smells are bad architectural practices or tips about possible bad design. Learning about best practices is as important as learning about bad ones, which is where we start. The book highlights multiple anti-patterns and code smells to help you get started. Next, we briefly explore the first few.

Anti-patterns

An anti-pattern is the opposite of a design pattern: it is a proven flawed technique that will most likely cause you trouble and cost you time and money (and probably give you headaches).An anti-pattern is a pattern that seems a good idea and seems to be the solution you were looking for, but it causes more harm than good. Some anti-patterns started as legitimate design patterns and were labelled anti-patterns later. Sometimes, it is a matter of opinion, and sometimes the classification can be influenced by the programming language or technologies.Let’s look at an example next. We will explore some other anti-patterns throughout...

Understanding the web – request/response

Before going any further, it is imperative to understand the basic concept of the web. The idea behind HTTP 1.X is that a client sends an HTTP request to a server, and then the server responds to that client. That can sound trivial if you have web development experience. However, it is one of the most important web programming concepts, irrespective of whether you are building web APIs, websites, or complex cloud applications.Let’s reduce an HTTP request lifetime to the following:

  1. The communication starts.
  2. The client sends a request to the server.
  3. The server receives the request.
  4. The server does something with the request, like executing code/logic.
  5. The server responds to the client.
  6. The communication ends.

After that cycle, the server is no longer aware of the client. Moreover, if the client sends another request, the server is unaware that it responded to a request earlier for that same client because HTTP is stateless.There are...

1 Introduction

Before you begin: Join our book community on Discord

Give your feedback straight to the author himself and chat to other early readers on our Discord server (find the "architecting-aspnet-core-apps-3e" channel under EARLY ACCESS SUBSCRIPTION).

https://packt.link/EarlyAccess

Qr code Description automatically generated

The goal of this book is not to create yet another design pattern book; instead, the chapters are organized according to scale and topic, allowing you to start small with a solid foundation and build slowly upon it, just like you would build a program.Instead of a guide covering a few ways of applying a design pattern, we will explore the thought processes behind the systems we are designing from a software engineer’s point of view.This is not a magic recipe book; from experience, there is no magical recipe when designing software; there are only your logic, knowledge, experience, and analytical skills. Let’s define “experience” as your past successes and failures...

Summary

This chapter looked at design patterns, anti-patterns, and code smells. We also explored a few of them. We then moved on to a recap of a typical web application’s request/response cycle.We continued by exploring .NET essentials, such as SDK versus runtime and app targets versus .NET Standard. We then dug a little more into the .NET CLI, where I laid down a list of essential commands, including dotnet build and dotnet watch run. We also covered how to create new projects. This has set us up to explore the different possibilities we have when building our .NET applications.In the next two chapters, we explore automated testing and architectural principles. These are foundational chapters for building robust, flexible, and maintainable applications.

Questions

Let’s take a look at a few practice questions:

  1. Can we add a body to a GET request?
  2. Why are long methods a code smell?
  3. Is it true that .NET Standard should be your default target when creating libraries?
  4. What is a code smell?

Further reading

Here are some links to consolidate what has been learned in the chapter:

Left arrow icon Right arrow icon
Download code icon Download Code

Key benefits

  • 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

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.

Who is this book 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.

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
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Publication date : Mar 22, 2024
Length: 806 pages
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Language : English
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Table of Contents

26 Chapters
Section 1: Principles and Methodologies Chevron down icon Chevron up icon
Introduction Chevron down icon Chevron up icon
Automated Testing Chevron down icon Chevron up icon
Architectural Principles Chevron down icon Chevron up icon
REST APIs Chevron down icon Chevron up icon
Section 2: Designing with ASP.NET Core Chevron down icon Chevron up icon
Minimal APIs Chevron down icon Chevron up icon
Model-View-Controller Chevron down icon Chevron up icon
Strategy, Abstract Factory, and Singleton Design Patterns Chevron down icon Chevron up icon
Dependency Injection Chevron down icon Chevron up icon
Application Configuration and the Options Pattern Chevron down icon Chevron up icon
Logging Patterns Chevron down icon Chevron up icon
Section 3: Component Patterns Chevron down icon Chevron up icon
Structural Patterns Chevron down icon Chevron up icon
Behavioral Patterns Chevron down icon Chevron up icon
Operation Result Pattern Chevron down icon Chevron up icon
Section 4: Application Patterns Chevron down icon Chevron up icon
Layering and Clean Architecture Chevron down icon Chevron up icon
Object Mappers Chevron down icon Chevron up icon
Mediator and CQS Patterns Chevron down icon Chevron up icon
Getting Started with Vertical Slice Architecture Chevron down icon Chevron up icon
Request-EndPoint-Response (REPR) Chevron down icon Chevron up icon
Introduction to Microservices Architecture Chevron down icon Chevron up icon
Modular Monolith Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Full star icon Half star icon 4.5
(11 Ratings)
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Andriy Apr 27, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
One of the best books on asp.net api architecture. Really worth the time. Great job!
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Giuseppe Nov 09, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book!
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carlos javier bazan huaman Aug 09, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Para un developer que tiene años trabajando este libro te da buenas ideas y bases para continuar con tu carrera, tiene muchos puntos utiles que un buen develper debe saber.
Feefo Verified review Feefo
Jorge Apr 02, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am enjoying a lot this book; I would say that it should be required reading for any backend .NET developer at intermediate and advanced levels.I found lots of very good material to learn, re-learn, unlearn, covering (in addition to the traditional GoF design patterns) the newest .NET 8 C#/ASP.NET API specific implementations of minimal APIs, microservices, vertical slicing, automated testing, etc.There are many other very good Architecture and Design Patterns books out there in general (ie: 'Clean Architecture') or specifically for the .NET platform (ie: 'Adaptive Code', 'Code that Fits in your Head') and others, but this book rounds up many essential and the latest concepts and presents them in a very comprehensive and appealing manner.The book focuses on the API/backend. It doesn't cover frontend .NET technologies like Blazor or MAUI; but perhaps it doesn't need to, there are many other books for those topics; it would have been nice, though, to maybe had covered couple of them (MVU, MVVM, etc.).I find the book a very interesting refresher, I'm still going through it and for me it's filling lots of gaps, gray areas and covering new ideas and design approaches.My specific approach is that I'm going through the concepts and examples step-by-step even if I feel I know the material.
Amazon Verified review Amazon
Jonathan Reeves Apr 08, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book was a great addition to my collection. I will say if you are a beginner in ASP.NET Core or are coming from another language or framework this book might be a little bit confusing. If you have been using C# and .NET for a few years or built a few apps with the language and framework then you should have no trouble with understanding the concepts taught in this book.The book is not a beginner's guide to ASP.NET Core but rather a book on the common design patterns implemented while using the framework. The author has done a great job on explaining the dos and don'ts of the framework and how you can follow in the footsteps of others to ensure a sound and secure application is built following the principles and patterns discussed.If you are looking to increase your architecting skills with ASP.NET Core and C# then this book will help guide you on that journey.
Amazon Verified review Amazon
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