You're reading from An Atypical ASP.NET Core 6 Design Patterns Guide A SOLID adventure into architectural principles and design patterns using .NET 6 and C# 10

Product type Paperback

Published in Mar 2022

Publisher Packt

ISBN-13 9781803249841

Length 678 pages

Edition 2nd Edition

Languages

Tools

.NET

Concepts

Design Patterns

Author (1):

Carl-Hugo Marcotte

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Table of Contents (31) Chapters

Preface

1. Section 1: Principles and Methodologies

2. Introduction FREE CHAPTER

3. Automated Testing

4. Architectural Principles

5. Section 2: Designing for ASP.NET Core

6. The MVC Pattern Using Razor

7. The MVC Pattern for Web APIs

8. Understanding the Strategy, Abstract Factory, and Singleton Design Patterns

9. Deep Dive into Dependency Injection

10. Options and Logging Patterns

11. Section 3: Designing at Component Scale

12. Structural Patterns

13. Behavioral Patterns

14. Understanding the Operation Result Design Pattern

15. Section 4: Designing at Application Scale

16. Understanding Layering

17. Getting Started with Object Mappers

18. Mediator and CQRS Design Patterns

19. Getting Started with Vertical Slice Architecture

20. Introduction to Microservices Architecture

21. Section 5: Designing the Client Side

22. ASP.NET Core User Interfaces

23. A Brief Look into Blazor

24. Assessment Answers

25. Acronyms Lexicon

26. Other Books You May Enjoy

27. Index

Appendices

1. Appendix A

2. Appendix B

Revisiting the Singleton pattern

The Singleton pattern is obsolete, goes against the SOLID principles, and we replace it with a lifetime, as we’ve already seen. This section explores that lifetime and recreates the good old application state, which turns out to be nothing more than a singleton scoped dictionary.

We explore two examples here: one about the application state, in case you were wondering where that feature disappeared to. Then, the Wishlist project also uses the singleton lifetime to provide an application-level feature. There are also a few unit tests to play with the testability and to allow safe refactoring.

Project – Application state

You might remember the application state if you programmed ASP.NET using .NET Framework or the “good” old classic ASP with VBScript. If you don’t, the application state was a key/value dictionary that allowed you to store data globally in your application, shared between all sessions and...