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An Atypical ASP.NET Core 5 Design Patterns Guide
An Atypical ASP.NET Core 5 Design Patterns Guide

An Atypical ASP.NET Core 5 Design Patterns Guide: A SOLID adventure into architectural principles, design patterns, .NET 5, and C#

By Carl-Hugo Marcotte
$35.99 $24.99
Book Dec 2020 762 pages 1st Edition
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An Atypical ASP.NET Core 5 Design Patterns Guide

Chapter 1: Introduction to .NET

The goal behind this book is not to create yet another design pattern book, but instead, it organizes the chapters cohesively based on scale and topics, allowing you to start small with strong bases and build slowly on top, in just the same way that you would build a program.

Instead of writing a guide that covers a few ways of applying a design pattern, we explore the thinking process behind the systems that we are designing from a software engineer's point of view.

This is not a magic recipe book, and from experience, there is no magic recipe when designing software; there is only your logic, knowledge, experience, and analytical skills. From that last sentence, let's define experience according to 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 covered...

What is a design pattern?

Since you just purchased a book about design patterns, I guess that you have some idea of what they are, but let's just make sure that we are on the same page:

Abstract definition: A design pattern is a proven technique that can be used to solve a specific problem.

In this book, we apply different patterns to solve different problems and how to leverage some open source tools to go further, faster! Abstract definitions make people sound intelligent and all, but 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 at the end of the book to correlate the multiple practical examples and explanations with that definition, making it clear enough.

I like to compare programming to playing with LEGO® because what you must do is mostly the same: snap small pieces together to create something...

Anti-patterns and code smells

Anti-patterns and code smells are architectural bad practices or tips about possible bad design. Learning about best practices is as important as learning about bad ones, which is where we start. Moreover, there are multiple anti-patterns and code smells throughout the book to help you get started.

Unfortunately, we can't cover every detail of every topic, so I encourage you to dig deeper into those fields as well as into design patterns and architectural principles.

Anti-patterns

An anti-pattern is the opposite of a design pattern: it is a proven flawed technique that will most likely cause you some trouble and cost you time and money (and probably give you a headache or two along the way).

A priori, an anti-pattern is a pattern that seems to be a good idea, and that seems to be the solution that you were looking for, but in the end, it will most likely cause more harm than good. Some anti-patterns started out as legitimate design patterns...

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 most likely does something (executes some 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 not aware that it responded to a request earlier for that same client...

Getting started with .NET

A bit of history; the team did a magnificent job building ASP.NET Core from the ground up, cutting out compatibility with older versions. That brought its share of problems at first, but those interoperability issues got alleviated by the creation of .NET Standards. Now, with the reunification of most technologies into .NET 5 and the promise of a shared BCL, the name ASP.NET Core is (almost) no more, but became the future. Afterward, Microsoft is planning a major release of .NET every year, so 2021 should be .NET 6, and so on.

The good thing is that architectural principles and design patterns should remain relevant in the future and are not tightly coupled with the versions of .NET you are using. Minor changes to the code sample should be enough to migrate the knowledge and the code to the new versions.

Now, let's cover some key information surrounding .NET 5 and the .NET ecosystem.

.NET SDK versus runtime

You can install different binaries...

Summary

In this chapter, we peaked at design patterns, anti-patterns, and code smells. We also explored a few of those. We then moved to a reminder about the request/response cycle of a typical web application.

We continued by exploring .NET essentials, such as SDK versus runtime and app target versus .NET Standard. This sets us on the path to exploring the different possibilities that we have when it comes to building our .NET applications. 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.

In the next two chapters, we explore automated testing and architectural principles. These are foundational chapters for anyone wishing to build 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:

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Key benefits

  • Apply software design patterns effectively, starting small and progressing to cloud-scale
  • Discover modern application architectures such as vertical slice, clean architecture, and event-driven microservices
  • Explore ASP.NET design patterns, from options to full-stack web development using Blazor

Description

Design patterns are a set of solutions to many of the common problems occurring in software development. Knowledge of these design patterns helps developers and professionals to craft software solutions of any scale. ASP.NET Core 5 Design Patterns starts by exploring basic design patterns, architectural principles, dependency injection, and other ASP.NET Core mechanisms. You’ll explore the component scale as you discover patterns oriented toward small chunks of the software, and then move to application-scale patterns and techniques to understand higher-level patterns and how to structure the application as a whole. The book covers a range of significant GoF (Gangs of Four) design patterns such as strategy, singleton, decorator, facade, and composite. The chapters are organized based on scale and topics, allowing you to start small and build on a strong base, the same way that you would develop a program. With the help of use cases, the book will show you how to combine design patterns to display alternate usage and help you feel comfortable working with a variety of design patterns. Finally, you’ll advance to the client side to connect the dots and make ASP.NET Core a viable full-stack alternative. By the end of the book, you’ll be able to mix and match design patterns and have learned how to think about architecture and how it works.

What you will learn

Apply the SOLID principles for building flexible and maintainable software Get to grips with .NET 5 dependency injection Work with GoF design patterns such as strategy, decorator, and composite Explore the MVC patterns for designing web APIs and web applications using Razor Discover layering techniques and tenets of clean architecture Become familiar with CQRS and vertical slice architecture as an alternative to layering Understand microservices, what they are, and what they are not Build ASP.NET UI from server-side to client-side Blazor

Product Details

Country selected

Publication date : Dec 31, 2020
Length 762 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781789346091
Vendor :
Microsoft
Category :
Languages :

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
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Product Details


Publication date : Dec 31, 2020
Length 762 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781789346091
Vendor :
Microsoft
Category :
Languages :

Table of Contents

27 Chapters
Preface Chevron down icon Chevron up icon
1. Section 1: Principles and Methodologies Chevron down icon Chevron up icon
2. Chapter 1: Introduction to .NET Chevron down icon Chevron up icon
3. Chapter 2: Testing Your ASP.NET Core Application Chevron down icon Chevron up icon
4. Chapter 3: Architectural Principles Chevron down icon Chevron up icon
5. Section 2: Designing for ASP.NET Core Chevron down icon Chevron up icon
6. Chapter 4: The MVC Pattern using Razor Chevron down icon Chevron up icon
7. Chapter 5: The MVC Pattern for Web APIs Chevron down icon Chevron up icon
8. Chapter 6: Understanding the Strategy, Abstract Factory, and Singleton Design Patterns Chevron down icon Chevron up icon
9. Chapter 7: Deep Dive into Dependency Injection Chevron down icon Chevron up icon
10. Chapter 8: Options and Logging Patterns Chevron down icon Chevron up icon
11. Section 3: Designing at Component Scale Chevron down icon Chevron up icon
12. Chapter 9: Structural Patterns Chevron down icon Chevron up icon
13. Chapter 10: Behavioral Patterns Chevron down icon Chevron up icon
14. Chapter 11: Understanding the Operation Result Design Pattern Chevron down icon Chevron up icon
15. Section 4: Designing at Application Scale Chevron down icon Chevron up icon
16. Chapter 12: Understanding Layering Chevron down icon Chevron up icon
17. Chapter 13: Getting Started with Object Mappers Chevron down icon Chevron up icon
18. Chapter 14: Mediator and CQRS Design Patterns Chevron down icon Chevron up icon
19. Chapter 15: Getting Started with Vertical Slice Architecture Chevron down icon Chevron up icon
20. Chapter 16: Introduction to Microservices Architecture Chevron down icon Chevron up icon
21. Section 5: Designing the Client Side Chevron down icon Chevron up icon
22. Chapter 17: ASP.NET Core User Interfaces Chevron down icon Chevron up icon
23. Chapter 18: A Brief Look into Blazor Chevron down icon Chevron up icon
24. Assessment Answers Chevron down icon Chevron up icon
25. Acronyms Lexicon Chevron down icon Chevron up icon
26. Other Books You May Enjoy Chevron down icon Chevron up icon

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