Book Image

An Atypical ASP.NET Core 5 Design Patterns Guide

By : Carl-Hugo Marcotte
Book Image

An Atypical ASP.NET Core 5 Design Patterns Guide

By: Carl-Hugo Marcotte

Overview of this book

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.
Table of Contents (27 chapters)
1
Section 1: Principles and Methodologies
5
Section 2: Designing for ASP.NET Core
11
Section 3: Designing at Component Scale
15
Section 4: Designing at Application Scale
21
Section 5: Designing the Client Side
25
Acronyms Lexicon

Chapter 14: Mediator and CQRS Design Patterns

In this chapter, we explore the building blocks that we will use in the next chapter about Vertical Slice Architecture. We begin with a quick overview of Vertical Slice Architecture to give you an idea of the end goal to understand where we are heading. Then we explore the Mediator design pattern, which plays the role of the middleman between the components of our application. That leads us to the Command Query Responsibility Segregation (CQRS) pattern, which describes how to organize our logic. Finally, to piece all of that together, we explore MediatR, an open source implementation of the Mediator design pattern.

The following topics will be covered in this chapter:

  • A high-level overview of Vertical Slice Architecture
  • Implementing the Mediator pattern
  • Implementing the CQRS pattern
  • Using MediatR as a mediator

Let's begin with the end goal.