An Atypical ASP.NET Core 5 Design Patterns Guide [1 ed.] 9781789346091

Table of contents :
Cover
Title Page
Copyright and Credits
Dedicated
About Packt
Foreword
Contributors
Table of Contents
Preface
Section 1: Principles and Methodologies
Chapter 1: Introduction to .NET
What is a design pattern?
Anti-patterns and code smells
Anti-patterns
Code smells
Understanding the web – Request/Response
Getting started with .NET
.NET SDK versus runtime
.NET 5 versus .NET Standard
Visual Studio Code versus Visual Studio versus the command-line interface (CLI)
Technical requirements
Summary
Questions
Further reading
Chapter 2: Testing Your ASP.NET Core Application
Overview of automated testing and how it applies to ASP.NET Core
Test-driven development (TDD)
Testing made easy through ASP.NET Core
How do you create an xUnit test project?
Basic features of xUnit
How to organize your tests
How is it easier?
Summary
Questions
Further reading
Chapter 3: Architectural Principles
The SOLID principles
Single responsibility principle (SRP)
Open/Closed principle (OCP)
Liskov substitution principle (LSP)
Interface segregation principle (ISP)
Dependency inversion principle (DIP)
Other important principles
Separation of concerns
Don't repeat yourself (DRY)
Summary
Questions
Section 2: Designing for ASP.NET Core
Chapter 4: The MVC Pattern using Razor
The Model View Controller design pattern
MVC using Razor
Directory structure
Structure of a controller
Default routing
Project: MVC
Conclusion
View Model design pattern
Goal
Design
Project: View models (a list of students)
Project: View models (a student form)
Conclusion
Summary
Questions
Further reading
Chapter 5: The MVC Pattern for Web APIs
An overview of REST
Request HTTP methods
Response status code
Anatomy of a web API
Setting up a web API
Attribute routing
Returning values
C# features
Class conversion operators (C#)
Local functions (C# 7) and a static local function (C# 8)
The Data Transfer Object design pattern
Goal
Design
Project – DTO
API contracts
Analyzing the DTO sample
Project – OpenAPI
Project – API contracts
Idea – Creating a typed client library
One last observation
Summary
Questions
Further reading
Chapter 6: Understanding the Strategy, Abstract Factory, and Singleton Design Patterns
The Strategy design pattern
Goal
Design
Project: Strategy
Conclusion
A brief look at a few C# features
Default literal expressions (C# 7.1)
Switch expressions (C# 8)
Discards (C# 7)
The Abstract Factory design pattern
Goal
Design
Project: AbstractVehicleFactory
Project: MiddleEndVehicleFactory
Conclusion
The Singleton design pattern
Goal
Design
An alternate (better) way
Code smell: Ambient Context
Conclusion
Summary
Questions
Chapter 7: Deep Dive into Dependency Injection
What is Dependency Injection?
The composition root
Extending IServiceCollection
Object lifetime
Code smell: Control Freak
Using external IoC containers
Revisiting the Strategy pattern
Constructor injection
Property injection
Method injection
Project: Strategy
Revisiting the Singleton pattern
The application state
Project: Wishlist
Tuples (C# 7+)
Understanding the Service Locator pattern
Project: ServiceLocator
Project: ServiceLocatorFixed
Conclusion
Revisiting the Factory pattern
Factory mixed with method injection
HomeViewModelFactory
Summary
Questions
Further reading
Chapter 8: Options and Logging Patterns
An overview of the Options pattern
Getting started
Project – CommonScenarios
Project – OptionsConfiguration
Project – OptionsValidation
Injecting options directly
Conclusion
Getting familiar with .NET logging abstractions
About logging
Writing logs
Log levels
Logging providers
Configuring logging
Conclusion
Summary
Questions
Further reading
Section 3: Designing at Component Scale
Chapter 9: Structural Patterns
Implementing the Decorator design pattern
Goal
Design
Project: Adding behaviors
Project: Decorator using Scrutor
Conclusion
Implementing the Composite design pattern
Goal
Design
Project: BookStore
Conclusion
Implementing the Adapter design pattern
Goal
Design
Project: Greeter
Conclusion
Implementing the Façade design pattern
Goal
Design
Project: The façades
Conclusion
Summary
Questions
Further reading
Chapter 10: Behavioral Patterns
Implementing the Template Method pattern
Goal
Design
Project – Building a search machine
Conclusion
Implementing the Chain of Responsibility pattern
Goal
Project – Message interpreter
Project – Improved message interpreter
Project – A final, finer-grained design
Conclusion
Summary
Questions
Chapter 11: Understanding the Operation Result Design Pattern
Goal
Design
Project – Implementing different Operation Result patterns
The consumer
Its simplest form
A single error message
Adding a return value
Multiple error messages
Adding message severity
Sub-classes and factories
Advantages and disadvantages
Advantages
Disadvantages
Summary
Questions
Further reading
Section 4: Designing at Application Scale
Chapter 12: Understanding Layering
Introduction to layering
Splitting the layers
Layers versus tiers versus assemblies
To be or not to be a purist?
Sharing the model
The reality of small- to medium-sized enterprises
Responsibilities of the common layers
Presentation
Domain
Data
Abstract data layer
Shared rich model
Clean Architecture
Summary
Questions
Further reading
Chapter 13: Getting Started with Object Mappers
Overview of object mapping
Goal
Design
Project: Mapper
Code smell: Too many dependencies
Pattern – Aggregate Services
Pattern – Mapping Façade
Project – Mapping service
Project – AutoMapper
Summary
Questions
Further reading
Chapter 14: Mediator and CQRS Design Patterns
A high-level overview of Vertical Slice Architecture
Implementing the Mediator pattern
Goal
Design
Project – Mediator (IMediator)
Project – Mediator (IChatRoom)
Conclusion
Implementing the CQRS pattern
Goal
Design
Project: CQRS
Code smell – marker interfaces
Conclusion
Using MediatR as a mediator
Project – Clean Architecture with MediatR
Conclusion
Summary
Questions
Further reading
Chapter 15: Getting Started with Vertical Slice Architecture
Vertical Slice Architecture
What are the advantages and disadvantages?
Anti-pattern: Big Ball of Mud
Project: Vertical Slice Architecture
Continuing your journey
Summary
Questions
Further reading
Chapter 16: Introduction to Microservices Architecture
What are microservices?
Cohesive unit of business
Own its data
Independence
Getting started with message queues
Conclusion
An overview of events
Domain events
Integration events
Implementing the Publish-Subscribe pattern
Message brokers
The event sourcing pattern
Example
Conclusion
Introducing Gateway patterns
Gateway Routing pattern
Gateway Aggregation pattern
Backends for Frontends pattern
Mixing and matching gateways
Conclusion
Revisiting the CQRS pattern
Conclusion
An overview of containers
Docker
Docker Compose
Orchestration
Scaling
Conclusion
Summary
Questions
Further reading
Section 5: Designing the Client Side
Chapter 17: ASP.NET Core User Interfaces
Getting familiar with Razor Pages
Design
Routing
Conclusion
Organizing the user interface
Partial views
Tag Helpers
View components
C# 9 features
Top-level statements (C# 9)
Target-typed new expressions (C# 9)
Init-only properties (C# 9)
Record classes (C# 9)
Conclusion
Display and Editor Templates
Display Templates
Editor Templates
Project : Composite BookStore revisited
Conclusion
Summary
Questions
Further reading
Chapter 18: A Brief Look into Blazor
An overview of Blazor Server
Overview of Blazor WebAssembly
Getting familiar with Razor components
Creating Razor components
CSS isolation
Component life cycle
Event handling
The Model-View-Update pattern
Goal
Design
Project: Counter
Conclusion
A medley of Blazor features
Summary
Questions
Further reading
An end is simply a new beginning
Assessment Answers
Acronyms Lexicon
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