book

An Atypical ASP.NET Core 6 Design Patterns Guide - Second Edition

by Carl-Hugo Marcotte

March 2022

Intermediate to advanced

678 pages

17h 12m

English

Packt Publishing

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What is a design pattern?Anti-patterns and code smellsAnti-patternsAnti-pattern – God ClassCode smellsCode smell – Control FreakCode smell – Long MethodsUnderstanding the web – request/responseGetting started with .NET.NET SDK versus runtime.NET 5+ versus .NET StandardVisual Studio Code versus Visual Studio versus the command-line interface An overview of project templatesRunning and building your programTechnical requirementsSummaryQuestionsFurther reading
An overview of automated testingUnit testingIntegration testingEnd-to-end testingOther types of testsPicking the right test styleTesting approachesRefactoringTechnical debtTesting .NET applicationsCreating an xUnit test projectGetting started with xUnitFactsAssertionsTheoriesClosing wordsArrange, Act, AssertOrganizing your testsUnit testsIntegration testsASP.NET Core integration testingClassic web applicationMinimal hostingImportant testing principlesSummaryQuestionsFurther reading
The SOLID principlesSingle responsibility principle (SRP)Project – BookStoreWhat is an interface?Open/Closed principle (OCP)Project – IAttackerLiskov substitution principle (LSP)Project – HallOfFameConclusionInterface segregation principle (ISP)Project – Ninja versus PirateProject – Bookstore updateConclusionDependency inversion principle (DIP)Direct dependencyInverted dependencyInverting subsystems using DIPProject – Dependency inversionConclusionWhat’s next?Other important principlesSeparation of concernsDon’t repeat yourself (DRY)Keep it simple, stupid (KISS)SummaryQuestionsFurther reading
The Model View Controller design patternGoalDesignAnatomy of ASP.NET Core MVCDirectory structureControllerModelViewDefault routingConclusionThe View Model design patternGoalDesignProject – View models (a list of students)ConclusionSummaryQuestionsFurther reading
An overview of RESTHTTP methodsStatus codeHTTP headersVersioningDefault versioning strategyVersioning strategyWrapping upThe Model View Controller design patternGoalDesignAnatomy of ASP.NET Core web APIsThe entry pointDirectory structureControllerReturning valuesAttribute routingConclusionThe Data Transfer Object design patternGoalDesignProject – DTOConclusionAPI contractsSummaryQuestionsFurther reading
The Strategy design patternGoalDesignProject – StrategyConclusionThe Abstract Factory design patternGoalDesignProject – AbstractVehicleFactoryConclusionThe Singleton design patternGoalDesignAn alternate (better) wayCode smell – Ambient ContextConclusionSummaryQuestions
What is dependency injection?The composition rootRegistering your features elegantlyObject lifetimeCode smell – Control FreakUsing external IoC containersRevisiting the Strategy patternConstructor injectionProperty injectionMethod injectionProject – StrategyAdding the View ModelAdding a guard clauseConclusionRevisiting the Singleton patternProject – Application stateProject – WishlistConclusionUnderstanding the Service Locator patternProject – ServiceLocatorImplementing method injectionImplementing constructor injectionImplementing a minimal APIConclusionRevisiting the Factory patternProject – FactoryConclusionSummaryQuestionsFurther reading

The Options patternGetting startedIOptionsMonitor<TOptions>IOptionsFactory<TOptions>IOptionsSnapshot<TOptions>IOptions<TOptions>Project – CommonScenariosNamed optionsUsing settingsProject – OptionsConfigurationImplementing a configurator objectUsing multiple configurator objectsExploring other configuration possibilitiesProject – OptionsValidationEager validationData annotationsValidation typesProject – OptionsValidationFluentValidationWorkaround – Injecting options directlyConclusionBecoming familiar with .NET logging abstractionsAbout loggingWriting logsLog levelsLogging providersConfiguring loggingStructured loggingConclusionSummaryQuestionsFurther reading
Implementing the Decorator design patternGoalDesignProject – Adding behaviorsDecoratorADecoratorBProject – Decorator using ScrutorConclusionImplementing the Composite design patternGoalDesignProject – BookStoreConclusionImplementing the Adapter design patternGoalDesignProject – GreeterConclusionImplementing the Façade design patternGoalDesignProject – The façadesOpaque façadeTransparent façadeThe programFlexibility in actionAlternative façade patternsConclusionSummaryQuestionsFurther reading
Implementing the Template Method patternGoalDesignProject – Building a search machineConclusionImplementing the Chain of Responsibility patternGoalDesignProject – Message interpreterProject – Improved message interpreterProject – A final, finer-grained designConclusionSummaryQuestions
The Operation Result patternGoalDesignProject – Implementing different Operation Result patternsThe consumerThe simplest form of the Operation Result patternA single error messageAdding a return valueMultiple error messagesAdding message severitySub-classes and factoriesAdvantages and disadvantagesAdvantagesDisadvantagesSummaryQuestionsFurther reading
Introducing layeringClassic layering modelSplitting the layersLayers versus tiers versus assembliesWhat is an assembly?Responsibilities of the common layersPresentationDomainRich domain modelAnemic domain modelService layerDataRepository patternUnit of Work patternAbstract layersSharing the modelClean ArchitectureImplementing layering in real lifeTo be or not to be a purist?Building a façade over a database SummaryQuestionsFurther reading
Object mapperGoalDesignProject – MapperCode smell – Too many dependenciesPattern – Aggregate ServicesPattern – Mapping FaçadeProject – Mapping serviceProject – AutoMapperConclusionSummaryQuestionsFurther reading
A high-level overview of Vertical Slice ArchitectureImplementing the Mediator patternGoalDesignProject – Mediator (IMediator)Project – Mediator (IChatRoom)ConclusionImplementing the CQRS patternGoalDesignProject – CQRSCode smell – Marker InterfacesMetadataDependency identifierConclusionUsing MediatR as a mediatorProject – Clean Architecture with MediatRConclusionSummaryQuestionsFurther reading
Vertical Slice ArchitectureWhat are the advantages and disadvantages?Anti-pattern – Big Ball of MudProject – Vertical Slice ArchitectureProject organizationExploring a featureRequest validationTestingContinuing your journeyConclusionSummaryQuestionsFurther reading
What are microservices?Cohesive unit of businessOwnership of dataMicroservice independenceAn introduction to event-driven architectureDomain eventsIntegration eventsApplication eventsEnterprise eventsConclusionGetting started with message queuesConclusionImplementing the Publish-Subscribe patternMessage brokersThe event sourcing patternExampleConclusionIntroducing Gateway patternsGateway Routing patternGateway Aggregation patternBackends for Frontends patternMixing and matching gatewaysConclusionRevisiting the CQRS patternConclusionExploring the Microservice Adapter patternAdapting an existing system to anotherDecommissioning a legacy applicationAdapting an event broker to anotherConclusionSummaryQuestionsFurther reading
Getting familiar with Razor PagesDesignRoutingConclusionOrganizing the user interfacePartial viewsProject – Shared formConclusionTag HelpersBuilt-in Tag HelpersCreating a custom Tag HelperCreating an RSS feed TagHelperComponentConclusionView componentsProject – Reusable employee countConclusionDisplay and editor templatesDisplay templatesEditor templatesProject – Composite BookStore revisitedConclusionSummaryQuestionsFurther reading
Overview of Blazor ServerOverview of Blazor WebAssemblyGetting familiar with Razor componentsCreating Razor componentsC#-only componentsRazor-only componentsRazor and C# hybrid componentsCSS isolationComponent life cycleEvent handlingThe Model-View-Update patternGoalDesignProject – CounterConclusionA medley of Blazor featuresSummaryQuestionsFurther readingAn end is simply a new beginning
Older C# featuresThe null-coalescing operator (C# 2.0)Expression-bodied member (C# 6-7)Throw expressions (C# 7.0)Tuples (C# 7.0+)Default literal expressions (C# 7.1)Switch expressions (C# 8)Discards (C# 7)Async main (C# 7.1)User-defined conversion operators (C# 1)Local functions (C# 7) and a static local function (C# 8)What’s new in .NET 5 and C# 9?Top-level statementsTarget-typed new expressionsInit-only propertiesRecord classesSimplifying the record creationThe with keywordDeconstructionEquality comparisonConclusionWhat’s new in .NET 6 and C# 10?File-scoped namespacesGlobal using directivesImplicit using directivesConstant interpolated stringsRecord structMinimal hosting modelMinimal APIsNullable reference types
An overview of containersDockerDocker ComposeOrchestrationProject TyeKubernetesScalingSummaryFurther reading
Chapter 1Chapter 2Chapter 3Chapter 4Chapter 5Chapter 6Chapter 7Chapter 8Chapter 9Chapter 10Chapter 11Chapter 12Chapter 13Chapter 14Chapter 15Chapter 16Chapter 17Chapter 18

Overview

Delve into the enthralling world of advanced software development with "An Atypical ASP.NET Core 6 Design Patterns Guide." This book expertly explores SOLID architectural principles, ASP.NET Core 6 mechanisms, and a host of software design patterns. Through practical examples and structured topics, you'll master combining and applying patterns in dynamic ways to build scalable applications.

What this Book will help me do

Master the application of SOLID principles for crafting flexible and maintainable software.
Enhance understanding of dependency injection in .NET programming.
Learn to utilize GoF design patterns such as strategy, decorator, and composite.
Explore the MVC pattern for building web APIs and applications in ASP.NET Core.
Gain insight into implementing modern application architectures like CQRS and microservices.

Author(s)

Carl-Hugo Marcotte, a distinguished software expert and practitioner, channels his extensive experience in ASP.NET and design patterns into this insightful guide. With years of practical development expertise, Carl-Hugo focuses on blending architectural concepts with practical solutions. Through his writing, he empowers developers to construct robust and scalable applications.

Who is it for?

If you are a software or web developer with an intermediate grasp of .NET and want to create scalable web applications, this book is for you. Whether you're enhancing your knowledge of design patterns or seeking to build robust solutions, this guide will provide the tools and insights you need. Familiarity with C# and basic web concepts is recommended.

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An Atypical ASP.NET Core 5 Design Patterns Guide

Publisher Resources

ISBN: 9781803249841Supplemental Content

An Atypical ASP.NET Core 6 Design Patterns Guide - Second Edition

by Carl-Hugo Marcotte

Overview

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.

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Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,and much more.

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Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.