book

The C# Workshop

by Jason Hales, Almantas Karpavicius, Mateus Viegas

September 2022

Beginner

780 pages

14h 43m

English

Packt Publishing

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About the BookAudienceAbout the AuthorsAbout the ChaptersConventionsBlock of CodeEmphasisTechnical TermsAdded InformationTruncationBefore You BeginInstalling VS CodeMoving Between Chapters in VS CodeInstalling the .NET Developer PlatformThe .NET 6.0 Features Found in Windows, macOS, and LinuxWindowsmacOSLinuxDocker.NET Command-Line Interface (CLI)PostgreSQL Installation for WindowsPostgreSQL Installation for macOSExploring pgAdmin DashboardPostgreSQL Installation on UbuntuAccessing the postgres User Account with the postgres RoleVerifying the postgres User Account as a postgres User RoleAccessing a New User and DatabaseDownloading the Code
IntroductionRunning and Developing C# with the .NET CLICreating Programs with the CLI and VS CodeBasic Anatomy of a C# ProgramExercise 1.01: Creating a Console App that Says "Hello World"Top-Level StatementsDeclaring VariablesDeclaring Variables ExplicitlyDeclaring Variables ImplicitlyExplicit versus Implicit DeclarationExercise 1.02: Assigning Variables to User InputsData TypesStringsExercise 1.03: Checking String ImmutabilityComparing StringsNumeric TypesExercise 1.04: Using the Basic Arithmetic OperatorsClassesDatesExercise 1.05: Using Date ArithmeticFormatting DatesLogical Operators and Boolean ExpressionsUsing if-else StatementsExercise 1.06: Branching with if-elseThe Ternary OperatorReference and Value TypesExercise 1.07: Grasping Value and Reference Equality Default Value TypesEnhancing Decision Making with the switch StatementExercise 1.08: Using switch to Order FoodIteration StatementswhileExercise 1.09: Checking Whether a Number is Prime with a while LoopJump Statementsdo-whileArraysfor LoopsExercise 1.10: Ordering an Array Using Bubble Sortforeach StatementsFile HandlingFileAccessFileModeExercise 1.11: Reading Content from Text FilesDisposable ObjectsExercise 1.12: Writing to a Text FileExceptionsExercise 1.13: Handling Invalid User Inputs with try/catchActivity 1.01: Creating a Guessing GameSummary
IntroductionClasses and ObjectsConstructorsFields and Class MembersExercise 2.01: Creating Classes and ObjectsReference TypesPropertiesObject InitializationComparing Functions and MethodsAn Effective ClassExercise 2.02: Comparing the Area Occupied by Different ShapesThe Four Pillars of OOPEncapsulationInheritancePolymorphismWhat is the Benefit of Polymorphism?AbstractionInterfacesExercise 2.03: Covering Floor in the BackyardSOLID Principles in OOPSingle Responsibility PrincipleOpen-Closed PrincipleLiskov SubstitutionInterface SegregationDependency InversionHow C# Helps with Object-Oriented DesignStaticSealedPartialVirtualInternalConditional OperatorsTernary OperatorsOverloading OperatorsNullable Primitive TypesGenericsEnumExtension MethodsStructRecordInit-Only SettersValueTuple and DeconstructionExercise 2.04: Creating a Composable Temperature Unit ConverterActivity 2.01: Merging Two CirclesSummary
IntroductionDelegatesDefining a Custom DelegateExercise 3.01: Defining and Invoking Custom DelegatesThe Inbuilt Action and Func DelegatesAssigning DelegatesInvoking a DelegateExercise 3.02: Assigning and Invoking DelegatesMulticast DelegatesExercise 3.03: Invoking a Multicast DelegateMulticasting with a Func DelegateWhat Happens When Things Go Wrong?Exercise 3.04: Ensuring All Target Methods Are Invoked in a Multicast DelegateEventsDefining an EventExercise 3.05: Publishing and Subscribing to EventsEvents or Delegates?Static Events Can Cause Memory LeaksLambda ExpressionsExercise 3.06: Using a Statement Lambda to Reverse Words in a SentenceCaptures and ClosuresActivity 3.01: Creating a Web File DownloaderSummary
IntroductionData StructuresListsExercise 4.01: Maintaining Order within a ListQueuesStacksHashSetsDictionariesExercise 4.02: Using a Dictionary to Count the Words in a SentenceLINQQuery OperatorsQuery ExpressionsDeferred ExecutionStandard Query OperatorsProjection OperationsSelectAnonymous TypesSelectManyFiltering OperationsSorting OperationsOrderBy and OrderByDescendingThenBy and ThenByDescendingExercise 4.03: Filtering a List of Countries by Continent and Sorting by AreaPartitioning OperationsGrouping OperationsExercise 4.04: Finding the Most Commonly Used Words in a BookAggregation OperationsQuantifier OperationsJoin OperationsUsing a let Clause in Query ExpressionsActivity 4.01: Treasury Flight Data AnalysisSummary
IntroductionRunning Asynchronous Code Using TasksCreating a New TaskUsing Task.Factory.StartNewUsing Task.RunExercise 5.01: Using Tasks to Perform Multiple Slow-Running CalculationsCoordinating TasksWaiting for Tasks to CompleteExercise 5.02: Waiting for Multiple Tasks to Complete Within a Time PeriodContinuation TasksUsing Task.WhenAll and Task.WhenAny with Multiple TasksExercise 5.03: Waiting for All Tasks to CompleteAsynchronous ProgrammingAsync Lambda ExpressionsCanceling TasksExercise 5.04: Canceling Long-Running TasksException Handling in Async/Await CodeExercise 5.05: Handling Async ExceptionsThe AggregateException ClassIAsyncEnumerable StreamsParallel ProgrammingData ParallelismTask ParallelismThe Parallel ClassParallel.For and Parallel.ForEachActivity 5.01: Creating Images from a Fibonacci SequenceSummary
IntroductionCreating a Demo Database Before You StartModeling Databases Using EFConnection String and SecurityWhich One to Choose—EF or EF Core?ModelDbContext and DbSetAdventureWorks DatabaseExercise 6.01: Reading Stock Locations from AdventureWorks DatabaseQuerying a Database—LINQ to SQLQuery SyntaxThe Rest of CRUDExercise 6.02: Updating Products and Manufacturers TableDatabase FirstRevisiting DbContextGenerating DbContext from an Existing DatabaseCode First and MigrationsExercise 6.03: Managing Product Price ChangesPitfalls of EFExamples SetupMultiple AddsEquals over ==Using IEnumerable over IQueryableLazy over Eager LoadingRead-Only QueriesSummary of ResultsTools to Help You Spot Problems Early OnWorking with a Database in EnterpriseRepository PatternExercise 6.04: Creating a Generic RepositoryTesting Data Persistence Logic LocallyIn-Memory Database ProviderSQLite Database ProviderA Few Words on RepositoryQuery and Command Handlers PatternsSeparating the Database Model from the Business Logic (Domain) ModelActivity 6.01: Tracking System for Trucks DispatchedSummary
IntroductionAnatomy of an ASP.NET Web AppProgram.cs and the WebApplicationMiddlewaresLoggingDependency InjectionExercise 7.01: Creating Custom Logging MiddlewareDependency LifetimesRazor PagesBasic Razor SyntaxFile StructureExercise 7.02: Creating a Kanban Board with RazorPageModelThe Life Cycle with Page HandlersRendering Reusable Static Code with Tag HelpersExercise 7.03: Creating Reusable Components with Tag HelpersModel BindingExercise 7.04: Creating a New Page to Submit TasksValidationDynamic Behavior with Partial PagesExercise 7.05: Refactoring a Tag Helper to a Partial Page with Custom LogicActivity 7.01: Creating a Page to Edit an Existing TaskView ComponentsExercise 7.06: Creating a View Component to Display Task StatisticsActivity 7.02: Writing a View Component to Display Task LogSummary
IntroductionBrowserWeb APIRESTful APIPostmanClientOctokitAPI KeyAzure Text AnalyticsExercise 8.01: Performing Sentimental Text Analysis on Any TextYour Own ClientHttpClientHttpClient and IDisposableOAuthReal-life AnalogyAPI AnalogyOAuth App for GitHubAuthorization HeaderBasic AuthenticationAPI Key and Personal Access TokenThird-Party Authentication—OAuth2Request IdempotencyPUT, PATCH, or POSTExercise 8.02: HttpClient Calling a Star Wars Web APIActivity 8.01: Reusing HttpClient for the Rapid Creation of API ClientsRestSharpActivity 8.02: The Countries API Using RestSharp to List all CountriesRefitActivity 8.03: The Countries API Using Refit to List all CountriesOther Ways of Making HTTP RequestsExercise 8.03: A Strongly Typed HTTP Client for Testing Payments in a PayPal SandboxActivity 8.04: Using an Azure Blob Storage Client to Upload and Download FilesSummary

IntroductionASP.NET Core Web APICreating a New ProjectWeb API Project StructureAn In-Depth Look at WeatherForecastControllerResponding with Different Status CodesExercise 9.01: .NET Core Current Time ServiceBootstrapping a Web APIDependency InjectionProgram.cs and Minimal APIThe Inner Workings of the AddLogging MethodThe Lifetime of an Injected ComponentDI Examples within a ServiceSingletonScopedTransientTryAddManual Injection Using an IoC ContainerExercise 9.02: Displaying Current Time in a Country API Time ZoneOpenAPI and SwaggerUsing Swagger SwashbuckleError HandlingRequest ValidationConfigurationDevelopment Environments and ConfigurationBootstrappingCalling Another APIRapidAPIService ClientDTO and Mapping Using AutoMapperHttpClient DIExercise 9.03: Performing File Operations by Calling Azure Blob StorageSecuring a Web APIAzure Active DirectoryJWTOpenID ConnectApplication RegistrationImplementing Web API SecurityToken Generator AppConfiguring Swagger AuthTroubleshooting Token Validation ErrorsService-Oriented ArchitectureMicroservice ArchitectureActivity 9.01: Implementing the File Upload Service Using Microservice ArchitectureAzure FunctionsSummary

Overview

The C# Workshop is a hands-on guide designed to help you learn C# programming and apply it to solve real-world problems. With interactive exercises and projects, you'll build practical skills and understanding, tackling topics such as object-oriented programming, concurrency, and web application development. By the end, you'll be confidently crafting applications using C# and .NET.

What this Book will help me do

Gain proficiency in programming with C# 10 and .NET 6, building a strong foundation.
Understand object-oriented programming concepts and effectively apply them in your code.
Learn to handle database operations with C#, SQL, and Entity Framework.
Master web application development using ASP.NET and related technologies.
Acquire essential coding practices and utilize design principles in software development.

Author(s)

Jason Hales, Almantas Karpavicius, and Mateus Viegas are seasoned software developers and educators passionate about sharing their knowledge. With years of practical programming experience, they focus on creating engaging and clear educational content. Their collaborative approach ensures comprehensive guidance for aspiring C# developers.

Who is it for?

This book is tailored for aspiring C# developers aiming to enhance their programming skills and understanding. Prior knowledge of basic programming concepts will be helpful, and some experience with coding is advantageous but not mandatory. Perfect for those eager to dive into C# development and confidently tackle software projects.