book

Code like a Pro in C#

Name: Code like a Pro in C#
Author: Jort Rodenburg
ISBN: 9781617298028

by Jort Rodenburg

July 2021

Intermediate to advanced

416 pages

11h 53m

English

Manning Publications

Audiobook available

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inside front cover
Clean Code Checklist
Code like a Pro in C#
Copyright
contents
front matter
prefaceacknowledgmentsabout this bookWho should read this bookHow this book is organized: A roadmapAbout the codeliveBook discussion forumabout the authorabout the cover illustration
Part 1 Using C# and .NET
1 Introducing C# and .NET
1.1 Why work in C#?1.1.1 Reason 1: C# is economical1.1.2 Reason 2: C# is maintainable1.1.3 Reason 3: C# is developer friendly and easy to use1.2 Why not work in C#?1.2.1 Operating system development1.2.2 Real-time operating system embedded development in C#1.2.3 Numerical computing and C#1.3 Switching to C#1.4 What you will learn in this book1.5 What you will not learn in this bookSummary
2 .NET and how it compiles
2.1 What is the .NET Framework?2.2 What is .NET 5?Exercises2.3 How CLI-compliant languages are compiled2.3.1 Step 1: C# code (high-level)2.3.2 Step 2: Common Intermediate Language (assembly level)2.3.3 Step 3: Native code (processor level)ExercisesSummary
Part 2 The existing codebase
3 How bad is this code?
3.1 Introducing Flying Dutchman Airlines3.2 Pieces of the puzzle: Taking a look at our requirements3.2.1 Object-relational mapping3.2.2 The GET /flight endpoint: Retrieving information on all flights3.2.3 The GET /flight/{flightNumber} endpoint: Getting specific flight information3.2.4 The POST /booking/{flightNumber} endpoint: Booking a flight3.3 Coming to terms with the existing codebase3.3.1 Assessing the existing database schema and its tables3.3.2 The existing codebase: Web service configuration files3.3.3 Considering models and views in the existing codebaseSummary

4 Manage your unmanaged resources!
4.1 The FlightController: Assessing the GET /flight endpoint4.1.1 The GET /flight endpoint and what it does4.1.2 Method signature: The meaning of ResponseType and typeof4.1.3 Collecting flight information with collections4.1.4 Connection strings, or how to give a security engineer a heart attack4.1.5 Using IDisposable to release unmanaged resources4.1.6 Querying a database with SqlCommand4.2 The FlightController: Assessing GET /flight/{flightNumber}4.3 The FlightController: POST /flight4.4 The FlightController: DELETE /flight/{flightNumber}ExercisesSummary
Part 3 The database access layer
5 Setting up a project and database with Entity Framework Core
5.1 Creating a .NET 5 solution and project5.2 Setting up and configuring a web service5.2.1 Configuring a .NET 5 web service5.2.2 Creating and using HostBuilder5.2.3 Implementing the Startup class5.2.4 Using the repository/service pattern for our web service architecture5.3 Implementing the database access layer5.3.1 Entity Framework Core and reverse-engineering5.3.2 DbSet and the Entity Framework Core workflow5.3.3 Configuration methods and environment variables5.3.4 Setting an environment variable on Windows5.3.5 Setting an environment variable on macOS5.3.6 Retrieving environment variables at run time in your codeExercisesSummary
Part 4 The repository layer
6 Test-driven development and dependency injection
6.1 Test-driven developmentExercises6.2 The CreateCustomer method6.2.1 Why you should always validate input arguments6.2.2 Using “arrange, act, assert” to write unit tests6.2.3 Validating against invalid characters6.2.4 In-lining test data with the [DataRow] attribute6.2.5 Object initializers and autogenerated code6.2.6 Constructors, reflection, and asynchronous programming6.2.7 Locks, mutexes, and semaphores6.2.8 Synchronous to asynchronous execution . . . continued6.2.9 Testing Entity Framework Core6.2.10 Controlling dependencies with dependency injectionExercisesSummary
7 Comparing objects
7.1 The GetCustomerByName method7.1.1 Question marks: Nullable types and their applications7.1.2 Custom exceptions, LINQ, and extension methods7.2 Congruence: From the Middle Ages to C#7.2.1 Creating a “comparer” class using EqualityComparer<T>7.2.2 Testing equality by overriding the Equals method7.2.3 Overloading the equality operatorExercisesSummary
8 Stubbing, generics, and coupling
8.1 Implementing the Booking repository8.2 Input validation, separation of concerns, and couplingExercises8.3 Using object initializers8.4 Unit testing with stubs8.5 Programming with generics8.6 Providing default arguments by using optional parameters8.7 Conditionals, Func, switches, and switch expressions8.7.1 The ternary conditional operator8.7.2 Branching using an array of functions8.7.3 Switch statements and expressions8.7.4 Querying for pending changes in Entity Framework CoreExercisesSummary
9 Extension methods, streams, and abstract classes
9.1 Implementing the Airport repository9.2 Getting an Airport out of the database by its ID9.3 Validating the AirportID input parameter9.4 Output streams and being specifically abstract9.5 Querying the database for an Airport object9.6 Implementing the Flight repository9.6.1 The IsPositive extension method and “magic numbers”9.6.2 Getting a flight out of the databaseExercisesSummary
Part 5 The service layer
10 Reflection and mocks
10.1 The repository/service pattern revisited10.1.1 What is the use of a service class?Exercises10.2 Implementing the CustomerService10.2.1 Setting up for success: Creating skeleton classes10.2.2 How to delete your own codeExercises10.3 Implementing the BookingService10.3.1 Unit testing across architectural layers10.3.2 The difference between a stub and a mock10.3.3 Mocking a class with the Moq library10.3.4 Calling a repository from a serviceExercisesSummary
11 Runtime type checking revisited and error handling
11.1 Validating input parameters of a service layer method11.1.1 Runtime type checks with the is and as operators11.1.2 Type checking with the is operator11.1.3 Type checking with the as operator11.1.4 What did we do in section 11.1?11.2 Cleaning up the BookingServiceTests class11.3 Foreign key constraints in service classes11.3.1 Calling the Flight repository from a service classExercisesSummary
12 Using IAsyncEnumerable<T> and yield return
12.1 Do we need an AirportService class?12.2 Implementing the FlightService class12.2.1 Getting information on a specific flight from the FlightRepository12.2.2 Combining two data streams into a view12.2.3 Using the yield return keywords with try-catch code blocks12.2.4 Implementing GetFlightByFlightNumberExercisesSummary
Part 6 The controller layer
13 Middleware, HTTP routing, and HTTP responses
13.1 The controller class within the repository/service pattern13.2 Determining what controllers to implement13.3 Implementing the FlightController13.3.1 Returning HTTP responses with the IActionResult interface (GetFlights)13.3.2 Injecting dependencies into a controller using middleware13.3.3 Implementing the GET /Flight/{FlightNumber} endpoint13.4 Routing HTTP requests to controllers and methodsExercisesSummary
14 JSON serialization/ deserialization and custom model binding
14.1 Implementing the BookingController class14.1.1 Introduction to data deserialization14.1.2 Using the [FromBody] attribute to deserialize incoming HTTP data14.1.3 Using a custom model binder and method attribute for model binding14.1.4 Implementing the CreateBooking endpoint method logic14.2 Acceptance testing and Swagger middleware14.2.1 Manual acceptance testing with an OpenAPI specification14.2.2 Generating an OpenAPI specification at runtime14.3 The end of the roadSummary
appendix A Exercise answers
Chapter 2: .NET and how it compilesChapter 4: Manage your unmanaged resources!Chapter 5: Setting up a project and database with Entity Framework CoreChapter 6: Test-driven development and dependency injectionChapter 7: Comparing objectsChapter 8: Stubbing, generics, and couplingChapter 9: Extension methods, streams, and abstract classesChapter 10: Reflection and mocksChapter 11: Runtime type checking revisited and error handlingChapter 12: Using IAsyncEnumerable<T> and yield returnChapter 13: Middleware, HTTP routing, and HTTP responses
appendix B Clean code checklist
appendix C Installation guides
appendix D OpenAPI FlyTomorrow
appendix E Reading list
index
inside back cover
Clean Code Checklist

Content preview from Code like a Pro in C#

3 How bad is this code?

This chapter covers

HTTP routes, resources, and endpoints
Auto-properties and init-only setters
Configuring an ASP.NET service

In this chapter, we’ll meet Flying Dutchman Airlines, who have hired us to refactor their legacy codebase. Flying Dutchman has told us their business needs and given us their requirements for the refactor. Their legacy application, which we’ll examine in this (and the next) chapter, is a backend web service developed on the .NET Framework following the Model-View-Controller (MVC) pattern. The code has many readability and security issues, so don’t be surprised if there are pieces of code in this chapter that you don’t like. The point of this chapter is for us to determine where we can change ...

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Code like a Pro in C#

by Jort Rodenburg

3 How bad is this code?

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