Book Image

Improving your C# Skills

By : Ovais Mehboob Ahmed Khan, John Callaway, Clayton Hunt, Rod Stephens
Book Image

Improving your C# Skills

By: Ovais Mehboob Ahmed Khan, John Callaway, Clayton Hunt, Rod Stephens

Overview of this book

This Learning Path shows you how to create high performing applications and solve programming challenges using a wide range of C# features. You’ll begin by learning how to identify the bottlenecks in writing programs, highlight common performance pitfalls, and apply strategies to detect and resolve these issues early. You'll also study the importance of micro-services architecture for building fast applications and implementing resiliency and security in .NET Core. Then, you'll study the importance of defining and testing boundaries, abstracting away third-party code, and working with different types of test double, such as spies, mocks, and fakes. In addition to describing programming trade-offs, this Learning Path will also help you build a useful toolkit of techniques, including value caching, statistical analysis, and geometric algorithms. This Learning Path includes content from the following Packt products: • C# 7 and .NET Core 2.0 High Performance by Ovais Mehboob Ahmed Khan • Practical Test-Driven Development using C# 7 by John Callaway, Clayton Hunt • The Modern C# Challenge by Rod Stephens

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Improving your C# Skills
Ovais Mehboob Ahmed Khan | John Callaway | Clayton Hunt | Rod Stephens
Feb, 2019 | 10 hours 6 minutes
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Table of Contents (26 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
About Packt
About Packt
Contributors
Contributors
Preface
Preface
Free Chapter
1
What's New in .NET Core 2 and C# 7?
What's New in .NET Core 2 and C# 7?
Evolution of .NET
New improvements in .NET Core 2.0
Upgrading path from .NET Core 1.x to 2.0
Exploring .NET Core CLI and New Project Templates
Understanding .NET Standard
Creating a .NET Standard library
What comes with ASP.NET Core 2.0
New features in C# 7.0
Writing quality code
Summary
2
Understanding .NET Core Internals and Measuring Performance
Understanding .NET Core Internals and Measuring Performance
.NET Core internals
Utilizing multiple cores of the CPU for high performance
How releasing builds increases performance
Benchmarking .NET Core 2.0 applications
Summary
3
Multithreading and Asynchronous Programming in .NET Core
Multithreading and Asynchronous Programming in .NET Core
Multithreading versus asynchronous programming
Multithreading in .NET Core
Summary
4
Securing and Implementing Resilience in .NET Core Applications
Securing and Implementing Resilience in .NET Core Applications
Introduction to resilient applications
Storing sensitive information using Application Secrets
Protecting ASP.NET Core APIs
Summary
5
Why TDD is Important
Why TDD is Important
First, a little background
So, what is TDD?
An approach to TDD 
Arguments against TDD
Arguments in favor of TDD
Different types of test
Why does it matter?
Summary
6
Setting Up the .NET Test Environment
Setting Up the .NET Test Environment
Installing the .NET Core SDK
Creating a project in VS Code
Switching to xUnit
What is Speaker Meet?
Summary
7
Setting Up a JavaScript Environment
Setting Up a JavaScript Environment
Node.js
A quick introduction to JavaScript IDEs
Summary
8
What to Know Before Getting Started
What to Know Before Getting Started
Untestable code
Summary
9
Tabula Rasa – Approaching an Application with TDD in Mind
Tabula Rasa – Approaching an Application with TDD in Mind
Where to begin
Yak shaving
A clean slate
Test small
Devil's advocate
Test negative cases first
When testing is painful
Breaking down Speaker Meet
Summary
10
Testing JavaScript Applications
Testing JavaScript Applications
Creating a React app
The plan
Speaker listing
Speaker detail
Summary
11
Exploring Integrations
Exploring Integrations
Implementing a real API service
End-to-end integration tests
Configuring the API project
Summary
12
Changes in Requirements
Changes in Requirements
Hello World
FizzBuzz
TODO app  
Changes to Speaker Meet
What now?
Summary
13
The Legacy Problem
The Legacy Problem
What is legacy code?
Typical issues resulting from legacy code
Issues that prevent adding tests 
Dealing with legacy problems
Moving forward 
Summary
14
Unraveling a Mess
Unraveling a Mess
Inheriting code
Life sometimes hands you lemons
Summary
15
Geometry
Geometry
Problems
Solutions
Summary
16
Randomization
Randomization
Problems
Solutions
Summary
17
Files and Directories
Files and Directories
Problems
Solutions
Summary
18
Advanced C# and .NET Features
Advanced C# and .NET Features
Problems
Solutions
Summary
19
Cryptography
Cryptography
Problems
Solutions
Summary
Other Books You May Enjoy
Other Books You May Enjoy
Leave a review - let other readers know what you think
Index
Index

TODO app  

The TODO app was another one of our early TDD examples. This app is far from complete, and we have received new requirements from the business, asking to add a feature to the application.

The business now wants the ability to complete a task in the TODO list. This feature is schedule current sprint and is the next story for us to work on.

Mark complete

For the Mark complete story, we have been asked to allow the user to complete any of the tasks in the TODO list. Adding this feature should be much like any other TDD exercise in this book. Before reading our solution to this problem, try to complete this one on your own. After you have passing tests, come back and look at the solution in this book.

Adding tests

In the ToDoApplicationTests file, we have added a yak shaving test to force us to create the complete method. This test also helps to define the API for the method:

[Fact(Skip = "Yak shaving - no longer needed")]
public void CompleteTodoExists()
{
  // Arrange
  var todo = new...
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