Book Image

Hands-On Parallel Programming with C# 8 and .NET Core 3

By : Shakti Tanwar
Book Image

Hands-On Parallel Programming with C# 8 and .NET Core 3

By: Shakti Tanwar

Overview of this book

In today’s world, every CPU has a multi-core processor. However, unless your application has implemented parallel programming, it will fail to utilize the hardware’s full processing capacity. This book will show you how to write modern software on the optimized and high-performing .NET Core 3 framework using C# 8. Hands-On Parallel Programming with C# 8 and .NET Core 3 covers how to build multithreaded, concurrent, and optimized applications that harness the power of multi-core processors. Once you’ve understood the fundamentals of threading and concurrency, you’ll gain insights into the data structure in .NET Core that supports parallelism. The book will then help you perform asynchronous programming in C# and diagnose and debug parallel code effectively. You’ll also get to grips with the new Kestrel server and understand the difference between the IIS and Kestrel operating models. Finally, you’ll learn best practices such as test-driven development, and run unit tests on your parallel code. By the end of the book, you’ll have developed a deep understanding of the core concepts of concurrency and asynchrony to create responsive applications that are not CPU-intensive.
Table of Contents (22 chapters)
Free Chapter
Section 1: Fundamentals of Threading, Multitasking, and Asynchrony
Section 2: Data Structures that Support Parallelism in .NET Core
Section 3: Asynchronous Programming Using C#
Section 4: Debugging, Diagnostics, and Unit Testing for Async Code
Section 5: Parallel Programming Feature Additions to .NET Core

Mocking the setup for async code using Moq

Mocking objects is a very important aspect of unit testing. As you may be aware, unit testing is about testing one module at a time; any external dependency is assumed to be working fine.

There are many mocking frameworks available for .NET, including the following:

  • NSubstitute (not supported in .NET core)
  • Rhino Mocks (not supported in .NET core)
  • Moq (supported in .NET core)
  • NMock3 (not supported in .NET core)

For the sake of demonstration, we will be using Moq to mock our serviced components.

In this section, we will create a simple service containing asynchronous methods. Then, we will try to write unit test cases for the methods that call the service. Let's consider a service interface:

public interface IService
Task<string> GetDataAsync();

As we can see, the interface has a GetDataAsync() method, which fetches data...