Book Image

Parallel Programming and Concurrency with C# 10 and .NET 6

By : Alvin Ashcraft
Book Image

Parallel Programming and Concurrency with C# 10 and .NET 6

By: Alvin Ashcraft

Overview of this book

.NET has included managed threading capabilities since the beginning, but early techniques had inherent risks: memory leaks, thread synchronization issues, and deadlocks. This book will help you avoid those pitfalls and leverage the modern constructs available in .NET 6 and C# 10, while providing recommendations on patterns and best practices for parallelism and concurrency. Parallel, concurrent, and asynchronous programming are part of every .NET application today, and it becomes imperative for modern developers to understand how to effectively use these techniques. This book will teach intermediate-level .NET developers how to make their applications faster and more responsive with parallel programming and concurrency in .NET and C# with practical examples. The book starts with the essentials of multi-threaded .NET development and explores how the language and framework constructs have evolved along with .NET. You will later get to grips with the different options available today in .NET 6, followed by insights into best practices, debugging, and unit testing. By the end of this book, you will have a deep understanding of why, when, and how to employ parallelism and concurrency in any .NET application.
Table of Contents (18 chapters)
Part 1:Introduction to Threading in .NET
Part 2: Parallel Programming and Concurrency with C#
Part 3: Advanced Concurrency Concepts

Unit testing asynchronous code

Unit testing asynchronous code requires the same approach as writing good asynchronous C# code. If you need a refresher on how to work with async methods, you can review Chapter 5.

When writing a unit test for an async method, you will use the await keyword to wait for the method to complete. This requires that your unit test method is async and returns Task. Just like other C# code, creating async void methods is not permitted. Let’s look at a very simple test method:

private async Task GetBookAsync_Returns_A_Book()
    // Arrange
    BookService bookService = new();
    var bookId = 123;
    // Act
    var book = await bookService.GetBookAsync(bookId);
    // Assert
    Assert.Equal(bookId, book.Id);

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