Book Image

C# 9 and .NET 5 – Modern Cross-Platform Development - Fifth Edition

By : Mark J. Price
Book Image

C# 9 and .NET 5 – Modern Cross-Platform Development - Fifth Edition

By: Mark J. Price

Overview of this book

In C# 9 and .NET 5 – Modern Cross-Platform Development, Fifth Edition, expert teacher Mark J. Price gives you everything you need to start programming C# applications. This latest edition uses the popular Visual Studio Code editor to work across all major operating systems. It is fully updated and expanded with a new chapter on the Microsoft Blazor framework. The book’s first part teaches the fundamentals of C#, including object-oriented programming and new C# 9 features such as top-level programs, target-typed new object instantiation, and immutable types using the record keyword. Part 2 covers the .NET APIs, for performing tasks like managing and querying data, monitoring and improving performance, and working with the file system, async streams, serialization, and encryption. Part 3 provides examples of cross-platform apps you can build and deploy, such as websites and services using ASP.NET Core or mobile apps using Xamarin.Forms. The best type of application for learning the C# language constructs and many of the .NET libraries is one that does not distract with unnecessary application code. For that reason, the C# and .NET topics covered in Chapters 1 to 13 feature console applications. In Chapters 14 to 20, having mastered the basics of the language and libraries, you will build practical applications using ASP.NET Core, Model-View-Controller (MVC), and Blazor. By the end of the book, you will have acquired the understanding and skills you need to use C# 9 and .NET 5 to create websites, services, and mobile apps.
Table of Contents (23 chapters)

Pattern matching with objects

In Chapter 3, Controlling Flow and Converting Types, you were introduced to basic pattern matching. In this section, we will explore pattern matching in more detail.

Creating and referencing a .NET 5 class library

The enhanced pattern matching features are only available in .NET 5 class libraries that support C# 9 or later. First, we will see what pattern matching features were available before the enhancements in C# 9.

  1. Create a subfolder under Chapter05 named PacktLibrary9.
  2. In Visual Studio Code, navigate to File | Add Folder to Workspace…, select the PacktLibrary9 folder, and click Add.
  3. Navigate to Terminal | New Terminal and select PacktLibrary9.
  4. In TERMINAL, enter the following command: dotnet new classlib.
  5. In EXPLORER, in the PeopleApp folder, click on the file named PeopleApp.csproj.
  6. Add a language version element to force the use of the C# 8 compiler, and add a project reference to PacktLibrary9...