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)

Managing the filesystem

Your applications will often need to perform input and output with files and directories in different environments. The System and System.IO namespaces contain classes for this purpose.

Handling cross-platform environments and filesystems

Let's explore how to handle cross-platform environments like the differences between Windows and Linux or macOS:

  1. Create a new console application named WorkingWithFileSystems in a folder named Chapter09.
  2. Save the workspace as Chapter09 and add WorkingWithFileSystems to it.
  3. Import the System.IO namespace, and statically import the System.Console, System.IO.Directory, System.Environment, and System.IO.Path types, as shown in the following code:
    using System.IO; // types for managing the filesystem
    using static System.Console;
    using static System.IO.Directory;
    using static System.IO.Path;
    using static System.Environment;

    Paths are different for Windows, macOS, and Linux, so...