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)

Writing and calling methods

Methods are members of a type that execute a block of statements.

Returning values from methods

Methods can return a single value or return nothing.

  • A method that performs some actions but does not return a value indicates this with the void type before the name of the method.
  • A method that performs some actions and returns a value indicates this with the type of the return value before the name of the method.

For example, you will create two methods:

  • WriteToConsole: This will perform an action (writing some text to the console), but it will return nothing from the method, indicated by the void keyword.
  • GetOrigin: This will return a text value, indicated by the string keyword.

Let's write the code:

  1. Inside the Person class, statically import System.Console.
  2. Add statements to define the two methods, as shown in the following code:
    // methods
    public void WriteToConsole...