Book Image

C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development - Fourth Edition

By : Mark J. Price
Book Image

C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development - Fourth Edition

By: Mark J. Price

Overview of this book

In C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development, Fourth 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 new chapters on Content Management Systems (CMS) and machine learning with ML.NET. The book covers all the topics you need. Part 1 teaches the fundamentals of C#, including object-oriented programming, and new C# 8.0 features such as nullable reference types, simplified switch pattern matching, and default interface methods. Part 2 covers the .NET Standard APIs, such as managing and querying data, monitoring and improving performance, working with the filesystem, async streams, serialization, and encryption. Part 3 provides examples of cross-platform applications you can build and deploy, such as web apps using ASP.NET Core or mobile apps using Xamarin.Forms. The book introduces three technologies for building Windows desktop applications including Windows Forms, Windows Presentation Foundation (WPF), and Universal Windows Platform (UWP) apps, as well as web applications, web services, and mobile apps.
Table of Contents (21 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 string 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()
    {
      WriteLine($"{Name...