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)

Inheriting from classes

The Person type we created earlier implicitly derived (inherited) from System.Object. Now, we will create a class that inherits from Person:

  1. Add a new class named Employee to the PacktLibrary project.
  2. Modify its statements, as shown in the following code:
    using System; 
    namespace Packt.Shared 
      public class Employee : Person 
  3. Add statements to the Main method to create an instance of the Employee class, as shown in the following code:
    Employee john = new Employee 
      Name = "John Jones", 
      DateOfBirth = new DateTime(1990, 7, 28) 
  4. Run the console application and view the result, as shown in the following output:
    John Jones was born on a Saturday

Note that the Employee class has inherited all the members of Person.

Extending classes to add functionality

Now, we will add some employee-specific members to extend the...