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)

Working with types and attributes

Reflection is a programming feature that allows code to understand and manipulate itself. An assembly is made up of up to four parts:

  • Assembly metadata and manifest: Name, assembly, and file version, referenced assemblies, and so on.
  • Type metadata: Information about the types, their members, and so on.
  • IL code: Implementation of methods, properties, constructors, and so on.
  • Embedded resources (optional): Images, strings, JavaScript, and so on.

The metadata comprises items of information about your code. The metadata is generated automatically from your code (for example, information about the types and members) or applied to your code using attributes.

Attributes can be applied at multiple levels: to assemblies, to types, and to their members, as shown in the following code:

// an assembly-level attribute
[assembly: AssemblyTitle("Working with Reflection")] 
// a type-level attribute