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)

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 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
public class Person
  // a member-level attribute 
  [Obsolete("Deprecated: use Run instead.&quot...