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)

Making types safely reusable with generics

In 2005, with C# 2.0 and .NET Framework 2.0, Microsoft introduced a feature named generics, which enables your types to be more safely reusable and more efficient. It does this by allowing a programmer to pass types as parameters, similar to how you can pass objects as parameters.

First, let's look at an example of a non-generic type, so that you can understand the problem that generics is designed to solve.

  1. In the PacktLibrary project, add a new class named Thing, as shown in the following code, and note the following:
    • Thing has an object field named Data.
    • Thing has a method named Process that accepts an object input parameter and returns a string value.
    using System;
    namespace Packt.Shared
    {
      public class Thing
      {
        public object Data = default(object);
        public string Process(object input)
        {
          if (Data == input)
          {
            return "Data and input are the same.";
          }
          else
          {
        ...