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)

Understanding selection statements

Every application needs to be able to select from choices and branch along different code paths. The two selection statements in C# are if and switch. You can use if for all your code, but switch can simplify your code in some common scenarios such as when there is a single variable that can have multiple values that each require different processing.

Branching with the if statement

The if statement determines which branch to follow by evaluating a Boolean expression. If the expression is true, then the block executes. The else block is optional, and it executes if the if expression is false. The if statement can be nested.

The if statement combined with other if statements as else if branches, as shown in the following code:

if (expression1)
{
  // runs if expression1 is true
}
else if (expression2)
{
  // runs if expression1 is false and expression2 if true
}
else if (expression3)
{
  // runs if expression1 and expression2 are false...