Book Image

C# 7.1 and .NET Core 2.0 ??? Modern Cross-Platform Development - Third Edition

By : Mark J. Price
Book Image

C# 7.1 and .NET Core 2.0 ??? Modern Cross-Platform Development - Third Edition

By: Mark J. Price

Overview of this book

C# 7.1 and .NET Core 2.0 – Modern Cross-Platform Development, Third Edition, is a practical guide to creating powerful cross-platform applications with C# 7.1 and .NET Core 2.0. It gives readers of any experience level a solid foundation in C# and .NET. The first part of the book runs you through the basics of C#, as well as debugging functions and object-oriented programming, before taking a quick tour through the latest features of C# 7.1 such as default literals, tuples, inferred tuple names, pattern matching, out variables, and more. After quickly taking you through C# and how .NET works, this book dives into the .NET Standard 2.0 class libraries, covering topics such as packaging and deploying your own libraries, and using common libraries for working with collections, performance, monitoring, serialization, files, databases, and encryption. The final section of the book demonstrates the major types of application that you can build and deploy cross-device and cross-platform. In this section, you'll learn about websites, web applications, web services, Universal Windows Platform (UWP) apps, and mobile apps. By the end of the book, you'll be armed with all the knowledge you need to build modern, cross-platform applications using C# and .NET.
Table of Contents (31 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
2
Part 1 – C# 7.1
8
Part 2 – .NET Core 2.0 and .NET Standard 2.0
16
Part 3 – App Models
22
Summary
Index

Chapter 2 – Speaking C#


What type would you choose for the following "numbers?"

  1. A person's telephone number.

Answer:string.

  1. A person's height.

Answer:float or double.

  1. A person's age.

Answer:int for performance or byte (0 to 255) for size.

  1. A person's salary.

Answer:decimal.

  1. A book's ISBN.

Answer:string.

  1. A book's price.

Answer:decimal.

  1. A book's shipping weight.

Answer:float or double.

  1. A country's population.

Answer:uint (0 to about 4 billion).

  1. The number of stars in the universe.

Answer:ulong (0 to about 18 quadrillion) or System.Numerics.BigInteger (allows an arbitrarily large integer).

  1. The number of employees in each of the small or medium businesses in the UK (up to about 50,000 employees per business).

Answer: Since there are hundreds of thousands of small or medium businesses, we need to take memory size as the determining factor, so choose ushort, because it only takes 2 bytes compared to an int, which takes 4 bytes.