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

Generating random numbers


Sometimes you need to generate random numbers, perhaps in a game that simulates rolls of a die, or for use with cryptography in encryption or signing.

There are a couple of classes that can generate random numbers in .NET Standard, as shown in the following diagram:

Generating random numbers for games

In scenarios that don't need truly random numbers, you can use the Random class, as shown in the following code example:

var r = new Random();

Random has a constructor with a parameter for specifying a seed value used to initialize a pseudo-random number generator, as shown in the following code:

var r = new Random(Seed: 12345);

Note

Good Practice As you learned in Chapter 2, Speaking C#, parameter names should use camel case. The developer who defined the constructor for the Random class broke this convention! The parameter name should be seed, not Seed.

Note

Shared seed values act as a secret key, so if you use the same random number generation algorithm with the same seed...