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

Casting and converting between types


You will often need to convert between different types. For example, data input is often done into a text field, so it is initially stored in a variable of the string type, but it then needs to be converted into a date, or time, or number, or some other data type, depending on how it should be stored and processed.

Casting has two varieties: implicit and explicit. Implicit casting happens automatically and it is safe, meaning that you will not lose any information. Explicit casting must be performed manually because it may lose information, for example, the accuracy of a number. By explicitly casting, you are telling the C# compiler that you understand and accept the risk.

Add a new console application project named CastingConverting.

Casting from numbers to numbers

Implicitly casting an int variable into a double variable is safe.

Casting numbers implicitly

In the Main method, enter the following statements:

int a = 10;
double b = a; // an int can be stored...