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

Inheriting and extending .NET types


.NET has prebuilt class libraries containing hundreds of thousands of types. Rather than creating your own completely new types, you can often start by inheriting from one of Microsoft's.

Inheriting from an exception

In the PacktLibrary project, add a new class named PersonException, as shown in the following code:

using System; 
 
namespace Packt.CS7 
{ 
   public class PersonException : Exception 
   { 
      public PersonException() : base() { } 
      public PersonException(string message) : base(message) { } 
      public PersonException(string message, Exception innerException) : 
      base(message, innerException) { } 
   } 
}

Note

Unlike ordinary methods, constructors are not inherited, so we must explicitly declare and explicitly call the base constructor implementations in System.Exception to make them available to programmers who might want to use those constructors in our custom exception.

In the Person class, add the following method:

public void...