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C# 7 and .NET Core Cookbook
C# 7 and .NET Core Cookbook

C# 7 and .NET Core Cookbook: Serverless programming, Microservices and more , Second Edition

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C# 7 and .NET Core Cookbook

Classes and Generics

Classes form the building blocks of software development and are essential for building good code. In this chapter, we will be looking at classes and generics and why we need to use them. The recipes we will be covering are as follows:

  • Creating and implementing an abstract class
  • Creating and implementing an interface
  • Creating and using a generic class or method
  • Creating and using a generic interface

Introduction

As you probably know, classes are simply containers for related methods and properties to describe an object in your software. An object is an instance of a specific class and, sometimes, mimics real-world things. When thinking of a car, you might create a vehicle class that contains certain attributes (properties) that all vehicles contain, such as automatic or manual transmission, wheel count (not all vehicles have only four wheels), or fuel type.

When we create an instance of the vehicle class, we can create a car object, an SUV object, and so on. Here lies the power of classes, which is to describe the world around us and translate it into a programming language that a compiler can understand.

Creating and implementing an abstract class

Many developers have heard about abstract classes, but their implementation is a mystery. How can you as a developer identify an abstract class and decide when to use one? The definition is quite a simple one actually. Once you understand this fundamental definition of an abstract class, when and why to use one becomes obvious.

Imagine for a moment that you are developing an application that manages the animals in a cat sanctuary. The cat sanctuary rehabilitates lions, tigers, jaguars, leopards, cheetahs, pumas, and even domestic cats. The common noun that describes all these animals is the word cat. You can, therefore, safely assume that the abstraction of all these animals is a cat, and thus, this word identifies our abstract class. You would then create an abstract class called Cat.

However, you need to keep in mind that you will never ever create an instance of the...

Creating and implementing an interface

For many developers, interfaces are equally confusing and their purpose not clearly understood. Interfaces are actually quite easy to get to grips with once you understand the concept that defines an interface.

Interfaces act like verbs. So, for example, if we had to create two classes called Lion and Tiger that derive from the Cat abstract class, the interface would describe some sort of action. Lions and tigers can roar (but not purr). We can then create an interface called IRoarable. If we had to derive a class called Cheetah from our abstract class Cat, we would not be able to use the IRoarable interface, because cheetahs purr. We would need to create an IPurrable interface.

Getting ready

Creating an interface is very similar...

Creating and using a generic class or method

Generics is a very interesting way of writing code. Instead of specifying the data type of the elements in the code at design time, you can actually delay the specification of those elements until they are used in code. This basically means that your class or method can work with any data type.

Getting ready

We will start off by writing a generic class that can take any data type as a parameter in its constructor and do something with it.

How to do it...

  1. Declaring a generic class is actually very easy. All that we need to do is create the class with the generic type parameter...

Creating and using a generic interface

Generic interfaces work in much the same way as the previous examples in generics. Let's assume that we want to find the properties of certain classes in our code, but we can't be sure how many classes we will need to inspect. A generic interface could come in very handy here.

Getting ready

We need to inspect several classes for their properties. To do this, we will create a generic interface that will return a list of all the properties found for a class as a list of strings.

How to do it...

Let's take a look at the following implementation of the generic interface...

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Key benefits

  • Easy-to-follow recipes to get you up-and-running with the new features of C# 7 and .NET Core 1.1
  • Practical solutions to assist you with microservices and serverless computing in C#
  • Explore the new Visual Studio environment and write more secure code in it

Description

C# has recently been open-sourced and C# 7 comes with a host of new features for building powerful, cross-platform applications. This book will be your solution to some common programming problems that you come across with C# and will also help you get started with .NET Core 1.1. Through a recipe-based approach, this book will help you overcome common programming challenges and get your applications ready to face the modern world. We start by running you through new features in C# 7, such as tuples, pattern matching, and so on, giving you hands-on experience with them. Moving forward, you will work with generics and the OOP features in C#. You will then move on to more advanced topics, such as reactive extensions, Regex, code analyzers, and asynchronous programming. This book will also cover new, cross-platform .NET Core 1.1 features and teach you how to utilize .NET Core on macOS. Then, we will explore microservices as well as serverless computing and how these benefit modern developers. Finally, you will learn what you can do with Visual Studio 2017 to put mobile application development across multiple platforms within the reach of any developer.

Who is this book for?

The book will appeal to C# and .NET developers who have a basic familiarity with C# and the Visual Studio 2015 environment

What you will learn

  • Writing better and less code to achieve the same result as in previous versions of C#
  • Working with analyzers in Visual Studio
  • Working with files, streams, and serialization
  • Writing high-performant code in C# and understanding multi-threading
  • Demystifying the Rx library using Reactive extensions
  • Exploring .Net Core 1.1 and ASP.NET MVC
  • Securing your applications and learning new debugging techniques
  • Designing and building a microservice architecture
  • Using Azure and AWS for serverless computing with C#
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Publication date : Apr 25, 2017
Length: 628 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787286276
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Length: 628 pages
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Language : English
ISBN-13 : 9781787286276
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Microsoft
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Table of Contents

16 Chapters
New Features in C# 7.0 Chevron down icon Chevron up icon
Classes and Generics Chevron down icon Chevron up icon
Object-Oriented Programming in C# Chevron down icon Chevron up icon
Code Analyzers in Visual Studio Chevron down icon Chevron up icon
Regular Expressions Chevron down icon Chevron up icon
Working with Files, Streams, and Serialization Chevron down icon Chevron up icon
Making Apps Responsive with Asynchronous Programming Chevron down icon Chevron up icon
High Performance Programming Using Parallel and Multithreading in C# Chevron down icon Chevron up icon
Composing Event-Based Programs Using Reactive Extensions Chevron down icon Chevron up icon
Exploring .NET Core 1.1 Chevron down icon Chevron up icon
ASP.NET Core on the MVC Framework Chevron down icon Chevron up icon
Choosing and Using a Source Control Strategy Chevron down icon Chevron up icon
Creating a Mobile Application in Visual Studio Chevron down icon Chevron up icon
Writing Secure Code and Debugging in Visual Studio Chevron down icon Chevron up icon
Creating Microservices on Azure Service Fabric Chevron down icon Chevron up icon
Azure and Serverless Computing Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.3
(6 Ratings)
5 star 33.3%
4 star 0%
3 star 33.3%
2 star 33.3%
1 star 0%
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wynix Jun 08, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Easy to understand, but very basic, definitely for learners.
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Thor Kornbrek Sep 19, 2017
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This book provides content that can improve any developers game. There are a number of areas covered that I had been interested in but not had the time to really work with: Cordova, Asp.Net Core, and Azure Functions. This book delivers enough examples to get started in those areas and the vocabulary to further research where needed.I am sure you will find something to stretch your skills in this text. The power of C# and .Net Core is clearly demonstrated with screen-shots and step by step examples. I am going to keep a copy of this around as a reference as well.
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Bharat Nov 08, 2018
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Pages are not as good as expected
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Amazon Customer Oct 25, 2017
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Its easy to read and need less time to finish. Around 600 pages but less content. Page content is very less most of the pages have just dialog box or image only.
Amazon Verified review Amazon
Håvard Oct 21, 2018
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
The overall consept of this book is good. I have read a few chapters which gave me some valuable input. I skipped to the chapter about regular expressions, and started following the examples given in the text.That's when trouble started. The code for date validation and text sanitation given in the book will not work. The (not so) funny thing is that there is actually two lines for date validation which show a pattern that will work. But the portion saying something like "this is how it should look" will never work.If you download the source code, there it seems as if you will find working examples.Two stars, errors like this should have been found before this book hit the market. It seems as if the Packt books are rushed through the system, with not enough time for QA.
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