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Hands-On Design Patterns with C# and .NET Core
Hands-On Design Patterns with C# and .NET Core

Hands-On Design Patterns with C# and .NET Core: Write clean and maintainable code by using reusable solutions to common software design problems

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Hands-On Design Patterns with C# and .NET Core

Overview of OOP in .NET Core and C#

For over 20 years, the most popular programming languages have been based on the principles of object-oriented programming (OOP). The rise in popularity of OOP languages is largely to do with the benefits of being able to abstract complex logic into a structure, called an object, that can be more easily explained, and, more importantly, reused within an application. In essence, OOP is a software design approach, that is, a pattern for developing software using the concept of objects that contain data and functionality. As the software industry matured, patterns appeared in OOP for commonly occurring problems, as they were effective in solving the same problems but across different contexts and industries. As software moved from the mainframe to client servers and then to the cloud, additional patterns have emerged to help in reducing development...

Technical requirements

This chapter contains various code examples to explain these concepts. The code is kept simple and is just for demonstration purposes. Most of the examples involve a .NET Core console application written in C#.

To run and execute the code, you will need the following:

  • Visual Studio 2019 (you can also run the application using Visual Studio 2017 version 3 or later)
  • .NET Core
  • SQL Server (the Express Edition is used in this chapter)

Installing Visual Studio

In order to run these code examples, you will need to install Visual Studio or later (you can also use your preferred IDE). To do this, follow these instructions:

  1. Download Visual Studio from the following link: https://docs.microsoft.com/en-us/visualstudio...

OOP and how classes and objects work

OOP refers to a software programming approach that uses objects defined as classes. These definitions include fields, sometimes called attributes, to store data and methods in order to provide functionality. The first OOP language was a simulation of real systems known as Simula (https://en.wikipedia.org/wiki/Simula) and was developed at the Norwegian Computing Center in 1960. The first pure OOP language came into existence in 1970 as the Smalltalk (https://en.wikipedia.org/wiki/Smalltalk) language. This language was designed to program the Dynabook (http://history-computer.com/ModernComputer/Personal/Dynabook.html), which is a personal computer created by Alan Kay. Several OOP languages evolved from there, with the most popular being Java, C++, Python, and C#.

OOP is based on objects that contain data. The OOP paradigm allows developers to...

Inheritance

One of the most important concepts in OOP is inheritance. Inheritance between classes allows us to define an is-a-type-of relationship; for example, a car is a type of vehicle. The importance of this concept is that it allows for objects of the same type to share similar features. Let's say that we have a system for managing different products of an online bookstore. We might have one class for storing information about a physical book and a different one for storing information about a digital or online book. The features that are similar between the two, such as the name, publisher, and author, could be stored in another class. Both the physical and digital book classes could then inherit from the other class.

There are different terms to describe classes in inheritance: a child or derived class inherits from another class while the class being inherited from...

Encapsulation

Encapsulation is another fundamental concept in OOP where the details of a class, that is, the attributes and methods, can be visible or not visible outside the object. With encapsulation, a developer is providing guidance on how a class should be used as well as helping to prevent a class from being handled incorrectly. For example, let's say we wanted to only allow adding PetAnimal objects by using the AddPet(PetAnimal) method. We would do this by having the PetOwner class's AddPet(PetAnimal) method available while having the Pets attribute restricted to anything outside the PetAnimal class. In C#, this is possible by making the Pets attribute private. One reason for doing this would be if additional logic was required whenever a PetAnimal class was added, such as logging or validating that the PetOwner class could have a pet.

C# supports different levels...

Polymorphism

The ability to handle different objects using the same interface is called polymorphism. This provides developers with the ability to build flexibility into applications by writing a single piece of functionality that can be applied to different forms as long as they share a common interface. There are different definitions of polymorphism in OOP, and we will distinguish between two main types:

  • Static or early binding: This form of polymorphism happens when the application is compiled.
  • Dynamic or late binding: This form of polymorphism happens when the application is running.

Static polymorphism

Static or early binding polymorphism happens at compile time and it primarily consists of method overloading, where...

Summary

In this chapter, we discussed OOP and its three main features: inheritance, encapsulation, and polymorphism. Using these features, the classes within an application can be abstracted to provide definitions that are both easy to understand and protected against being used in a manner that is inconsistent with its purpose. This is an essential difference between OOP and some earlier types of software development language such as structural and procedural programming. With the ability to abstract functionality, the ability to reuse and maintain code is increased.

In the next chapter, we will discuss various patterns used in enterprise software development. We will cover programming patterns as well as software development principles and patterns used in the Software Development Life Cycle (SDLC).

Questions

The following questions will allow you to consolidate the information contained in this chapter:

  1. What do the terms late and early binding refer to?
  2. Does C# support multiple inheritance?
  3. In C#, what level of encapsulation could be used to prevent access to a class from outside the library?
  4. What is the difference between aggregation and composition?
  5. Can interfaces contain properties? (This is a bit of a trick question.)
  6. Do dogs eat fish?
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Key benefits

  • Enhance your programming skills by implementing efficient design patterns for C# and .NET
  • Explore design patterns for functional and reactive programming to build robust and scalable applications
  • Discover how to work effectively with microservice and serverless architectures

Description

Design patterns are essentially reusable solutions to common programming problems. When used correctly, they meet crucial software requirements with ease and reduce costs. This book will uncover effective ways to use design patterns and demonstrate their implementation with executable code specific to both C# and .NET Core. Hands-On Design Patterns with C# and .NET Core begins with an overview of object-oriented programming (OOP) and SOLID principles. It provides an in-depth explanation of the Gang of Four (GoF) design patterns, including creational, structural, and behavioral. The book then takes you through functional, reactive, and concurrent patterns, helping you write better code with streams, threads, and coroutines. Toward the end of the book, you’ll learn about the latest trends in architecture, exploring design patterns for microservices, serverless, and cloud native applications. You’ll even understand the considerations that need to be taken into account when choosing between different architectures such as microservices and MVC. By the end of the book, you will be able to write efficient and clear code and be comfortable working on scalable and maintainable projects of any size.

Who is this book for?

If you have a basic understanding of C# and the .NET Core framework, this book will help you write code that is easy to reuse and maintain with the help of proven design patterns that you can implement in your code.

What you will learn

  • Make your code more flexible by applying SOLID principles
  • Follow the test-driven development (TDD) approach in your .NET Core projects
  • Get to grips with efficient database migration, data persistence, and testing techniques
  • Convert a console application to a web application using the right MVP
  • Write asynchronous, multithreaded, and parallel code
  • Implement MVVM and work with RxJS and AngularJS to deal with changes in databases
  • Explore the features of microservices, serverless programming, and cloud computing
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Language : English
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Table of Contents

18 Chapters
Section 1: Essentials of Design Patterns in C# and .NET Core Chevron down icon Chevron up icon
Overview of OOP in .NET Core and C# Chevron down icon Chevron up icon
Modern Software Design Patterns and Principles Chevron down icon Chevron up icon
Section 2: Deep Dive into Utilities and Patterns in .NET Core Chevron down icon Chevron up icon
Implementing Design Patterns - Basics Part 1 Chevron down icon Chevron up icon
Implementing Design Patterns - Basics Part 2 Chevron down icon Chevron up icon
Implementing Design Patterns - .NET Core Chevron down icon Chevron up icon
Implementing Design Patterns for Web Applications - Part 1 Chevron down icon Chevron up icon
Implementing Design Patterns for Web Applications - Part 2 Chevron down icon Chevron up icon
Section 3: Functional Programming, Reactive Programming, and Coding for the Cloud Chevron down icon Chevron up icon
Concurrent Programming in .NET Core Chevron down icon Chevron up icon
Functional Programming Practices Chevron down icon Chevron up icon
Reactive Programming Patterns and Techniques Chevron down icon Chevron up icon
Advanced Database Design and Application Techniques Chevron down icon Chevron up icon
Coding for the Cloud Chevron down icon Chevron up icon
Miscellaneous Best Practices Chevron down icon Chevron up icon
Assessments Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.8
(5 Ratings)
5 star 40%
4 star 0%
3 star 0%
2 star 20%
1 star 40%
Sjoukje Zaal Aug 31, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I was one of the first readers of the content as a technical reviewer, and I found this book well written! Gaurav and Jeff did a great job describing the different patterns and how to apply them to C# and .NET Core. On top of that, there are a lot of great code demos which can be used to put the theory into practice.I highly recommend everyone who wants to take their coding skills to the next level to read this book. I hope you enjoy reading this book as much as I did.
Amazon Verified review Amazon
Greg Leonardo Feb 13, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
If you are looking to gain more insight into designing your .Net core apps, this is the book for you. Lot’s of good nuggets.
Amazon Verified review Amazon
kuldeep kumar Sep 27, 2022
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Don’t buy. Content are not proper.Each section has design patterns but not proper explanation excatly.Examples are not clear.
Amazon Verified review Amazon
ECB Oct 11, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Poorly written. Doesn't help because it's so esoteric and examples are not clear.
Amazon Verified review Amazon
Satish May 01, 2020
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Its very poorly written and organized book, there is no connectivity and explanation from section to section. this looks like a bunch of notes from a lecture
Amazon Verified review Amazon
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