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Hands-On Object-Oriented Programming with C#
Hands-On Object-Oriented Programming with C#

Hands-On Object-Oriented Programming with C#: Build maintainable software with reusable code using C#

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Hands-On Object-Oriented Programming with C#

Hello OOP - Classes and Objects

Object-oriented programming (OOP) is something special. If you search the internet for books on OOP, you'll find hundreds of books on this topic. But still this topic will never become stale as it is the most efficient and most commonly used programming methodology in the industry. With the increase in the demand for software developers, there has also been an increase in the demand for good learning content. Our approach in this book is to describe the concepts of OOP in the simplest way. Understanding the basics of OOP is a must for developers who want to work with C#, as C# is a fully OOP language. In this chapter, we will try to understand what OOP actually is and the most basic concepts of OOP that are essential to begin our programming journey. Before anything else, let's first start by analyzing the meaning of the term object-oriented...

Classes in OOP

In OOP, you derive objects from classes. In this section, we'll take a closer look at what a class actually is.

Classes are one of the most important concepts in OOP. You can say they are the building blocks of OOP. A class can be described as the blueprint of an object.

A class is like a template or blueprint that tells us what properties and behaviors an instance of this class will have. In most circumstances, a class itself can't actually do anything—it is just used to create objects. Let's look at an example to demonstrate what I am saying. Let's say we have a Human class. Here, when we say Human, we don't mean any particular person, but we are referring to a human being in general. A human that has two hands, two legs, and a mouth, and which can also walk, talk, eat, and think. These properties and their behaviors are applicable...

Objects in OOP

We now know what a class is. Now let's look at what object refers to in OOP.

An object is an instance of a class. In other words, an object is an implementation of a class. For example, in our banking application, we have a Customer class, but that doesn't mean that we actually have a customer in our application. To create a customer, we have to create an object of the Customer class. Let's say that we have a customer called Mr. Jack Jones. For this customer, we have to create an object of the Customer class, where the name of the person is Jack Jones.

As Mr. Jones is our customer, this means that he also has an account in our bank. To create a bank account for Mr. Jones, we have to create an object of the BankAccount class.

How to create objects

...

Variables in C#

In the previous code, you might have noticed that we created a few variables. A variable is something that varies, which means it is not constant. In programming, when we create a variable, the computer actually allocates a space in memory for it so that a value of the variable can be stored there.

Let's assign some values to the variables of the objects that we created in the previous section. We will first work with the customer1 object, as shown in the following code:

using System;

namespace Chapter2
{
public class Code_2_2
{
static void Main(string[] args)
{
Customer customer1 = new Customer();
customer1.firstName = "Molly";
customer1.lastName = "Dolly";
customer1.phoneNumber = "98745632";
customer1.emailAddress = "mollydolly@email.com";

...

Methods in a class

Let's talk about another important topic—namely methods. A method is a piece of code that is written in the code file and can be reused. A method can hold many lines of code, which will be executed when it is called. Let's take a look at the general form of a method:

access-modifier return-type method-name(parameter-list) {
// method body
}

We can see that the first thing in the method declaration is an access-modifier. This will set the access permission of the method. Then, we have the return-type of the method, which will hold the type that the method will return, such as string, int, double, or another type. After that, we have the method-name and then brackets, (), which indicate that it is a method. In the brackets, we have the parameter-list. This can either be empty or can contain one or more parameters. Finally, we have curly brackets...

Characteristics of OOP

OOP is one of the most important programming methodologies nowadays. The whole concept depends on four main ideas, which are known as the pillars of OOP. These four pillars are as follows:

  • Inheritance
  • Encapsulation
  • Polymorphism
  • Abstraction

Inheritance

The word inheritance means receiving or deriving something from something else. In real life, we might talk about a child inheriting a house from his or her parents. In that case, the child has the same power over the house that his parents had. This concept of inheritance is one of the pillars of OOP. In programming, when one class is derived from another class, this is called inheritance. This means that the derived class will have the same properties...

Summary

This chapter covers classes and objects, the most important building blocks of OOP. These are the two things that we should learn before jumping into any other topics in OOP. It is important to make sure that these concepts are clear in our minds before moving on to other ideas. In this chapter, we learned about what a class is and why it's needed in OOP. We also looked at how to create a class in C# and how to define an object. After that, we looked at the relationship between classes and objects and how to instantiate a class and use it. We also talked about variables and methods in a class. Lastly, we covered the four pillars of OOP. In the next chapter, we will learn more about inheritance and class hierarchy.

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Key benefits

  • Understand the four pillars of OOP; encapsulation, inheritance, abstraction and polymorphism
  • Leverage the latest features of C# 8 including nullable reference types and Async Streams
  • Explore various design patterns, principles, and best practices in OOP

Description

Object-oriented programming (OOP) is a programming paradigm organized around objects rather than actions, and data rather than logic. With the latest release of C#, you can look forward to new additions that improve object-oriented programming. This book will get you up to speed with OOP in C# in an engaging and interactive way. The book starts off by introducing you to C# language essentials and explaining OOP concepts through simple programs. You will then go on to learn how to use classes, interfacesm and properties to write pure OOP code in your applications. You will broaden your understanding of OOP further as you delve into some of the advanced features of the language, such as using events, delegates, and generics. Next, you will learn the secrets of writing good code by following design patterns and design principles. You'll also understand problem statements with their solutions and learn how to work with databases with the help of ADO.NET. Further on, you'll discover a chapter dedicated to the Git version control system. As you approach the conclusion, you'll be able to work through OOP-specific interview questions and understand how to tackle them. By the end of this book, you will have a good understanding of OOP with C# and be able to take your skills to the next level.

Who is this book for?

This book is designed for people who are new to object-oriented programming. Basic C# skills are assumed, however, prior knowledge of OOP in any other language is not required.

What you will learn

  • Master OOP paradigm fundamentals
  • Explore various types of exceptions
  • Utilize C# language constructs efficiently
  • Solve complex design problems by understanding OOP
  • Understand how to work with databases using ADO.NET
  • Understand the power of generics in C#
  • Get insights into the popular version control system, Git
  • Learn how to model and design your software
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Length: 288 pages
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Language : English
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Table of Contents

15 Chapters
Overview of C# as a Language Chevron down icon Chevron up icon
Hello OOP - Classes and Objects Chevron down icon Chevron up icon
Implementation of OOP in C# Chevron down icon Chevron up icon
Object Collaboration Chevron down icon Chevron up icon
Exception Handling Chevron down icon Chevron up icon
Events and Delegates Chevron down icon Chevron up icon
Generics in C# Chevron down icon Chevron up icon
Modeling and Designing Software Chevron down icon Chevron up icon
Visual Studio and Associated Tools Chevron down icon Chevron up icon
Exploring ADO.NET with Examples Chevron down icon Chevron up icon
New Features in C# 8 Chevron down icon Chevron up icon
Understanding Design Patterns and Principles Chevron down icon Chevron up icon
Git - The Version Control System Chevron down icon Chevron up icon
Prepare Yourself - Interviews and the Future 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 Full star icon Half star icon Empty star icon 3.5
(4 Ratings)
5 star 50%
4 star 0%
3 star 0%
2 star 50%
1 star 0%
Sandra I Herrera-Vazquez Dec 04, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent book for programming
Amazon Verified review Amazon
Roland Dec 09, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book helps a lot with my software development studies. However, if you want to learn C#, this book won't be suitable for you. This book is good for learning OOP with C#.
Amazon Verified review Amazon
Blair P. Jun 14, 2021
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
I found that the book was easy enough to read and get through. I would classify myself as a programmer making the transition between junior to mid. I am self taught, so any good book I can get is very useful. Since I have been coding a few years now in the Microsoft stack, I feel I know my way around pretty well. I was hoping to get more of a technical understanding of C# since I use it so much.The book touches on most of the important parts of programming in C#, but I don't feel it gets in depth enough to help grasp any of the concepts well enough to use them in a practical manner. The topic is introduced, the author starts to explain it, and then moves on to the next subject.Bottom line is it feels like I have more questions than answers now and I'm not sure where to turn next. I wouldn't recommend it if you're in a similar position as me. Might be good for a person very new to C# and/or programming in general.
Amazon Verified review Amazon
Amazon Customer Dec 21, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
The author introduces material with little or no practical information to go along with it, i.e. how to actually use the topics he's discussing, and his writing style seems discombobulated. There is a lot of surface information about .NET and Visual Studio, but it doesn't go into detail about anything in a meaningful way. New syntax is introduced with no discussion on how it works and with no examples. The very first example program is dozens of lines long and makes use of programming constructs that haven't been covered. This book is not a good book to learn a new language from in my opinion. It should also be known that I am well versed in the C programming language, so I can't imagine the difficulty in being totally new to programming and trying to learn from this book.To be fair to the author, it does appear that he knows the language and the technologies very well, but I think he does not know how to write an effective textbook on the subject.
Amazon Verified review Amazon
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