Object-Oriented Programming

Object-oriented programming (OOP) is a programming paradigm that organizes code into objects, which are instances of classes. In C#, every piece of code you write is inside a class.

Classes and Objects

A class is a blueprint for creating objects. It defines the properties and behaviors that an object of that class will have. For example, you can have a Person class that represents a person with properties like Name and Age.

1class Person
2{
3    public string Name { get; set; }
4    public int Age { get; set; }
5}

To create an object of a class, you use the new keyword followed by the class name and parentheses.

1Person person = new Person();

In this example, person is an object of the Person class.

Properties

Properties are used to encapsulate data and provide a way to access and modify it. They define the characteristics of an object. In the Person class example above, Name and Age are properties.

Constructors

A constructor is a special method that is called when an object is created. It initializes the object's state and sets its initial values. In the Person class example, there is a constructor that takes two parameters (name and age) and sets the Name and Age properties of the object.

Methods

Methods are functions that define the behavior of an object. They can perform specific actions and can be called on objects of the class. In the Person class example, there is a Greet method that prints a greeting message using the Name and Age properties.

Example

Here's an example that demonstrates the concepts of classes, objects, properties, constructors, and methods in C#:

1class Person
2{
3    // Properties
4    public string Name { get; set; }
5    public int Age { get; set; }
6
7    // Constructor
8    public Person(string name, int age)
9    {
10        Name = name;
11        Age = age;
12    }
13
14    // Method
15    public void Greet()
16    {
17        Console.WriteLine($"Hello, my name is {Name} and I'm {Age} years old.");
18    }
19}
20
21// Create an instance of Person
22Person person = new Person("John", 25);
23
24// Call the Greet method
25person.Greet();

In this example, we define a Person class with Name and Age properties, a constructor that initializes the properties, and a Greet method that prints a greeting message. We then create an instance of the Person class named person with the name "John" and age 25, and call the Greet method to print the greeting message.

Object-oriented programming is a powerful concept that allows you to create reusable and modular code. It provides a way to model real-world entities and interactions in your programs.

Keep coding and exploring the world of object-oriented programming!

xxxxxxxxxx

class Person

{

    // Properties

    public string Name { get; set; }

    public int Age { get; set; }

​

    // Constructor

    public Person(string name, int age)

    {

        Name = name;

        Age = age;

    }

​

    // Method

    public void Greet()

    {

        Console.WriteLine($"Hello, my name is {Name} and I'm {Age} years old.");

    }

}

​

// Create an instance of Person

Person person = new Person("John", 25);

​

// Call the Greet method

person.Greet();