implement Composition & Inheritance in C# with Code with Classes
https://www.saqibsomal.com/c-sharp/implement-composition-inheritance-in-c-with-code-with-classes/13
implement Composition & Inheritance in C# with Code with Classes
Composition
A “Wiki” style definition: “object composition (not to be confused with function composition) is a way to combine simple objects or data types into more complex ones.”
My definition: Allowing a class to contain object instances in other classes so they can be used to perform actions related to the class (an “has a” relationship) i.e., a person has the ability to walk.
Inheritance
Another “Wiki” style definition: inheritance is a way to form new classes (instances of which are called objects) using classes that have already been defined.
My definition: One class can use features from another class to extend its functionality (an “Is a” relationship) i.e., a Car is a Automobile.
Form Code
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms;
namespace Composition public partial class Form1 : Form public Form1() InitializeComponent();
private void button1_Click(object sender, EventArgs e) Car c1; c1 = new Car(); MessageBox.Show(c1.printCompleteDetails());
private void button2_Click(object sender, EventArgs e) Animal animal = new Animal(); animal.Greet(); Dog dog = new Dog(); dog.Greet();
private void button3_Click(object sender, EventArgs e) Cat c1=new Cat(); c1.Greet();
private void button4_Click(object sender, EventArgs e) SavingAcc s1 = new SavingAcc(1, “Ayub khan”, 100000);
Class Person.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text;
namespace Composition class Person string Pid; string Pname; int age;
public Person(string a, string b, int c) Pid = a; Pname = b; age = c;
public string printPerson() string ayub; ayub = Pid + ” ” + Pname + ” ” + Convert.ToString(age); return ayub;
Class Car.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text;
namespace Composition class Car string make; string model; Person driver;
public Car() make = “Honda”; model = “Civic”; driver = new Person(“122-0999”, “Saqib Somal”, 22);
public string printCompleteDetails() string ayub; ayub = make + ” ” + model + ” ” + driver.printPerson(); return ayub;
Class Animals.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms;
namespace Composition class Animal public virtual void Greet() MessageBox.Show(“Hello, I’m some sort of animal!”); class Dog : Animal public override void Greet() MessageBox.Show(“Hello, I’m a dog!”); class Cat : Animal public override void Greet() base.Greet();
class Account int aid; string aname; int abalance; public Account(int a, string b, int c) aid = a; aname = b; abalance = c; MessageBox.Show(“Account object created”);
class SavingAcc : Account
public SavingAcc(int a, string b, int c):base(a,b,c)
