Inheritance is one of the fundamental attributes of
object-oriented programming. It allows you to define a child class that reuses
(inherits), extends, or modifies the behavior of a parent class. Inheritance is
a feature of object-oriented programming languages that allows you to define a
base class that provides specific functionality (data and behavior) and to
define derived classes that either inherit or override that functionality, so
Inheritance is one of the primary concepts of object-oriented programming. It
allows you to reuse the existing code.
Example of Inheritance
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace InheritanceExampleNamespace
{
public class ParentClass
{
string parentString;
public ParentClass()
{
Console.WriteLine("i am Parent Constructor.");
}
public ParentClass(string myString)
{
parentString = myString;
Console.WriteLine(parentString);
}
public void print()
{
Console.WriteLine("I'm a Parent Class method .");
}
}
public class ChildClass : ParentClass
{
public ChildClass() : base("From Derived")
{
Console.WriteLine(" i am Child Constructor.");
}
public new void print()
{
base.print();
Console.WriteLine("I'm a Child Class method .");
}
public static void Main()
{
ChildClass objchild = new ChildClass();
objchild.print();
((ParentClass)objchild).print();
Console.ReadLine();
}
}
}
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Types of inheritance in C#.
1. Single Inheritance
2. Hierarchical Inheritance
3. Multi-Level Inheritance
4. Multiple (using Interface) Inheritance
2. Hierarchical Inheritance
3. Multi-Level Inheritance
4. Multiple (using Interface) Inheritance
Syntax of Single Inheritance
Example of Single Inheritance:-
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace InheritanceExampleNamespace
{
//single Inheritance
public class A
{
public void welcome()
{
Console.WriteLine("welcome to Inheritance world , i am inside class A");
}
}
public class B : A //class B is derived by class A
{
public void Hello()
{
Console.WriteLine("inside Hello function of class B");
}
}
public class singleInheritanceExampleClass
{
public static void Main()
{
B obj = new B(); //create obj of child class
obj.welcome(); // call the function of Class A (base class)
obj.Hello(); // call the function of child class (drived class)
Console.ReadLine();
}
}
}
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Hierarchical inheritance
In hierarchical inheritance there are multiple classes derived from one base class.
Example of Hierarchical inheritance
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace InheritanceExampleNamespace
{
//Hierarchical Inheritance
public class A
{
public void welcome()
{
Console.WriteLine("welcome to Inheritance world , i am inside class A");
}
}
public class B : A //class B is derived by class A
{
public void Hello()
{
Console.WriteLine("inside Hello function of class B");
}
}
public class C : A //class C is derived by class A
{
public void ClassC_Hello()
{
Console.WriteLine("inside ClassC_Hello function of class C");
}
}
public class singleInheritanceExampleClass
{
public static void Main()
{
C obj = new C(); //create obj of class C
obj.welcome(); // call the function of Class A (base class)
obj.ClassC_Hello();
B objB = new B(); //create obj of class B
objB.welcome();// call the function of Class A (base class)
objB.Hello(); // call the function of B class
Console.ReadLine();
}
}
}
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Multilevel inheritance
In Multilevel inheritance one class is derived from another derived class.
Example of Multilevel inheritance:-
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace InheritanceExampleNamespace
{
//MultiLevel Inheritance
public class A
{
public void welcome()
{
Console.WriteLine("welcome to Inheritance world , i am inside class A");
}
}
public class B : A //class B is derived by class A
{
public void Hello()
{
Console.WriteLine("inside Hello function of class B");
}
}
public class C : B //class C is derived by class B
{
public void ClassC_Hello()
{
Console.WriteLine("inside ClassC_Hello function of class C");
}
}
public class singleInheritanceExampleClass
{
public static void Main()
{
C obj = new C(); //create obj of child class
obj.welcome(); // call the function of Class A (base class)
obj.Hello(); // call the function of child class (parent class)
obj.ClassC_Hello();
Console.ReadLine();
}
}
}
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