Data Abstraction Example in C#

Data Abstraction Example in C#:-

To hide the internal functionality of the program is managed by data abstraction, It is used to provide security and accessibility in an application.

How to implement Data Abstraction:-

1)   Using Access Specifier:- 

1.1)  Private:-     We can not call outside of the class

1.2) Protected:-  We can access from base class to derived class in the same project and cross-project

1.3)  Internal:-   We can access from all classes in the same project

1.4) Public:-      We can access public data member and member function outside of the project.

1.5) Protected Internal:-  Combine Features of Protected and Internal both.

Now I am providing a practical example of data abstraction using access-specifier:-

1)  Create a class and define all method with all possible access specifier

class DataabstractionExample

    {

        private void fun1()

        {

            Console.WriteLine("Private");

        }

        internal void fun2()

        {

            Console.WriteLine("Internal");

        }

        protected internal void fun3()

        {

            Console.WriteLine("Protected Internal");

        }

        public void fun4()

        {

            Console.WriteLine("Publ ic");

        }

        protected void fun5()

        {

            Console.WriteLine("Protected");

        }

    }

2)  Create another class in the same project to call these functions, only private and protected not call otherwise all functions will be accessable.

 class DataabstractionExample2

    {

        static void Main()

        {

            DataabstractionExample obj = new DataabstractionExample();

            obj.fun2();

            obj.fun3();

            obj.fun4();

            Console.ReadKey();

        }

    }

3) Now creating another class and inherit from Dataabstractionclass then excluding private method all other methods will be called.

class DataabstractionExample3:DataabstractionExample

    {

        static void Main()

        {

            DataabstractionExample3 obj = new DataabstractionExample3();

            obj.fun2();

            obj.fun3();

            obj.fun4();

            obj.fun5();

            Console.ReadKey();

        }

    }

4)  Now creating another project and add the project reference of the first project to a second project using add reference options and call method then only public access specifier will be called.

When we add reference then right-click on references options ----> Add References--> Browse Project---->  bin ---> debug--> Projectname.exe ----  Click on Add button.

Create the following class:-

using ConsoleApplication4;

namespace ConsoleApplication5

{

    class Program

    {

        static void Main(string[] args)

        {

            DataabstractionExample obj = new DataabstractionExample();

            obj.fun4();

            Console.ReadKey();

        }

    }

}

Now again inherit the class than public and protected both will be accessible when we create the object of the child class.

class Program:DataabstractionExample

    {

        static void Main(string[] args)

        {

            Program obj = new Program();

            obj.fun4();

            obj.fun3();

            obj.fun5();

            Console.ReadKey();

        }

    }

2)   Using Abstract class:-

Discuss this concept on the abstract class topic

3)   Using Interface:- 

Discuss this concept on Interface Topic.