What is Abstract Class in C#.Net,How to use Abstract Class in c#.net

•    Abstract class is one type of half define parent class.
•    Its complete implementation is in child class.
•    You cannot create object of abstract class.
•    You can use this abstract class by make its child class and call parent class (Abstract class) method using child class object ass show in Ex.

Example:

namespace CA_AbstactClass

{

    // define abstract class

    abstract class operation

    {

        // define abstract method

        //you can only define but on not implement the method in this class

        public abstract int addition(int n1,int n2);

        // define non abstract method

        public int multiplication(int n1, int n2)

        {

            return n1 * n2;

        }

       

    }

    class Program:operation

    {

        static void Main(string[] args)

        {

            // you can create object of 'Program' class but not 'operation' class

            Program objProgram = new Program();

     int add =objProgram.addition(10,20);

            int mul=objProgram.multiplication(10,20);

            Console.WriteLine("Added : {0}, Multiplied : {1}", add, mul);

        }

       

        // now override the addition method in this class

        // access modifier of abstract method must be same in parent class and child class

        public override int addition(int n1, int n2)

        {

            return n1 + n2;

        }

    }

}

• If you  have use multiple abstract class they inherit each other than you can implement  abstract method of parent abstract class in child abstract class.

Example:

namespace CA_AbstactClass

{

    // define abstract class

    abstract class operation

    {

        // define abstract method

        //you can only define but on not implement the method in this class

        public abstract int addition(int n1, int n2);

        // define other abstract method

        public abstract int multiplication(int n1, int n2);

    }

   

    abstract class operation1:operation

    {

        // Implementing abstract method

        public override int multiplication(int n1, int n2)

        {

            return n1*n2;

        }

       

    }

    class Program : operation1

    {

        static void Main(string[] args)

        {

            // you can create object of 'Program' class but not 'operation' class

            Program objProgram = new Program();

            int add =objProgram.addition(10,20);

            int mul=objProgram.multiplication(10,20);

            Console.WriteLine("Added : {0}, Multiplied : {1}", add, mul);

        }

        // now override the addition method in this class

        // access modifier of abstract method must be same in parent class and child  class

        public override int addition(int n1, int n2)

        {

            return n1 + n2;

        }

    }

}

    Rules For Abstract class
•    Abstract class can have abstract method or non-abstract method also
•    Abstract method cannot be private.
•    Abstract class cannot be sealed.
•    Abstract method cannot be virtual
•    Abstract member can note be static.
•    Abstract method must be define in only abstract class.


See Also :

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• How to find the product Key of Windows XP CD

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