CODEWITHSUNDEEP
asp.netoopc#-4.0
Rahul
Rahul

Reputation: 5636

Why we cannot call constructor of base class from derived

I need to understand the concept that why we cannot call constructor of base class from derived. I have some scenario.

public class clsA
    {
        int i = 10;
        public void CallA()
        {
            Console.WriteLine("Called by Class A");
        }
    }

    public class clsB : clsA
    {
        int i = 20;
        public void CallB()
        {
            Console.WriteLine("Called by Class B");
        }

    }

if i do like that 

clsA _obja = new clsA();

then constructor of base class called and we get its methods.

if i do like that 

clsB _objb = new clsB();

then also constructor of base class called and we get base class methods and derived class methods as well.

if i do like that 

clsA _objab = new clsB();

then constructor of base class called and we get its methods.

But now my question is that why we cannot call constructor of base class from derived class like

clsB _objb = new clsA();

Please suggest me. I want simple answer.

Upvotes: 0

Views: 88

Answers (1)

BJ Myers
BJ Myers

Reputation: 6823

This has nothing to do with the constructor calls. The problem is that you can't assign an instance of a parent class to a variable of a child class. A clsB instance is a clsA, but a clsA object is not necessarily a clsB.

Upvotes: 3

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