CODEWITHSUNDEEP
c#oop
Nitheen Rao
Nitheen Rao

Reputation: 210

How inheritance will work with different class objects

Here is an Inheritance question. I was trying to understand TAG1 to TAG3 Process. what exactly going happen and hold which class reference. Looking forward to your suggestion. 

static void Main(string[] args)
{
    B b = new B(); **// What Happens here  TAG1**
    A a = b;       **//What Happens here TAG2**
    B x = new A() as B; **//what happens here TAG3**
    a.F();   
    a.G();
    a.H();
    a.Z();

    b.F();
    b.G();
    b.H();
    b.Z();

    x.F();
    Console.ReadLine();
}

public class A
{
    public void F() { Console.WriteLine("A.F"); }
    public virtual void G() { Console.WriteLine("A.G"); }
    public virtual void H() { Console.WriteLine("A.H"); }
    public void Z() { Console.WriteLine("A.Z"); }
}

public class B : A
{
    new public void F() { Console.WriteLine("B.F"); }
    public override void G() { Console.WriteLine("B.G"); }
    new public void H() { Console.WriteLine("B.H"); }
}

Upvotes: 1

Views: 46

Answers (1)

Marius Bancila
Marius Bancila

Reputation: 16328

B b = new B(); **// What Happens here  TAG1**

An instance of B is created here, and b holds a reference to it.

A a = b;       **//What Happens here TAG2**

a is assigned that b instance, which means you can access the A part of the previously crated B object.

B x = new A() as B; **//what happens here TAG3**

You create an A object and cast it to B, but the cast is gonna fail and return null. Therefore x will not reference the instance of an object.

Upvotes: 2

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