CODEWITHSUNDEEP
c#
user584018
user584018

Reputation: 11354

can we call method M1 for abstract class A?

experts,

below is code for abstract class with virtual method and override in class B.

Can we call method M1 of class A, as we can't instantiate this? thanks,

public abstract class A
{
    public virtual int M1(int a, int b)
    {
        return a + b;
    }
}

public class B : A
{
    public override int M1(int a, int b)
    {
        return a - b;
    }
}

Upvotes: 0

Views: 74

Answers (2)

MarcinJuraszek
MarcinJuraszek

Reputation: 125650

As soon as B overrides M1 virtual method dispatch will make B.M1() being called, even when you cast instance of B to A.

The only place you can call it is from within B code, using base.M1() syntax:

public override int M1(int a, int b)
{
    var temp = base.M1(a, b);
    return temp - a - b;
}

However, there can be another class inheriting from A (lets name it C), which does not override M1. In that case, calling M1 on instance of C will invoke A.M1().

Upvotes: 1

kondas
kondas

Reputation: 193

You must instantiate a class that implements A1, virtual is a method you CAN override but if you don't it will execute the base class method.

Upvotes: 0

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