Using the 'new' modifier in C#

Question

I read that the new modifer hides the base class method.

using System;

class A
{
    public void Y()
    {
        Console.WriteLine(\"A.Y\");
         


        

Answer 1

In C#, methods are not virtual by default (unlike Java). Therefore, ref2.Y() method call is not polymorphic.

To benefit from the polymorphism, you should mark A.Y() method as virtual, and B.Y() method as override.

What new modifier does is simply hiding a member that is inherited from a base class. That's what really happens in your Main() method:

A ref1 = new A();
A ref2 = new B();
B ref3 = new B();

ref1.Y(); // A.Y
ref2.Y(); // A.Y - hidden method called, no polymorphism
ref3.Y(); // B.Y - new method called