New modifier are expected to hide base methods. The new modifier specifies that a method is supposed to hide a base method. It eliminates a warning issued by the compiler. No functionality is changed. But an annoying warning is silenced.
e.g.:This program introduces two classes, A and B. The B class derives from the A class. Next, class A has a public method Y, while class B has a public method Y that uses the new keyword to hide the base method Y.
Class
Note:
The new keyword prevents a warning from the C# compiler when this program is compiled.
using System;
class A
{
public void Y()
{
Console.WriteLine("A.Y");
}
}
class B : A
{
public new void Y()
{
// This method HIDES A.Y.
// It is only called through the B type reference.
Console.WriteLine("B.Y");
}
}
class Program
{
static void Main()
{
A ref1 = new A(); // Different new
A ref2 = new B();
B ref3 = new B();
ref1.Y();
ref2.Y();
ref3.Y();
}
}
Output
A.Y
A.Y
B.Y
In this example, we use the A and B types. With ref1, the base class is used directly. This results in the A.Y method being used. For ref2, the base class is used with a derived class. This results in the A.Y method being used again.
Tip:
For ref2, the A.Y method is used because the override keyword is not used on B.Y.
Override
Finally:
With ref3, the derived class is used directly. The "new" method B.Y is thus used.
