Use of shadows keyword in VB.NET
.NET, Shadows, VB.NET, Visual Basic 2010
In this article We will learn how to use shadows in
VB.NET.
Shadows:
Use shadows to define method hiding explicitly. If There are overloaded
methods in the base class and you marks one of the methods as shadows using the
keyword shadow in the derived class, then we cannot access the overloaded
methods. OR the child member temporarily hides the parent member and activates
its own. This is called shadowing. The purpose of shadows is to Protects
against a subsequent base-class modification that introduces a member you have
already defined in your derived class.If you do not specify either Shadows or
Overrides, the compiler issues a warning message to help you be sure which kind
of redefinition you want to use. If you ignore the warning, the shadowing
mechanism is used.
Module
Module1
Class
A
Public Sub
Show()
Console.WriteLine("Calling
from A")
End Sub
End Class
Class
B
Inherits
A
Public Shadows
Sub Show()
Console.WriteLine("Calling
from B")
End Sub
End Class
Class
C
Inherits
B
Public Shadows
Sub Show()
Console.WriteLine("Calling
from C")
End Sub
End Class
Class
Test
Public Shared
Sub Main()
Dim x As
A
x =
New A()
x.Show()
x =
New B()
x.Show()
x =
New C()
x.Show()
End Sub
End Class
End
Module
OUTPUT:
If we do not use the shadows keyword in the derived
class it gives an warning at compile time but does not effect at the run time.