Hi,

I need a help regarding writing an application which has two components
which are inherited by a base component and depending on
which object is associated during the calling the methods in the
derived components should get called.


How does VB.NET supports this approach.


Thanks in Advance.

If I understand you correctly, you have a base class and two components
derived from this base class, right? If so, unless you explicitly call the
base class methods or properties using MyBase, it will be the overiding
methods that are called, when you call a method on an instance of you
component. However, if you choose not to override a method or property in
the derived class, the base class method or property is called. Does that
make sense?

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Well, your post is a bit vague, but I think I get the general idea.

You have a base component class. (We'll call it BaseComponent.)
You have two other components that derive from the base component
class. (DeriveComponentA and DerivedComponentB.)
You want to have a method that takes a type of the BaseComponent and
invokes the appropriate method on the derived component.

Good news! Visual Basic .NET completely supports this functionality.

Public MustInherit Class BaseComponent
    Public MustOverride Sub DoSomething()
    End Sub
End Class

Public Class DerivedComponentA
    Inherits BaseComponent

    Public Overrides Sub DoSomething()
        Debug.WriteLine("This is DerivedComponentA!")
    End Sub
End Class

Public Class DerivedComponentB
    Inherits BaseComponent

    Public Overrides Sub DoSomething()
        Debug.WriteLine("This is DerivedComponentB!")
    End Sub
End Class

Public Sub Main()
    DoSomeOtherStuff(New DerivedComponentA())
    DoSomeOtherStuff(New DerivedComponentB())
End Sub

Private Sub DoSomeOtherStuff(ByVal c As DerivedComponent)
    c.DoSomething()
End Sub


That should do what you want, unless I completely misconstrued your
question.

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