Is there a way to constract a derived class that hides certain public members of a base class ?
With the following code, a class that derives from DerivedClass can still see the member "Name" in the base class. Can anyone provide me with an example that will do what I need?

Public Class BaseClass
    Private mName As String = "Bob"
    Public Overridable Function Name() As String
        Name = mName
    End Function
End Class

Public Class DerivedClass : Inherits BaseClass
    Private Shadows Function Name() As String
        Name = "Joe"
    End Function
End Class


--------------------------------
Thanks,
Paul Wu

Paul,

No you can't. You will see this behaviour as well in some of the standard controls who derive from control. Some members do just nothing.

I hope this helps anyhow,

Cor

Classes will always have the methods and properties they were created with. You cannot hide these from code but you can hide them from the eyes of your users if you know what you're doing.

In the case of a class that is examined at design-time by the property grid you can hide classes by creating a designer for your class and overriding the PreFilterProperties or PostFilterProperties methods. These take the list of properties obtained by reflection and remove enable you to add or rmove property descriptors. This is how the Browsable attribute works to enable certain properties to be visible at design time.

The trick of overriding the class and marking a property as browseable or not is also a possibility for design-time usage but is IMO not quite so desirable.

If you're code presents properties in some other way at runtime, perhaps through the property grid or some other form of reflection, you can make your class implement ICustomTypeDescriptor. This interface enables you to preemptively filter properties and can be used at runtime without a designer.

  Is there a way to constract a derived class that hides certain public members of a base class ?
  With the following code, a class that derives from DerivedClass can still see the member "Name" in the base class. Can anyone provide me with an example that will do what I need?

  Public Class BaseClass
      Private mName As String = "Bob"
      Public Overridable Function Name() As String
          Name = mName
      End Function
  End Class

  Public Class DerivedClass : Inherits BaseClass
      Private Shadows Function Name() As String
          Name = "Joe"
      End Function
  End Class


  --------------------------------
  Thanks,
  Paul Wu

Bob,

I wrote this in a way like you as well and deleted that again, because it is
for somebody who create classes in my opinion not interesting.

The chalenge is in my opinon to let the members never (directly) been showed
in a derived class . (With directly I mean without casting).

When you have a solution for that, than I will be glad when you can show
that and do I probably miss something.

Cor

The only sensible way to do what you're suggesting is to use the memento
pattern...

Otherwise, the suggestions I made are the only possible alternatives.

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