How do I Implements Parent class interface in child class

[owais]

Hi,

I have a problem, I want to implements Parent class interface methods in child class. for e.g

-------------- Test1.vb ----------------
Imports System
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Globalization

Public Class Test1
Inherits RadioButton
Implements IPostBackDataHandler

Public Function LoadPostData(ByVal postDataKey As String, ByVal postCollection As System.Collections.Specialized.NameValueCollection) As Boolean Implements System.Web.UI.IPostBackDataHandler.LoadPostData

End Function

Public Sub RaisePostDataChangedEvent() Implements System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent

End Sub
End Class

-------------------------------------------------

when i compiling this class it gives me error

" Interface 'System.Web.UI.IPostBackDataHandler' is already implemented by base class 'System.Web.UI.WebControls.RadioButton'."

Please help me in this regard

Thanks
Owais

 

[Maqsood Ahmed]

Hello,
This is because RadioButton inherits from CheckBox which in turn
implements IPostBackDataHandler interface. It means that your control's
base class already implements the interface and you can not overwrite
its implementation.

Cheers
Maqsood Ahmed [MCP,C#]
Kolachi Advanced Technologies
http://www.kolachi.net

 

[owais]

Thanks for the reply, yes i know it is
but i don't understand in C# it work

Owais

 

[Francois Bonin [C# MVP]]

It depends in which way you implement it.
You can have two implementation of the same interface function if one of
them is an explicit interface implementation.