Class Declaration Problem with Inherits and Implements

[Chris Lane]

Hi,

I have the following class declaration and the ide is giving the following
errors.

Interface 'System.Web.UI. IPostBackDataHa ndler' is already implemented by
base class 'System.Web.UI. HtmlControls.Ht mlInputRadioBut ton'.

'System.Web.UI. IPostBackDataHa ndler.LoadPostD ata' is already implemented by
base class 'System.Web.UI. HtmlControls.Ht mlInputRadioBut ton' and cannot be
implemented again.

Public Class ParticipantRadi oButton
Inherits System.Web.UI.H tmlControls.Htm lInputRadioButt on
Implements IPostBackDataHa ndler
Private Function LoadPostData(By Val postDataKey As String, _
ByVal postCollection As NameValueCollec tion) As Boolean
Implements IPostBackDataHa ndler.LoadPostD ata

End Function

[Chris Lane]

I can't believe nobody knows how to do this. Anyhelp is appreciated.

[Chris Dunaway]

It's telling you that the base class already implements the interface.
There is no need for you to do it again.

[Chris Lane]

Why does C# allow you Implement an Interface that the Inherited class is
already implementing and VB.Net does not?

This pisses me of there has to be another way to do this by using a generic
control or something .

[Jay B. Harlow [MVP - Outlook]]

Chris,
VB.NET 2002 & 2003 (.NET 1.0 & 1.1) does not allow a derived class to
implement the same interface as a base class (although corresponding
versions of C# does, remember VB.NET is not C#, nor is C# VB.NET)...

I'm not certain as to the reason for the restriction...

My understanding is that VB 2005 (.NET 2.0) will allow a derived class to
implement the same interface as a base class. Unfortunately I don't have a
reference handy, nor my VPC handy to verify...

Hope this helps
Jay

"Chris Lane" <Ch*******@disc ussions.microso ft.com> wrote in message
news:BE******** *************** ***********@mic rosoft.com...
| Hi,
|
| I have the following class declaration and the ide is giving the following
| errors.
|
| Interface 'System.Web.UI. IPostBackDataHa ndler' is already implemented by
| base class 'System.Web.UI. HtmlControls.Ht mlInputRadioBut ton'.
|
| 'System.Web.UI. IPostBackDataHa ndler.LoadPostD ata' is already implemented
by
| base class 'System.Web.UI. HtmlControls.Ht mlInputRadioBut ton' and cannot be
| implemented again.
|
| Public Class ParticipantRadi oButton
| Inherits System.Web.UI.H tmlControls.Htm lInputRadioButt on
| Implements IPostBackDataHa ndler
|
|
| Private Function LoadPostData(By Val postDataKey As String, _
| ByVal postCollection As NameValueCollec tion) As Boolean
| Implements IPostBackDataHa ndler.LoadPostD ata
|
| End Function
|
|
|

[Chris Lane]

I know that but C# lets you do it so you can implement your own version of
the interfaces method.

HtmlInputRadioB utton.IPostBack DataHandler.Loa dPostData MethodSee Also
HtmlInputRadioB utton Class | HtmlInputRadioB utton Members |
System.Web.UI.H tmlControls Namespace | Managed Extensions for C++ Programming
Language
C#

C++

JScript

Visual Basic

Show All
This member supports the .NET Framework infrastructure and is not intended
to be used directly from your code.

[Visual Basic]
Private Function LoadPostData( _
ByVal postDataKey As String, _
ByVal postCollection As NameValueCollec tion _
) As Boolean Implements IPostBackDataHa ndler.LoadPostD ata

[C#]
bool IPostBackDataHa ndler.LoadPostD ata(
string postDataKey,
NameValueCollec tion postCollection
);

It's private for
"Chris Dunaway" wrote:

It's telling you that the base class already implements the interface.
There is no need for you to do it again.

[Herfried K. Wagner [MVP]]

Jay,

"Jay B. Harlow [MVP - Outlook]" <Ja************ @tsbradley.net> schrieb:

My understanding is that VB 2005 (.NET 2.0) will allow a derived class to
implement the same interface as a base class. Unfortunately I don't have a
reference handy, nor my VPC handy to verify...

Yes, VB 2005 (August CTP) allows interface re-implementation.

\\\
Public Interface IGoo
Sub Bla()
End Interface

Public Class Bar
Implements IGoo

Public Sub Bla() Implements IGoo.Bla
'
End Sub
End Class

Public Class FooBar
Inherits Bar
Implements IGoo

Public Overloads Sub Bla() Implements IGoo.Bla
'
End Sub
End Class
///

There will be a warning given on 'Implements IGoo.Bar' of class 'FooBar'
("Warning: 'IGoo.Bla' is already implemented by the base class 'Bar'.
Re-implementation of sub assumed").

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Chris Lane]

Thanks, Jay and Herfried. I guess I am SOL unless I use C# to do this for now.