[Mono-list] SPAM-LOW: Re: Inheriting from System.Windows.Forms.TextBox

[Ivan N. Zlatev]

On Thu, Nov 20, 2008 at 8:39 PM, Ivan N. Zlatev <contact at i-nz.net> wrote:
> On Thu, Nov 20, 2008 at 7:08 PM, Charlie Poole <charlie at nunit.com> wrote:
>> Hi
>>
>>> On Thu, Nov 20, 2008 at 4:47 PM, Jb Evain <jb at nurv.fr> wrote:
>>> > Hey,
>>> >
>>> > On 11/20/08, Jon Harrop <jon at ffconsultancy.com> wrote:
>>> >  >  Any ideas why?
>>> >
>>> > It looks like a F# compiler bug to me.
>>> >
>>>
>>> Just for info the the method is defined in the TextBoxBase:
>>>
>>>    internal abstract Color ChangeBackColor (Color backColor);
>>>
>>> and implemented in the TextBox class:
>>>
>>>    internal override Color ChangeBackColor (Color backColor) { ... }
>>
>> It also seems to be a design bug. What's the point of having
>> a public abstract class if it's written in such a way that you
>> can only extend it internally?
>>
>
> Hi,
>
> It's definitely not a design bug, but quite the opposite.
> TextBox(Base) is part of the Windows Forms API, which is part of the
> .NET Class Library, which we have to be API compatible with. However
> the public API covers only so much functionality and there is so much
> more that happens behind the scenes, which requires a lot of internal
> code implemented, which is implemented in a nice OO manner.
>

I completely forgot it's abstract, so in that case you are right and I
am wrong. :-)

-- 
Kind Regards,
Ivan N. Zlatev