[Python.NET] "Incorrect" behavior of inheriting from class which is inherited from .Net class

[Denis Akhiyarov]

Ok, do you agree to MIT license for your code? I may use some of your code
to contribute to WPF demo.

https://github.com/pythonnet/pythonnet/pull/185



On Thu, Aug 25, 2016 at 10:44 AM, Hansong Huang <hhspiny at pine.cc> wrote:

> Hi Denis,
>
>
> There is no licenses term.  I simply used github to save files to work on
> between home and work.  it is free to use by anyone.
>
>
> Since the current pythonnet does not really allow derive from class
> derived from .NET class. I can't really do what I intended to do, and
> therefore, I have not spent time on it further. I don't know much about
> the internal of python to contribute to correct the problem.
>
>
> The framework currently in github does work fine using ExpandoObject class
> directly. so it would be ok to be used for simpler program.
>
>
> Regards,
>
>
> Hansong
> ------------------------------
> *From:* Denis Akhiyarov <denis.akhiyarov at gmail.com>
> *Sent:* Thursday, August 25, 2016 11:15:37 AM
> *To:* A list for users and developers of Python for .NET
> *Cc:* hhspiny at pine.cc
> *Subject:* Re: [Python.NET] "Incorrect" behavior of inheriting from class
> which is inherited from .Net class
>
> *Hi Hansong, *
>
> I noticed that you (@hhspiny) released your WPF adventures with pythonnet
> on github, but without a license:
>
> https://github.com/hhspiny/WPFPy
>
> Can you please indicate the license?
>
> *Hi Tony,*
>
> Please let me know how this subclassing (.NET -> Python -> Python) would
> work?
>
> *Thanks,*
> *Denis*
>
> On Mon, Apr 11, 2016 at 2:04 AM, Tony Roberts <tony at pyxll.com> wrote:
>
>> Hi,
>>
>> yes, deriving from a python class in Python that itself is derived from a
>> .net class doesn't work. Apologies, if I'd known that was what you were
>> doing I could have saved you some time by telling you that earlier.
>>
>> AFAIK this hasn't been created as an issue in github, so please if you
>> could do that that would be helpful. It's probably not that hard to make
>> work, but it's not something I've got time to look at myself right now I'm
>> afraid. If anyone else wants to have a go and needs pointing in the right
>> direction let me know.
>>
>> Tony
>> On Mon, Apr 11, 2016 at 3:41 AM Hansong Huang <hhspiny at live.com> wrote:
>>
>>> Hello,
>>>
>>> This is related to previous investigation of inheriting from .NET
>>> interface class to create WPF MVVM structure.  As now I believe it has
>>> nothing to do with interface class, but instead caused by inheriting from
>>> .Net class overall.
>>>
>>> please see the following code
>>>
>>> import clr, System
>>> class baseNA(System.Random):
>>>     __namespace__ = "BaseNA"
>>>     def __init__(self):
>>>         super(baseNA,self).__init__()
>>> #    @clr.clrmethod(System.String,[])
>>>     def ToString(self):
>>>         return "string"
>>>
>>> class baseNB(baseNA):
>>>     __namespace__ = "BaseNB"
>>>     def __init__(self):
>>>         super(baseNB,self).__init__()
>>> bna = baseNA()
>>> print bna.ToString()
>>> print bna._Random__ToString()
>>> bnb = baseNB()
>>> print bnb.ToString()
>>> print bnb._baseNA__ToString()
>>> print bnb._Random__ToString()
>>>
>>>
>>> This produces the following output
>>> string
>>> BaseNA.baseNA
>>> BaseNB.baseNB
>>> BaseNB.baseNB
>>> BaseNB.baseNB
>>>
>>> as you see, while baseNA -- the first level inherited class works fine.
>>> ToString() overrides System.Random.ToString()
>>>
>>> But baseNB inherited from baseNA did not inherit ToString() method from
>>> baseNA, but rather inherited from System.Random.
>>>
>>> Not sure if it is a bug in python.net or was intended.
>>>
>>> regards,
>>>
>>> Hansong
>>>
>>>
>>>
>>>
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>>
>>
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>
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