[Python.NET] Python for .NET load .dll

Brian Lloyd brian.d.lloyd at gmail.com
Mon Jun 8 17:10:42 CEST 2015

You probably need to escape those backslashes, no? e.g.

'C:\\Program Files\\API\\Test.NET'

On Mon, Jun 8, 2015 at 3:44 AM, Gianni Iannelli <giannicristian at msn.com>

> Dear All,
> I have a problem loading an external dll using Python through Python for
> .NET. I have tried different methodologis following stackoverflow and
> similar. I will try to summarize the situation and to describe all the
> steps that I've done.
> I have a dll named for e.g. Test.NET.dll. I checked with dotPeek and I can
> see, clicking on it, x64 and .NET Framework v4.5. On my computer I have
> installed the .Net Framework 4.
> I have also installed Python for .NET in different ways. I think that the
> best one is download the .whl from this website
> http://www.lfd.uci.edu/~gohlke/pythonlibs/#pythonnet . I have downloaded
> and installed: pythonnet‑2.0.0.dev1‑cp27‑none‑win_amd64.whl. I can imagine
> that it will works for .NET 4.0 since*Requires the Microsoft .NET
> Framework 4.0.*
> Once I have installed everything, I can do these commands:
> >>> import clr>>> import System>>> print System.Environmnet.Version>>> print System.Environment.Version4.0.30319.34209
> It seems work. Then, I have tried to load my dll typing these commands:
> >>> import clr>>> dllpath= r'C:\Program Files\API\Test.NET'>>> clr.AddReference(dllpath)
> Traceback (most recent call last):
>   File "<pyshell#20>", line 1, in <module>
>     clr.AddReference(dllpath)FileNotFoundException: Unable to find assembly 'C:\Program Files\API\Test.NET'.
>    at Python.Runtime.CLRModule.AddReference(String name)
> I have also tried to add '.dll' at the end of the path but nothing
> changed. Then, I have also tried different solutions as described in:
>    -
>    http://stackoverflow.com/questions/14633695/how-to-install-python-for-net-on-windows
>    ,
>    -
>    http://stackoverflow.com/questions/13259617/python-for-net-unable-to-find-assembly-error
>    - https://github.com/geographika/PythonDotNet
> and much more.... Unfortunately, it doesn't work and I get different
> errors. I know that exists IronPython but I was trying to avoid to use it.
> Thanks for your help!
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