[Python.NET] How to create an instance of C# from pythonnet?

[Seungweon Park]

Thank you for the replies.

Now, I recompiled Python.Net with .Net 4.0 and get below working with
simple AAA.BBB.Adapter after reading

http://stackoverflow.com/questions/14520888/clr-addreferenceexample-file-unable-to-find-assembly?rq=1
http://stackoverflow.com/questions/13259617/python-for-net-unable-to-find-assembly-error?rq=1
http://sourceforge.net/p/pythonnet/bugs/17/
http://sourceforge.net/p/pythonnet/bugs/18/


Now I have below sample code(Adapter.proj has two c# files), and
experimented

Class1.cs
-----------
namespace AAA.BBB.CCC
{

    public class Adapter
    {
        public string Function1()
        {
            return "AAA.BBB.CCC: Adapter Function1 Called";
        }
        public void Function2()
        {
            Console.WriteLine("AAA.BBB.CCC: Adapter Function2");
        }
    }

    public class Network
    {
        public string Function1()
        {
            return "AAA.BBB.CCC: Network Function1 called";
        }

        public void Function2()
        {
            Console.WriteLine("AAA.BBB.CCC: Network Function2");
        }
    }
}

namespace AAA.BBB
{
    public class Adapter
    {
        public string Function1()
        {
            return "AAA.BBB: Adapter Function1 Called";
        }
        public void Function2()
        {
            Console.WriteLine("AAA.BBB: Adapter Function2");
        }
    }

    public class Network
    {
        public string Function1()
        {
            return "AAA.BBB: Network Function1 called";
        }

        public void Function2()
        {
            Console.WriteLine("AAA.BBB: Network Function2");
        }
    }

}

Class2.cs
-----------
namespace AAA.CCC
{
    public class Adapter
    {
        public string Function1()
        {
            return "AAA.CCC: Adapter Function1 Called";
        }
        public void Function2()
        {
            Console.WriteLine("AAA.CCC: Adapter Function2");
        }
    }
}

Then, I got below. It seems working great.

C:\Automation\PythonNet>nPython.exe
Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path.append("c:\\automation\\pythonnet")
>>> import clr
>>> clr.FindAssembly("Adapter")
u'Adapter.dll'
>>> clr.AddReference("Adapter")
<System.Reflection.RuntimeAssembly object at 0x052E5828>
>>> adapter1 = Adapter()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'Adapter' is not defined
>>> from AAA.BBB.CCC import Adapter
>>> from AAA.BBB.CCC import *
>>> adapter1 = Adapter()
>>> adapter1.Function1()
u'AAA.BBB.CCC: Adapter Function1 Called'
>>> adapter1.Function2()
AAA.BBB.CCC: Adapter Function2
>>> network1 = Network()
>>> network1.Function1()
u'AAA.BBB.CCC: Network Function1 called'
>>> from AAA.CCC import *
>>> adapter1.Function1()
u'AAA.BBB.CCC: Adapter Function1 Called'
>>> adapter1 = Adapter()
>>> adapter1.Function1()
u'AAA.CCC: Adapter Function1 Called'
>>>

My questions are

1. I don't know how to specify different namespace of class when creating
an instance.
2. The class that I already have has similar above layout in a project.
Common project has many class files in it, and each class has different
name space and class name.
AddReference('Common') looks working and loaded, but can't import.

>>> clr.AddReference('Common')
<System.Reflection.RuntimeAssembly object at 0x052E73C8>
>>> from Network import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named Network
>>> from Network.Common import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named Network.Common
>>>

Difference is that Common project has [Serializable] and enabled "Make
assembly COM-Visible"

    [Serializable]
    [Description("SimpleDictionary")]
    public class SimpleDictionary : ISimpleDictionary
    {
    ...
    }

Any thoughts?
Wonder if there is a way to list available class after AddReference().

Thanks,
Spark.



On Thu, Apr 18, 2013 at 9:14 PM, Stephen P. Lepisto <stephenp at otakuworld.com
> wrote:

>  Try this from python with pythonNet installed (the current directory is
> assumed to contain Adapter.dll):
>
> import clr
> clr.AddReference("Adapter")        # Load the Adapter.dll
> from AAA.BBB import Adapter    # Get the Adapter class type
> adapter = Adapter()   # Create instance of the Adapter class
> adapter.GetSpeed()    # Call the method
>
>
>
> On 4/18/2013 3:42 PM, Seungweon Park wrote:
>
> Thank you for the reply.
>
>  I did
>
>  >>> import clr
> >>> from System.Reflection import Assembly
> >>> Assembly.LoadWithPartialName("Adapter")
> <System.Reflection.RuntimeAssembly object at 0x05381148>
> >>> from AAA.BBB import Adapter
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named AAA.BBB
>
>  I don't know why I got this. :-(
> Any idea?
>
>
>
> On Thu, Apr 18, 2013 at 3:07 PM, msutton <msutton at ucsd.edu> wrote:
>
>>  What I use is:
>>
>> import clr
>> from System.Reflection import Assembly
>> Assembly.LoadWithPartialName('Demo')
>> from Render import Demo
>>
>> where the C# code has namespace Render and public class Demo.
>>
>> -Manuel
>>
>>
>> On 04/18/2013 02:45 PM, Seungweon Park wrote:
>>
>>  Hi,
>>
>>  I have Adapter.dll with namespace 'AAA.BBB.Adapter" written in C# which
>> gives network adapter information.
>> I want to call one of method GetSpeed(). I don't know How to create an
>> instance in python.
>> Would you give me some clue for writing the same python code like below
>> powershell script using python.net
>> I don't see any sample code which python creates C# class instance.
>>
>>
>>  Python
>> ---------------------------
>>  C:\CVS\Pythonnet>npython
>> Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
>> on win32
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> import os,sys
>> >>>
>> sys.path.append("c:\\cvs\\powershelliteexample\\networktestlibrary\\iteextensions")
>> >>> sys.path
>> ['', 'C:\\Python27\\lib\\site-packages\\paramiko-1.10.0-py2.7.egg',
>> 'C:\\CVS\\Python\\libs', 'C:\\Windows\\system32\\pyt
>> hon27.zip', 'C:\\Python27\\Lib', 'C:\\Python27\\DLLs',
>> 'C:\\Python27\\Lib\\lib-tk', 'C:\\CVS\\Pythonnet', 'C:\\Python27'
>> , 'C:\\Python27\\lib\\site-packages',
>> 'C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319\\',
>> 'c:\\cvs\\powershelliteexam
>> ple\\networktestlibrary\\iteextensions']
>> >>> import clr
>> >>> clr.FindAssembly("Adapter")
>>
>> u'c:\\cvs\\powershelliteexample\\networktestlibrary\\iteextensions\\Adapter.dll'
>> >>> clr.AddReference("Adapter")
>> <System.Reflection.RuntimeAssembly object at 0x052028A0>
>>
>>  I don't know how to create an instance of Adapter.
>>
>>
>>  Thank you,
>> Spark.
>>
>>
>>  Powershell
>> ----------------------------
>> PS C:\CVS\PowershellITEExample> Import-Module .\LoadAdapter.psd1
>>  PS C:\CVS\PowershellITEExample> $adapter = New-object -type
>> "AAA.BBB.Adapter"
>> PS C:\CVS\PowershellITEExample> $ret = $adapter.GetAdapter("TestAdapter",
>> "oids.xml")
>> PS C:\CVS\PowershellITEExample> $ret.Passed
>> True
>> PS C:\CVS\PowershellITEExample> $baseAdapter = $ret.FunctionReturnValue
>> PS C:\CVS\PowershellITEExample> $baseAdapter.GetSpeed()
>>
>>  Passed              : True
>> Failed              : False
>> Errored             : False
>> Status              : Pass
>> Description         : Speed retrieved successfully.
>> FunctionReturnValue : auto
>>
>>
>>  _________________________________________________
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>>
>>
>>
>
>
> _________________________________________________
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>
>
> --
> Stephen P. Lepisto
>
>
> _________________________________________________
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