Ironpython cannot load C# DLL

[Petri]

Hi,

My company uses .NET and has libraries to interact with GUI. I would like to convince my team to use Robotframework for test scripts.

I try to create a POC for this reason, which loads the dll's needed and runs a test script. A prerequisite is that I can load .NET DLL that interacts with GUI library.

But I am stuck here, Ironpython cannot load one of the dependent DLL's or it's dependency.

Here is my Ironpython script:

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import clr

import sys

sys.path.append('D:\\tfs\\sandbox\\calculatordemo\\calculatordemo\\_Dependencies')

from exceptions import SystemError, Exception

import System

import System.Reflection

clr.AddReference('Components')

from System.Reflection import ReflectionTypeLoadException

try:

  from Components import Calculator

  calculator = Calculator()

  calculator.Start()

  print Calculator.Ready()

except  System.Reflection.ReflectionTypeLoadException as e2:

  print e2.LoaderExceptions[0]

except Exception  as e2:

  print('Exception occurred: ' + e2.message)

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Output:

System.IO.FileNotFoundException: Could not load file or assembly 'Blaa.Blaa.Testing.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=bd317adc1d7d9856' or one of its dependencies. The system cannot find the file specified.

File name: 'Blaa.Blaa.Testing.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=bd317adc1d7d9856'

=== Pre-bind state information ===

LOG: DisplayName = Blaa.Blaa.Testing.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=bd317adc1d7d9856

 (Fully-specified)

LOG: Appbase = file:///C:/Program Files (x86)/IronPython 2.7/

LOG: Initial PrivatePath = NULL

Calling assembly : (Unknown).

===

LOG: This bind starts in default load context.

LOG: Using application configuration file: C:\Program Files (x86)\IronPython 2.7\ipy64.exe.Config

LOG: Using host configuration file: 

LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\v4.0.30319\config\machine.config.

LOG: Post-policy reference: Blaa.Blaa.Testing.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=bd317adc1d7d9856

LOG: The same bind was seen before, and was failed with hr = 0x80070002.

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All dependencies should be in _Dependencies-folder. Similar script created as C# project works. IL Spy does not show any dependencies that should not be available.

Thanks for any help in helping to solve this! I did not yet find any help after several days of studies.

[Petri]

I figured this out. DLLs to be discovered must be mentioned in Ipy64.exe.config.

I added assembly binding element:

           <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

      <probing privatePath="DLLs\_Dependencies"/>

</assemblyBinding>

Also copied _Dependencies folder to C:\Program Files (x86)\IronPython 2.7\DLLs

Some other config file would be better, but for now this works.