System.TypeInitializationException with pythonnet3.0.0.dev1 calling .NET Core 3.1 lib

[Seb394]

Environment

• Pythonnet version: pythonnet3.0.0.dev1 (master branch 10th March 2021)
• Python version: 3.5.9
• Operating System: Linux Ubuntu 18.04 LTS
• .NET Runtime: .NET Core 3.1

Details

• Describe what you were trying to get done.

  I tried to call methods within a C# lib build on .NET Core 3.1 from python using pythonnet.
  Therefore i downloaded source code from master branch, built and installed pythonnet by myself.

Before i had the same C# lib on .NET Framework4.5 and using pythonnet 2.4.0-dev1 which ran without problems.

Any ideas?

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

    import clr
    import os
   
    cwd = os.getcwd()

    clr.AddReference(cwd + '/LibraryName.dll')

    # Create library instance failes !
    test = LinuxCanOpenInstrument()

    ....

• If there was a crash, please include the traceback here.

    /usr/bin/python3.6 /home/dev-flash/projects/IF_Lib_DotNetCore3.1/InstrumentFunctionsLib/bin/Release/netcoreapp3.1/TestDotNetDll.py
System.TypeLoadException: Could not load type of field 'InstrumentFunctions.CanOpenCommunication:m_sendTimer' (16) due to: Could not resolve type with token 01000028 from typeref (expected class 'System.Timers.Timer' in assembly 'System.ComponentModel.TypeConverter, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a') assembly:System.ComponentModel.TypeConverter, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a type:System.Timers.Timer member:(null)
  at InstrumentFunctions.LibraryManager..cctor () [0x00020] in <884d81b1dc3b490db2f5701632383726>:0 

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/dev-flash/projects/IF_Lib_DotNetCore3.1/InstrumentFunctionsLib/bin/Release/netcoreapp3.1/TestDotNetDll.py", line 22, in <module>
    test = LinuxCanOpenInstrument()
System.TypeInitializationException: The type initializer for 'InstrumentFunctions.LibraryManager' threw an exception. ---> System.TypeLoadException: Could not load type of field 'InstrumentFunctions.CanOpenCommunication:m_sendTimer' (16) due to: Could not resolve type with token 01000028 from typeref (expected class 'System.Timers.Timer' in assembly 'System.ComponentModel.TypeConverter, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a') assembly:System.ComponentModel.TypeConverter, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a type:System.Timers.Timer member:(null)
  at InstrumentFunctions.LibraryManager..cctor () [0x00020] in <884d81b1dc3b490db2f5701632383726>:0 
   --- End of inner exception stack trace ---
  at InstrumentFunctions.LinuxCanOpenInstrument..ctor () [0x0027b] in <884d81b1dc3b490db2f5701632383726>:0 
  at (wrapper managed-to-native) System.Reflection.RuntimeConstructorInfo.InternalInvoke(System.Reflection.RuntimeConstructorInfo,object,object[],System.Exception&)
  at System.Reflection.RuntimeConstructorInfo.InternalInvoke (System.Object obj, System.Object[] parameters, System.Boolean wrapExceptions) [0x00005] in <533173d24dae460899d2b10975534bb0>:0 

Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)

[Seb394]

@filmor can you help here?

[filmor]

To load a .NET Core project, you'll have to initialise the runtime, check #984. We'll provide proper documentation as we get closer to a release.

[Seb394]

Runtime initialization doesn't solve my problem, still the same error message!

Code:

import clr_loader
import clr
import os
from pythonnet import set_runtime

rt = clr_loader.get_coreclr("/path/InstrumentFunctionsLib.runtimeconfig.json")
set_runtime(rt)

cwd = os.getcwd()

clr.AddReference(cwd + '/InstrumentFunctionsLib.dll')

# Create object of imported library
test = LinuxCanOpenInstrument()

[Seb394]

@filmor any other solution?

[mariusmuntean]

Happens to me as well. Is there any know fix for this?