Can not add reference to .NET assembly in IronPython console in m11

[ziemiowid]

Hi,
I used to write my small addins to MapGuide Maestro in F#.
In m10 I am able to load compiled assembly within IronPython console with

clr.AddReference("MyPlugin")
import MyNamespace

MyCommand()

But now, in m11, this simple code provokes error:

IronPython 2.7.11 (2.7.11.1000)
[.NETCoreApp,Version=v3.1 on .NET 6.0.7 (64-bit)]
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> import clr
>>> sys.path.append(r"d:\PATH\TO\MyPlugin")
>>> clr.AddReference("MyPlugin")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: System.IO.IOException: Could not add reference to assembly MyPlugin
   at IronPython.Runtime.ClrModule.AddReference(CodeContext context, String name)
   at IronPython.Runtime.ClrModule.AddReference(CodeContext context, Object reference)
   at IronPython.Runtime.ClrModule.AddReference(CodeContext context, Object[] references)
   at Microsoft.Scripting.Interpreter.ActionCallInstruction`2.Run(InterpretedFrame frame)
   at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at Microsoft.Scripting.Interpreter.LightLambda.Run4[T0,T1,T2,T3,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3)
   at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
   at Microsoft.Scripting.Interpreter.FuncCallInstruction`6.Run(InterpretedFrame frame)
   at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at Microsoft.Scripting.Interpreter.LightLambda.Run4[T0,T1,T2,T3,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3)
   at IronPython.Compiler.Ast.CallExpression.Invoke1Instruction.Run(InterpretedFrame frame)
   at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet](T0 arg0, T1 arg1)
   at IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx)
   at IronPython.Compiler.PythonScriptCode.Run(Scope scope)
   at IronPython.Hosting.PythonCommandLine.<>c__DisplayClass27_0.<RunOneInteraction>b__0()

Trying to solve this problem, I found entry in Windows Application Event Log:

Description: A .NET application failed.
Application: Maestro.exe
Path: C:\Program Files\MapGuide Maestro 6.0m11\Maestro.exe
Message: Cannot use file stream for [C:\Program Files\MapGuide Maestro 6.0m11\Maestro.deps.json]: No such file or directory

This suggests that there may be issues with Maestro configuration as self-contained .NET application.

--
Best regards
Rick

[jumpinjackie]

Could you post a hypothetical minimal "hello world" F# example that your IronPython snippet would've loaded in the past and how such an example would be built (sorry, I don't use F#) and I'll investigate.

[ziemiowid]

I think my information about F# was unnecessary. I wanted simply to tell that I use IronPython to load compiled .NET assemblies. You can build any basic, minimal C# example to reproduce this behavior. I reproduced this error with following code:

namespace ClassLibrary1
{
    public class Class1
    {
        public void Start()
        {
            int dummy = 0;
        }
    }
}

It's not problem with code within plugin, but with referencing it from IronPython.

By the way it is possible to load this assembly using clr.LoadAssemblyFromFile:

>>> tp  = clr.LoadAssemblyFromFile("ClassLibrary1.dll")
>>> print tp
ClassLibrary1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
>>> c1 = tp.ClassLibrary1.Class1()
>>> c1.Start()
>>> 

but real code with additional dependencies throws runtime errors.