SerializationException when PythonEngine.Shutdown()

[muler415]

Environment

• Pythonnet version: 3.0.1
• Python version: 3.8
• Operating System: win11
• .NET Runtime: 4.6.1

Details

• Describe what you were trying to get done.

  my python code listed as following:

import datetime
import csv
import clr
clr.AddReference('CyberStone.Atp.Storage')
from CyberStone.Atp.Storage.Query import QueryCondition
from CyberStone.Atp.Modules.Analysis.Models import SearchResModel
from System.Collections.Generic import List
from System import String, DateTime

#define query condition
condition = QueryCondition()
condition.QueryValueVariables = List[String]()
condition.QueryValueVariables.Add('Decoder/projectValue')
condition.RowMax = 100
condition.StartTime = DateTime(2018, 8, 2)
condition.EndTime = DateTime(2018, 8, 3)

#start query database
result = dataAnalysis.GetSearchDataSet(condition)
print(result.Count) 

when I execute PythonEngine.Shutdown(), there is exception. do you know how to resolve it?

System.Runtime.Serialization.SerializationException
HResult=0x8013150C
Message=程序集“CyberStone.Atp.Modules.Analysis, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null”中的类型“CyberStone.Atp.Modules.Analysis.Models.SearchResModel”未标记为可序列化。
Source=mscorlib
StackTrace:
at System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type)
at System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory)
at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context)
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo()
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Type objectType, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, SerializationBinder binder)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.WriteArray(WriteObjectInfo objectInfo, NameInfo memberNameInfo, WriteObjectInfo memberObjectInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph)
at Python.Runtime.RuntimeData.Stash()
at Python.Runtime.Runtime.Shutdown()
at Python.Runtime.PythonEngine.Shutdown()
at CyberStone.Atp.Infrastructure.Python.PythonNetScriptRunner.Run(String scripttext, PythonNetScope userscope) in D:\repo\ATP56\CSharp\Base\CyberStone.Atp.Infrastructure\PythonNet\PythonNetScriptRunner.cs:line 211
at CyberStone.Atp.Modules.TestScript.PythonNet.ViewModels.PythonNetDocument.<>c__DisplayClass25_0.b__0() in D:\repo\ATP56\CSharp\Modules\CyberStone.Atp.Modules.TestScript\PythonNet\ViewModels\PythonNetDocument.cs:line 220
at System.Threading.Tasks.Task.Execute()

            PythonEngine.Initialize();
            try
            {
                using (PythonRuntime.Py.GIL())
                {
                    // Capture the output in a StringWriter
                    using (var outputWriter = new StringWriter())
                    {
                        // Redirect Python's sys.stdout to the custom StringWriter
                        var originalOutput = Console.Out;
                        Console.SetOut(outputWriter);

                        dynamic sys = Py.Import("sys");
                        dynamic pythonIO = Py.Import("io");

                        // Redirect Python's sys.stdout to a custom StringIO object
                        dynamic originalStdout = sys.stdout;
                        dynamic captureStream = pythonIO.StringIO();
                        sys.stdout = captureStream;

                        try
                        {
                            PyObject p = PythonEngine.Compile(_scripttext);

                            _scope.CreatePythonNetScope();
                            _scope.Scope.Exec(_scripttext);
                            //PythonRuntime.PythonEngine.Exec(_scripttext);
                        }
                        catch (Exception ex)
                        {
                            capturedOutput += $"{ex.Message};";
                        }
                        finally
                        {
                            // Reset sys.stdout to the original value
                            sys.stdout = originalStdout;
                        }

                        // Get the captured output from the StringIO object
                        capturedOutput += captureStream.getvalue().ToString();
                    }
                }
            }
            catch(Exception ex)
            {
            }
            finally
            {
                PythonEngine.Shutdown();
            }

• 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.

    print('TODO')

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

    print('TODO')

[wrexbe]

When my application is exiting to work around the bug I do this.

typeof(Runtime)
.GetField("ProcessIsTerminating", BindingFlags.Static | BindingFlags.NonPublic )!
.SetValue(null, true);
PythonEngine.Shutdown();

I do not recommend this as a workaround if you plan on starting it up again.

[muler415]

I used other options to resolve this issue by recreating new class for serialization purpose. this works well in my application.