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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"BinaryFormatter deprecation issue while using PythonEngine.Shutdown()","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 3.0.4\r\n-   Python version: 3.11\r\n-   Operating System: Windows 10\r\n-   .NET Runtime: .NET8/netstandard 2.0\r\n\r\n### Details\r\n\r\nHi, I am facing a known issue with PythonEngine.Shutdown() that should have been solved. I saw looking around here that many others have had a problem while using the Shutdown function since it caused an exception due to the deprecation of BinaryFormatter in .NET8. \r\nHere the exception I am getting:\r\n\r\nSystem.NotSupportedException: 'BinaryFormatter serialization and deserialization are disabled within this application. See https://aka.ms/binaryformatter for more information.'\r\n\r\nI am aware of the workarounds already provided such as the management of \"System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization\" parameter, if I manually manage this set the issue is not presenting anymore, but it seems to me that is more of a patch than a fix.\r\n\r\nSince .NET9 will totally get rid of BinaryFormatter, and since I read in other threads that this issue should have been fixed, I was wondering if I was missing something or if the only way to manage this is by manually managing the serialization parameter.\r\n\r\nHere follows the code I am using (in a project that targets netstandard2.0, while it is called by a .NET8 project). \r\n\r\n```csharp\r\nusing Python.Runtime;\r\nusing System;\r\nusing System.IO;\r\n\r\nnamespace ExecutePython\r\n{\r\n    public class Class1\r\n    {\r\n        string filePath;\r\n        \r\n        public Class1(string FilePath) \r\n        { \r\n            filePath = FilePath;\r\n            Initialize();\r\n        }\r\n\r\n        public void Initialize()\r\n        {\r\n            string pythonDll = @\"C:\\Users\\MyUser\\AppData\\Local\\Programs\\Python\\Python311\\python311.dll\";\r\n            Environment.SetEnvironmentVariable(\"PYTHONNET_PYDLL\", pythonDll);\r\n            PythonEngine.Initialize();\r\n        }\r\n        public void ExecutePython()\r\n        {\r\n            string pyCode = File.ReadAllText(filePath);\r\n\r\n            using (Py.GIL())\r\n            {\r\n                try\r\n                {\r\n                    PythonEngine.Exec(pyCode);\r\n                }\r\n                catch (Exception ex)\r\n                {\r\n                    //log error\r\n                }\r\n            }\r\n            \r\n            try\r\n            {\r\n                //AppContext.SetSwitch(\"System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization\", true);\r\n                PythonEngine.Shutdown();  \r\n                //AppContext.SetSwitch(\"System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization\", false);\r\n            }\r\n            catch (Exception e)\r\n            { }\r\n        }\r\n    }\r\n}\r\n```\r\n\r\nThe code that is executing correctly in my python script is a sample code, in my case it just pops up a window to see that the script is executing correctly","author":{"url":"https://github.com/Kaz8939","@type":"Person","name":"Kaz8939"},"datePublished":"2024-10-01T09:58:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/2469/pythonnet/issues/2469"}