René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Managed exception from Python code is always transformed to PythonException","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 3.0.0 preview\r\n-   Python version: 3.8 win32\r\n-   Operating System: Windows\r\n-   .NET Runtime: .NET 5\r\n\r\n### Summary\r\n\r\nIf there is a callback from .NET to Python, and the Python code raises a .NET type exception, instead of the corresponding real .NET exception was rethrown on the .NET side (after marshalling), always `Python.Runtime.PythonException` is thrown.\r\n\r\n### Details\r\n\r\n.NET snippet\r\n```C#\r\nclass Foo\r\n{\r\n    public static void Bar(Action action)\r\n    {\r\n        try\r\n        {\r\n            action.Invoke();\r\n            Console.WriteLine(\"No exception.\");\r\n        }\r\n        catch (NullReferenceException)\r\n        {\r\n            Console.WriteLine(\"Null reference caught.\");\r\n        }\r\n        catch (Exception ex)\r\n        {\r\n             Console.WriteLine(\"General exception caught: \" + ex.GetType().Type); \r\n        }\r\n    }\r\n}\r\n```\r\n\r\nPython snippet\r\n```Python\r\n# .NET imports\r\nfrom System import NullReferenceException, Action\r\nfrom MyProgram import Foo\r\n\r\n# Preparation\r\ndef call():\r\n    raise NullReferenceException()\r\n\r\naction = Action(call)\r\n\r\n# Action\r\nFoo.Bar(action)\r\n```\r\n\r\nExpected output:\r\n`Null reference caught.`\r\n\r\nActual output:\r\n`General exception caught: Python.Runtime.PythonException`","author":{"url":"https://github.com/tibortakacs","@type":"Person","name":"tibortakacs"},"datePublished":"2021-04-16T19:14:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/1443/pythonnet/issues/1443"}