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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Passing Python objects implementing a generic C# interface to a C# method fails in 3.0.0","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 2.5.2 and 3.0.0.post01\r\n-   Python version: 3.7.6 (2.5.2) and 3.9.12 (3.0.0.post01)\r\n-   Operating System: Win10\r\n-   .NET Runtime: .NET 6\r\n\r\n### Details\r\n\r\nPassing a Python object (`obj`) that implements a generic interface in Python (`ISome`) to a C# class _fails_ in pythonnet 3.0 but _works_ in 2.5.2; same behaviour whether specific (`SomeSpecific`) or generic (`SomeGeneric`)\r\n\r\n\r\n-   What commands did you run to trigger this issue? If you can provide a\r\n    [Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve)\r\n    this will help us understand the issue.\r\n\r\n```csharp\r\nnamespace Some.Namespace\r\n{\r\n\r\n   public interface ISome\u003cT1\u003e\r\n   {\r\n       public T1 Get1(T1 x);\r\n   }\r\n\r\n   public class SomeSpecific\r\n   {\r\n       public SomeSpecific(ISome\u003cint\u003e some, int x)\r\n       {\r\n           Console.Out.WriteLine($\"Spec1 = {some.Get1(x)}\");\r\n       }\r\n   }\r\n\r\n   public class SomeGeneric\u003cT1\u003e\r\n   {\r\n       public SomeGeneric(ISome\u003cT1\u003e some, T1 x)\r\n       {\r\n           Console.Out.WriteLine($\"Gen1 = {some.Get1(x)}\");\r\n       }\r\n   }\r\n}\r\n```\r\n\r\n\r\n```python\r\nfrom Some.Namespace import ISome, SomeGeneric, SomeSpecific\r\n\r\nclass PySome(ISome[int]):\r\n   __namespace__ = 'Some.Namespace'\r\n\r\n   def Get1(self, x):\r\n       return x\r\n\r\nobj = PySome()\r\nprint(obj.Get1(4))\r\n# Next two lines fail in 3.0.0\r\nSomeSpecific(obj, 4)\r\nSomeGeneric[int](obj, 4)\r\n```\r\n\r\n-   If there was a crash, please include the traceback here.\r\n\r\n```python\r\nTraceback (most recent call last):\r\n   SomeSpecific(obj, 4)\r\nSystem.ArgumentException: Cannot resolve method Int32 Get1(Int32) because the declaring type of the method handle Some.Namespace.ISome`1[T1] is generic. Explicitly provide the declaring type to GetMethodFromHandle.\r\n  at System.Reflection.MethodBase.GetMethodFromHandle(RuntimeMethodHandle handle)\r\n  at Python.Runtime.PythonDerivedType.MarshalByRefsBack(Object[] args, RuntimeMethodHandle methodHandle, PyObject pyResult, Int32 outsOffset) in /tmp/build-via-sdist-rlpexh5w/pythonnet-3.0.0.post1/src/runtime/Types/ClassDerived.cs:line 844\r\n  at Python.Runtime.PythonDerivedType.InvokeMethod[T](IPythonDerivedType obj, String methodName, String origMethodName, Object[] args, RuntimeMethodHandle methodHandle) in /tmp/build-via-sdist-rlpexh5w/pythonnet-3.0.0.post1/src/runtime/Types/ClassDerived.cs:line 727\r\n  at Some.Namespace.PySome.Get1(Int32 )\r\n  at Some.Namespace.SomeSpecific..ctor(ISome`1 some, Int32 x) in\r\n```\r\n","author":{"url":"https://github.com/fractus","@type":"Person","name":"fractus"},"datePublished":"2022-10-21T14:33:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/1982/pythonnet/issues/1982"}