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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Python.Runtime fails on .NET 4.5 and up","articleBody":"Currently library fails on .NET 4.5. I know that 4.5 is not technically supported but the issue very painful because .NET 4.5 is update in place which overrides CLR. So, having it installed I don't really have an option to run it on ver 4. \nWhen I try to run an application that uses Python for .NET i get exception\n\nSystem.ArgumentNullException was unhandled\n  HResult=-2147467261\n  Message=Value cannot be null.\nParameter name: key\n  Source=mscorlib\n  ParamName=key\n  StackTrace:\n       at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)\n       at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue\u0026 value)\n       at Python.Runtime.GenericUtil.Register(Type t) in D:\\Users\\Barton\\Documents\\Visual Studio 2010\\Projects\\PySharp\\trunk\\pythonnet\\src\\runtime\\genericutil.cs:line 41\n       at Python.Runtime.AssemblyManager.ScanAssembly(Assembly assembly) in D:\\Users\\Barton\\Documents\\Visual Studio 2010\\Projects\\PySharp\\trunk\\pythonnet\\src\\runtime\\assemblymanager.cs:line 266\n       at Python.Runtime.AssemblyManager.Initialize() in D:\\Users\\Barton\\Documents\\Visual Studio 2010\\Projects\\PySharp\\trunk\\pythonnet\\src\\runtime\\assemblymanager.cs:line 60\n       at Python.Runtime.Runtime.Initialize() in D:\\Users\\Barton\\Documents\\Visual Studio 2010\\Projects\\PySharp\\trunk\\pythonnet\\src\\runtime\\runtime.cs:line 166\n       at Python.Runtime.PythonEngine.Initialize() in D:\\Users\\Barton\\Documents\\Visual Studio 2010\\Projects\\PySharp\\trunk\\pythonnet\\src\\runtime\\pythonengine.cs:line 118\n       at Program.Program.main(String[] _arg1) in C:\\Users\\mitekm\\Documents\\Visual Studio 2013\\Projects\\TryPythonForNet\\TryPythonForNet\\Program.fs:line 54\n  InnerException: \n\nI did some extra investigation. What happens is that this line of code fails\n\nhttps://github.com/pythonnet/pythonnet/blob/develop/pythonnet/src/runtime/genericutil.cs#L41\n\nbecause Namespace property is null on generic type EmptyArray`1 introduced in .NET 4.5. This type located in root namespace therefore Namespace property value is null. \nI made quick fix on \nhttps://github.com/pythonnet/pythonnet/blob/develop/pythonnet/src/runtime/assemblymanager.cs#L286\n\nto replace \nif (t.IsGenericTypeDefinition) {\n                    GenericUtil.Register(t);\n                }\n\nwith \n                if (t.IsGenericTypeDefinition \u0026\u0026 t.IsPublic) {\n                    GenericUtil.Register(t);\n                }\nHonestly, I don't understand why the Python.Runtime process non-public type.\n\nIt worked on .NET 4 because this type EmptyArray'1 didn't exist there. As a matter of fact there were no generic types in root namespace.\n\nDo you plan to start taking pull requests soon?\n\nThanks, Dmitry\n","author":{"url":"https://github.com/dmitry-a-morozov","@type":"Person","name":"dmitry-a-morozov"},"datePublished":"2014-01-27T16:44:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/3/pythonnet/issues/3"}