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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Derived class in Python not being called by C#","articleBody":"Hello - this is my first post so apologies if this is the wrong forum.\r\n\r\nI'm trying to define a base class in C# and derive from that class in python / pythonnet.  The C# class is very basic:\r\n\r\n```csharp\r\n    public class Order\r\n    {\r\n        public string symbol;\r\n\r\n        public virtual void Evaluate( Bar b )\r\n        {\r\n            Console.WriteLine( \"from Order.Evaluate() - hello!\" );\r\n        }\r\n    }\r\n```\r\n\r\nIn python I have the specific order class defined as:\r\n\r\n```python\r\nclass LimitOrder(Order):\r\n\r\n    def __init__(self):\r\n        self.symbol = \"SQ\"\r\n\r\n\r\n    def Evaluate( self, bar ):\r\n        print( \"LimitOrder.Evaluate() - yay python!\" )\r\n```\r\n\r\nIn C# I have an OMS class with a method: `public void AddOrder( Order order )`\r\n\r\nWhen I pass in `LimitOrder` and call a method in the OMS that calls `Evaluate`, the `Order` class `Evaluate` method is called instead of the `LimitOrder.Evaluate` method.\r\n\r\n\r\nI'm using python 3.6.7 and VS 2019 / .NET 4.7.2\r\n\r\nIn searching for this I'm only seeing 1 instance of a similar question being asked but no solid response.  The `Evaluate()` method (and entire `Order` class for that matter) can be abstract but when I try that I get an error creating the `LimitOrder` object saying I can't create an abstract class.\r\n\r\nAny help would be appreciated.  Thanks in advance.","author":{"url":"https://github.com/jeffzi19","@type":"Person","name":"jeffzi19"},"datePublished":"2020-04-08T16:14:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/1107/pythonnet/issues/1107"}