Hi Mark, You are facing https://github.com/pythonnet/pythonnet/issues/514 At this moment the easiest way to do it is to add a method to ServiceInformation to add an item to SerivceHosts collection. E.g. public void AddServiceHost(string serviceHost) => this.ServiceHosts.Add(serviceHost); then call it from Python. Regards, Victor From: Mark Brighton Hello, I think this is a really basic question, but despite searching I haven't found a solution. I've been asked to use a .NET assembly from python. I have programed in other languages, but not C#. In the brief time I've used it, PythonNet has been fantastic... with one little wrinkle. Here's a pared down version of the C# that I’m trying to access from Python: namespace Service.API { public class ServiceAPI { private static ServiceAPI m_Instance = new ServiceAPI(); public static ServiceAPI Instance { get { return m_Instance; } }
public ServiceAPI() { } ~ServiceAPI() {} ServiceInformation m_ServiceInformation = new ServiceInformation(); public List<string> ServiceHosts { get { return m_ServiceInformation.ServiceHosts; } } } public class ServiceInformation { public List<string> ServiceHosts { get; set; } public ServiceInformation() { ServiceHosts = new List<string>(); } } }
I need to add strings to the List “ServiceHosts”, accessing it via a ServiceAPI object. The author placed the List inside another class, "ServiceInformation" and did not provide a set accessor, so that the ServiceHosts could not be altered to another object, while allowing strings to be added and removed from it. I think adding a string to that list is trivial in C#: ServiceAPI.Instance.ServiceHosts.Add('1.1.1.1'); So I try it in Python: >>> import clr # Pyton.NET package >>> clr.AddReference("Service.API") >>> import Service.API >>> import System >>> Service.API.ServiceAPI.Instance.ServiceHosts.Add('1.1.1.1') Traceback (most recent call last): File "<interactive input>", line 1, in <module> AttributeError: 'ServiceAPI' object has no attribute 'Add' This is a List that PythonNet is mapping onto a python list: >>> Service.API.ServiceAPI.Instance.ServiceHosts [] So try using a python method: >>> Service.API.ServiceAPI.Instance.ServiceHosts.append('1.1.1.1') >>> Service.API.ServiceAPI.Instance.ServiceHosts [] Nope. And I start suspecting that I've added that string to a boxed version of the list. But because there's no set accessor, I can't do this: >>> hosts = Service.API.ServiceAPI.Instance.ServiceHosts >>> hosts.append('1.1.1.1') >>> Service.API.ServiceAPI.Instance.ServiceHosts = hosts Traceback (most recent call last): File "<interactive input>", line 1, in <module> TypeError: property is read-only So what about calling the unbound list method, passing in the list? >>> System.Collections.Generic.List[String].Add( Service.API.ServiceAPI.Instance.ServiceHosts, '1.1.1.1') Traceback (most recent call last): File "<interactive input>", line 1, in <module> AttributeError: 'ServiceAPI' object has no attribute 'Add' The author of this assembly has offered to create a specific method so that I can access the list, but he assures me that this is a common C# pattern that I will encounter frequently. I can't just create an instance of ServiceInformation and add the hosts to that, ServiceAPI has no method for getting or setting m_ServiceInformation. Any help in setting me in the right direction would be appreciated. Thanks, Mark Brighton _______________________________________________ PythonNet mailing list -- pythonnet@python.org To unsubscribe send an email to pythonnet-le...@python.org https://mail.python.org/mailman3/lists/pythonnet.python.org/ |
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