Hello, I think this is a really basic question, but 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#: 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" in ServiceAPI. The author placed the List inside another class, "ServiceInformation" and did not provide a set method, 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#: (I've been assured by the assembly author that this works) 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 # This is a .NET package. 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