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Type parameter works directly, but fails inside List<> #962
Description
Environment
- Pythonnet version: 2.4.0
- Python version: Python 3.7.4
- Operating System: Windows 10 (18362.356)
Details
- Describe what you were trying to get done.
Call a generic method taking a list parameter.
- What commands did you run to trigger this issue? If you can provide a
Minimal, Complete, and Verifiable example
this will help us understand the issue.
C# library:
using System.Collections.Generic;
namespace CSLib
{
public static class CSLib
{
public static bool GetBool() =>
true;
public static void TestValue<T>(T t) {}
public static List<bool> GetBoolList() =>
new List<bool>() { true, false };
public static void TestList<T>(List<T> list) {}
public static void Test()
{
TestValue<bool>(GetBool());
TestList<bool>(GetBoolList());
}
}
}Python code:
from clr import AddReference
from pathlib import Path
AddReference(str(Path.cwd() / "cslib/bin/Debug/netstandard2.0/cslib.dll"))
from System import Boolean
from CSLib import CSLib
CSLib.TestValue[Boolean](CSLib.GetBool())
CSLib.TestList[Boolean](CSLib.GetBoolList())It works fine when the type argument is used directly, but fails when it is inside List<>.
- If there was a crash, please include the traceback here.
Traceback (most recent call last):
File "a.py", line 11, in <module>
CSLib.TestList[Boolean](CSLib.GetBoolList())
TypeError: No method matches given arguments for TestList
Activity
filmor commentedon Sep 27, 2019
This is due to the implicit conversion of .NET lists to Python lists again. Since we don't do it the other way round (and it would also be very tricky to get that right), when you get
CSLib.GetBoolList()you end up with a Python list[True]which doesn't match the method signature.I'm working on removing the implicit conversion in #963.
lostmsu commentedon Sep 23, 2021
This should now be fixed in 3.0