Importing from DLL works only when namespace != assembly name #2420

Environment

• Pythonnet version: 3.0.3
• Python version: 3.11.9
• Operating System: 10.0.19045
• .NET Runtime: 8.0.301

Details

I compiled the following code to CalcTest.dll with target framework netstandard2.0:

namespace CalcTest
{
    public static class Calculator
    {
        public static int Add(int a, int b)
        {
            return a + b;
        }
    }
}

Then I tried importing the class Calculator from Python:

import sys
from pathlib import Path

sys.path.append(str(Path(__file__).parent / "DLLs"))

import clr

clr.AddReference("CalcTest")

from CalcTest import Calculator

and I obtained the following error:

ImportError: cannot import name 'Calculator' from 'CalcTest' (unknown location)

Following the tutorial How To Call A Dynamic Library I changed the namespace in C# to CalcTestNS, recompiled the project and updated the import in Python:

from CalcTestNS import Calculator

and it worked.

In the tutorial it is not mentioned that the namespace and the assembly cannot have the same name. It would be a great time-saver to document this.