Two objects created when calling C# constructor #2555

Environment

• Pythonnet version: 3.0.5
• Python version: 3.11
• Operating System: Windows 11
• .NET Runtime: 9.0

Details

When instantiating a C# class in a Python module, two C# objects are created:

C# class:

class SomeClass
{
  public SomeClass()
  { 
  }

  public SomeClass(int arg1, string arg2)
  {
  }
}

Python module

obj = SomeClass()

The default constructor SomeClass() is called twice in MetaType.tp_call , first by using NewReference obj = NativeCall.Call_3(tp_new, tp, args, kw); and then by type.Init(obj.Borrow(), args, kw).

If Python does this:

obj = SomeClass(1,  "str")

Then using NewReference obj = NativeCall.Call_3(tp_new, tp, args, kw); calls the default constructor and then type.Init(obj.Borrow(), args, kw) calls the one with arguments.

Is this an expected behaviour? Is there a workaround or fix for this? I am working with a case where I really don't whant the constructor to be called twice.

Is this related to #495?

Thank you in advance.