Object initialization in Pythonnet

Question

Let's assume I've the following C# class:

public class Test
{
    public double X;
    public double Y;
}

I want to use the above C# Test class from IronPython and as well from CPython (using Pythonnet).

Using IronPython 2.7 I was able to generate an object and initializes the fields using object initialization, see the following Python code:

obj = Test(X = 1.0, Y = 2.0)

See as well the following question Object initialization in IronPython

Using CPython 3.9.7 and Pythonnet 3.01 the above code returns the following error:

TypeError: No method matches given arguments for Test..ctor: ()

As workaround I can use the following Python code:

obj = Test()
obj.X = 1.0
obj.Y = 2.0

But I would like to use object initialization.

I've opened an issue on GitHub, see github.com/pythonnet/pythonnet/issues/2038 — Wollmich
– Wollmich, Commented Dec 2, 2022 at 7:27

Olivier Jacot-Descombes · Accepted Answer · 2022-12-01 13:24:31Z

1

Not sure if I get your question, but try this:

Test test = New Test();
/* or */ var test = New Test();
/* then */ test.x = whatever;

edited Dec 1, 2022 at 13:24

Olivier Jacot-Descombes

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answered Dec 1, 2022 at 13:15

Siba Daki

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2 Comments

Wollmich Over a year ago

The New keyword and the ; are not needed in Python.

Wollmich Over a year ago

I want to use my C# class from IronPython and CPython (using PYTHONNET).

Olivier Jacot-Descombes · Accepted Answer · 2022-12-01 13:30:56Z

0

You can do this in two ways in C#:

Object Initializer approach:

var obj = new Test { X = 1.0, Y = 2.0 };

The constructor approach. For this approach you must add a constructor to the class:

public class Test
{
    public double X;
    public double Y;

    public Text( double x, double y)
    {
        X = x;
        Y = y;
    }
}

Then you can create the object with:

var obj = new Test(1.0, 2.0);

answered Dec 1, 2022 at 13:30

Olivier Jacot-Descombes

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4 Comments

Wollmich Over a year ago

Thanks for your answer. But in my case I don't have the source code of .NET assembly.

Olivier Jacot-Descombes Over a year ago

You can derive a class from a C# class in IronPython. This would allow you to add it a constructor (__init__()).

Wollmich Over a year ago

But what if the C# class is sealed?

Olivier Jacot-Descombes Over a year ago

Then write a factory method.

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