How Can I Call a C# Library (Including WPF Components) from Python?

Calling C# Library from Python

Assuming you have tried using IronPython but encountered difficulties, you may consider calling your C# code from Python instead. This approach can be particularly useful if you have a C# library that includes WPF components, such as the following example:

`csharp
using System.Runtime.InteropServices;
using System.EnterpriseServices;

namespace DataViewerLibrary
{

public interface ISimpleProvider
{
   [DispIdAttribute(0)]
   void Start();
}

[ComVisible(true)]
[ClassInterface(ClassInterfaceType.None)]
public class PlotData : ServicedComponent, ISimpleProvider
{
   public void Start()
   {
      Plot plotter = new Plot();
      plotter.ShowDialog();
   }
}

}
`

To call this C# code from Python, you can utilize the NuGet package "UnmanagedExports." By installing this package, you can export the C# code without creating a COM layer. Here's an example of how you can do it:

`csharp
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using RGiesecke.DllExport;

class Test
{

[DllExport("add", CallingConvention = CallingConvention.Cdecl)]
public static int TestExport(int left, int right)
{
    return left + right;
}

}
`

Once you have exported the C# code, you can load the DLL and call the exposed methods from Python:

`python
import ctypes
a = ctypes.cdll.LoadLibrary(source)
a.add(3, 5)
`

This method provides a convenient approach for calling C# libraries, including those that use WPF components, from Python code.

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