Creating MATLAB data structures in C# library to use in MATLAB

I am trying to interface a C# library to MATLAB. Using standard properties and methods works fine, however the performance is slow. I figured I'd try to use MWArray.dll to create MATLAB data structures directly in C# with an interface DLL which will be called by MATLAB.

However, whenever I call a method that uses MWArray, I get a type initializer error:

The type initializer for 'MathWorks.MATLAB.NET.Arrays.MWArray' threw an exception.

My C# class looks like this:

using MathWorks.MATLAB.NET.Arrays;

namespace Dummy.MatlabInterop

{

public class Example

{

public MWStructArray getStruct()

{

return new MWStructArray(new int[] { 1, 1 }, new string[] { "Dummy" });

}

}

}

This is called by MATLAB like this:

NET.addAssembly(fullfile(pwd, 'Dummy.MatlabInterop.dll'));

ex = Dummy.MatlabInterop.Example();

s = ex.getStruct(); % <- This throws 'The type initializer for 'MathWorks.MATLAB.NET.Arrays.MWArray' threw an exception.'

The dll is created for 64bit. I cannot find much documentation on this. Is this approach valid? What am I doing wrong? Any advice would be much appreciated.

Answer 1

[Kojiro Saito]

MathWorks.MATLAB.NET.Arrays is a part of MATLAB Compiler SDK and is different from MATLAB's external interface for .NET.

[MATLAB Compiler SDK] Integrate a .NET Assembly Into a C# Application

As NET.addAssembly document says, "NET.addAssembly does not support assemblies generated by the MATLAB Compiler SDK™ product.", so we cannot call the .NET libraries which use MathWorks.MATLAB.NET.Arrays.

[Constantin]

Thank you for the reply. I will use a different approach.