How to call C# ENUM with values whose name start with underscore?

I like to call a C# function in MATLAB.

The C# function has ENUM with values whose names start with underscores.

And a function which accepts the Enum as argument, something like this--

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace firstdotnet
{
    public enum RF_Amp_Atten_Step

      {
          _3dB = 8,
          _9dB = 17,
          _12dB = 18,
          _15dB = 19,
          _6dB = 28,
          aa = 25,
          abc_ = 30,
          Full_Core = 56,
      }
      public class fistclass
      {
          public int callmylib(RF_Amp_Atten_Step e)
          {
              return (int)e;
          }
      }
  }

Now, to call this function in MATLAB, I compile this program into assembly, and using Net.addAssembly and call assembly's function.

asm = NET.addAssembly('<FullPathToAssembly>\firstdotnet.dll');
cls = firstdotnet.fistclass;

If I use Enum's value whose name start with letter, then it works fine-

res = callmylib(cls, firstdotnet.RF_Amp_Atten_Step.Full_Core);

But, when calling the function with Enum's value whose name start with underscore gives error- ERROR: res = callmylib(cls, firstdotnet.RF_Amp_Atten_Step._12dB); ↑ Error: Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.

I know that a valid variable name in MATLAB can only start with a letter, followed by letters, digits, or underscores.

And, the Enum that we are passing to function is a MATLAB struct which cannot have invalid variable names.

But, is there a way I can use those Enum values?

I cannot modify my C# code.

Answer 1

[MathWorks Support Team]

If you type in firstdotnet.RF_Amp_Atten_Step. and then hit tab, the MATLAB autocomplete brings up a list of the possible values.

In there you'll notice that all the underscore dB values have been renamed such that the underscore is at the end (3dB_, 6dB_, etc.).

I think the .NET framework or MATLAB renamed it.

The underscore throws off the MATLAB interpreter if you try to access it directly.

To workaround this, you can use the dot-parent syntax with the renamed version of ENUM value-

res = callmylib(cls, firstdotnet.RF_Amp_Atten_Step.('12dB_'))

This will let you use all ENUM values without modifying your C# code.