[混编] FORTRAN与C#中数据传递方式的请教

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;
namespace ConsoleApplication1
{
  class Program
  {
    public struct inx
    {
      public int i;
      public double rr;
    }
    public struct outx
    {
      public int a;
      public double rr;
    }
    [DllImport("fortran_lib")] extern static int myfortran(ref inx A, ref outx B);
    static void Main(string[] args) 
    {
      inx X;
      outx Y;
      X.i = 3;
      X.rr= 6.0;
      Y.a = 1;    
      Y.rr=3.0;
      int c = myfortran( ref X , ref Y );
      Console.WriteLine("c# return:");
      Console.WriteLine(Y.rr);
      Console.Read();
    }
  }
}