Roman to Arabic number conversion without semantic control, C#

Roman to Arabic number conversion without semantic control

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine(r2a(""));           
            Console.WriteLine(r2a("i"));
            Console.WriteLine(r2a("ii"));
            Console.WriteLine(r2a("iii"));
            Console.WriteLine(r2a("iv"));
            Console.WriteLine(r2a("v"));
            Console.WriteLine(r2a("vi"));
            Console.WriteLine(r2a("vii"));
            Console.WriteLine(r2a("viii"));
            Console.WriteLine(r2a("ix"));
            Console.WriteLine(r2a("x"));
            Console.WriteLine(r2a("xi"));
            Console.WriteLine(r2a("xii"));
            Console.WriteLine(r2a("xiii"));
            Console.WriteLine(r2a("xiv"));
            Console.WriteLine(r2a("xv"));
            Console.WriteLine(r2a("xvi"));
            Console.WriteLine(r2a("xvii"));
            Console.WriteLine(r2a("xviii"));
            Console.WriteLine(r2a("xix"));
            Console.WriteLine(r2a("xx"));
            Console.WriteLine(r2a("xxxiv"));
            Console.WriteLine(r2a("pippoxivei"));
            Console.WriteLine(r2a("xxvii") + "/" + r2a("viii") + "/" + r2a("mcmlxxiv"));
        }
        
        public static int r2a(string roman) {
            int       total  = 0;
            int[]     arabic = null;
            List<int> list   = new List<int>();
            Dictionary<char, int> dic = new Dictionary<char, int>() {
               {'I', 1},
               {'V', 5},
               {'X', 10},
               {'L', 50},
               {'C', 100},
               {'D', 500},
               {'M', 1000}
            };
            
            if(string.IsNullOrEmpty(roman)) return 0;
            
            foreach(char c in roman.ToUpper())
               if(dic.ContainsKey(c))
                  list.Add(dic[c]);
            
            arabic = list.ToArray();
            
            for(int x = 0; x < arabic.Length - 1; x++) {
               if(arabic[x] < arabic[x + 1]) {
                  arabic[x] = arabic[x + 1] - arabic[x];
                  arabic[x + 1] = 0;
                  x += 2;
               }
            }
            
            foreach(int val in arabic) total += val;
              
            return total;
        
        }
    }
}


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