Formula com calculo

formula.cs

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

namespace ConsoleApplicationteste
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("Olá");
            //Exemplo de uso
            Formula formula = new Formula("(#(AB)+#(CD))-#(DD)");
            Dictionary<string,decimal> examples = new Dictionary<string, decimal> {};
            examples.Add("AB", 10);
            examples.Add("CD", 20);
            examples.Add("DD", 10);
            object result = formula.calculate(examples);
            Console.WriteLine("O resultado da expressao  (#(AB)+#(CD))-#(DD) e = " + result);
            Console.ReadKey();


        }
    }

    class Formula
    {
        string formula;
        string pattern = @"(?<=\#\().*?(?=\))";

        public Formula(string formula)
        {
            this.formula = formula;
        }

        public List<string> GetCodes()
        {
            MatchCollection matchList = Regex.Matches(this.formula, this.pattern);
            var codes = matchList.Cast<Match>().Select(match => match.Value).ToList();
            
            return codes;
        }

        public object calculate(Dictionary<string,decimal> codeValues)
        {
            string expression = this.formula;

            //Transforma formula para expressao
            foreach (var current in codeValues)
            {
                string tag = "#(" + current.Key.ToString() + ")";
                expression = expression.Replace(tag, current.Value.ToString());
            }
            //Calcula formula
            object result = new DataTable().Compute(expression,"");
            return result;
        }


    }
}