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//C# 'Hello, world'
//Rextester.Program.Main is the entry point for your code. Don't change it.

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
             var ctx = new FileSizeContext("10Mb");
             var parser = new FileSizeParser();
             parser.Interpret(ctx);
            Console.WriteLine("{0} bytes",ctx.Output);
        }
    }
    
     public class FileSizeContext
    {
        private string input;
        private int output;

public FileSizeContext(string input)
        {
            this.Input = input;
        }

public string Input { get; set; }

public int Output { get; set; }
    }

public abstract class FileSizeExpression
    {
        public abstract void Interpret(FileSizeContext value);
    }

public class FileSizeParser : FileSizeExpression
    {
        private List<FileSizeExpression> expressionTree = new List<FileSizeExpression>()
                                                      {
                                                          new TbFileSizeExpression(),
                                                          new GbFileSizeExpression(),
                                                          new MbFileSizeExpression(),
                                                          new KbFileSizeExpression()
                                                      };

public override void Interpret(FileSizeContext value)
        {
            foreach (FileSizeExpression exp in expressionTree)
            {
                exp.Interpret(value);
            }
        }
    }

public abstract class TerminalFileSizeExpression : FileSizeExpression
    {
        public override void Interpret(FileSizeContext value)
        {
            if(value.Input.EndsWith(this.ThisPattern()))
            {
                double amount = double.Parse(value.Input.Replace(this.ThisPattern(),String.Empty));
                var fileSize = (int)(amount*1024);
                value.Input = String.Format("{0}{1}",fileSize,this.NextPattern());
                value.Output = fileSize;
            }
        }
        protected abstract string ThisPattern();
        protected abstract string NextPattern();
    }

public class KbFileSizeExpression : TerminalFileSizeExpression
    {
        protected override string ThisPattern(){return "Kb";}
        protected override string NextPattern() { return "bytes"; }
    }
    public class MbFileSizeExpression : TerminalFileSizeExpression
    {
        protected override string ThisPattern() { return "Mb"; }
        protected override string NextPattern() { return "Kb"; }
    }
    public class GbFileSizeExpression : TerminalFileSizeExpression
    {
        protected override string ThisPattern() { return "Gb"; }
        protected override string NextPattern() { return "Mb"; }
    }
    public class TbFileSizeExpression : TerminalFileSizeExpression
    {
        protected override string ThisPattern() { return "Tb"; }
        protected override string NextPattern() { return "Gb"; }
    }
}

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Compilation time: 0.23 sec, absolute running time: 0.08 sec, cpu time 0.06 sec, average memory usage: 13 Mb, average nr of threads: 4