Adv2015/D08.2/Program.cs

using System;
using System.IO;
using System.Text.RegularExpressions;

namespace D08._2
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 1) throw new ArgumentException();
            if (File.Exists(args[0]) == false) throw new FileNotFoundException();

            int original = 0, escaped = 0;

            using (var file = File.OpenText(args[0]))
            {
                while (true)
                {
                    var line = file.ReadLine();
                    if (line == null) break;

                    var nstring = '"' + Regex.Escape(line).Replace("\"", "\\\"") + '"';

                    original += line.Length;
                    escaped += nstring.Length;
                }
            }

            int answer = escaped - original;
            Console.WriteLine($"The answer is : {answer}");
        }
    }
}