bitconverter sample C#

test.cs

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

namespace test
{
    public class item {
        public bool p;
        public bool v;
    };

    class Program
    {
        static Random rand = null;
        static bool randbool() {
            if (rand==null) rand  = new Random((int)System.DateTime.Now.ToBinary());
            var i = rand.Next();
            return (i%2==0);
        }

        static void Main(string[] args)
        {
            Dictionary<int, item> dic = new Dictionary<int, item>();
            for(var i = 1; i<100; i++)
            {
                dic.Add(i, new item() { p = randbool(), v=randbool()  });
            }

            var s = compress(dic);

            Console.WriteLine(s);

            var tmpdic = decompress(s);
            var tmps = compress(tmpdic);
            
            Console.WriteLine(tmps);

            if (dic.Count != tmpdic.Count)
                Console.WriteLine("Unexpeced!");

            foreach(var k in dic.Keys)
            {
                var v = dic[k];
                var t = tmpdic[k];

                if (
                    v.p != t.p
                    ||
                    v.v != t.v
                    )
                {
                    Console.WriteLine("Unexpected");
                }
            }

            Console.WriteLine("END");
        }

        static string compress(Dictionary<int, item> dic)
        {
            //最大・最小
            var min = int.MaxValue;
            var max = int.MinValue;
            foreach(var k in dic.Keys)
            {
                if (k > max) max = k;
                if (k < min) min = k;
            }

            var bitarray = new BitArray(dic.Count * 2);
            for(var i = min; i <= max; i++)
            {
                bitarray.Set((i - min) * 2 + 0, dic[i].p);
                bitarray.Set((i - min) * 2 + 1, dic[i].v);
            }

            var bytearray = new byte[ (int) Math.Ceiling( (double)dic.Count * 2 / 8 ) ];

            bitarray.CopyTo(bytearray,0);

            var s = string.Empty;
            Array.ForEach(bytearray, i=>{
                if (!string.IsNullOrEmpty(s)) s+= ",";
                s+= i.ToString();
            });

            return min.ToString() + "," +max.ToString() + "," + s;
        }

        static Dictionary<int, item> decompress(string text)
        {
            var tok = text.Split(',');
            var list = new List<int>();
            foreach(var t in tok)
            {
                var n = int.Parse(t);
                list.Add(n);
            }

            var min = list[0];
            var max = list[1];

            var byte_list = new List<byte>();
            for(var i = 2; i<list.Count; i++)
            {
                byte_list.Add((byte)list[i]);
            }

            var bitarray = new BitArray(byte_list.ToArray());

            var dic = new Dictionary<int, item>();
            for (var i = min; i<=max; i++)
            {
                var item = new item();
                item.p = bitarray.Get((i-min) * 2 + 0);
                item.v = bitarray.Get((i-min) * 2 + 1);

                dic.Add(i,item);
            }

            return dic;
        }




    }
}