进制格式转换 c#

  public static string mdFiveGet(string mdNum)
        {
            String BinOne = string.Empty;
            String BinAll = string.Empty;
            char[] nums = mdNum.ToCharArray();
            for (int i = 0; i < nums.Length; i++)
            {
                string number = nums[i].ToString();
                int num = Int32.Parse(number, System.Globalization.NumberStyles.HexNumber);
                BinOne = Convert.ToString(num, 2);
                BinAll = BinAll + BinOne;
            }
            Console.WriteLine("BIN:" + BinAll);
            return BinAll;
        

　　　　 private static string _test = "1";
        static void Main(string[] args)
        {
            string a = "";

            byte[] bytes4 = Encoding.GetEncoding("GB2312").GetBytes(_test);
            string s4 = Encoding.GetEncoding("GB2312").GetString(bytes4);
            foreach (byte bt in bytes4)
                a += bt;
            Console.WriteLine("字节流为：" + a);
            Console.WriteLine("将字节流还原为字符串：" + s4);
            Console.ReadKey();
        }