DateTime时间转换引发的耗时问题

        static void Main(string[] args)
        {
            var datetime = DateTime.Parse("2020-10-10 05:05:05");
            var listStr = new List<string>();
            var listLong = new List<long>();
            for (int i = 0; i < 10000 * 1000; i++)
            {
                listStr.Add(datetime.ToString("yyyy-MM-dd HH:mm:ss"));
                listLong.Add(datetime.ToBinary());
            }


            Stopwatch sw = new Stopwatch();
            sw.Start();
            foreach (var item in listStr)
            {
                DateTime.Parse(item);
            }
            sw.Stop();
            Console.WriteLine(sw.ElapsedMilliseconds / 1000d);

            sw.Restart();
            foreach (var item in listLong)
            {
                DateTime.FromBinary(item);
            }
            sw.Stop();
            Console.WriteLine(sw.ElapsedMilliseconds / 1000d);

        }