using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public void Main()

    {

        DateTime a = DateTime.Now.AddHours(1);

        DateTime b = DateTime.Now.AddMinutes(120);

string c = DateDiff(a, b);

        Console.WriteLine(c);

        Console.WriteLine(49.ToString("X"));

        Console.WriteLine(ErrorNumToCode("1"));

         int TimeHour = int.Parse(DateTime.Now.ToString("HH"));

        Console.WriteLine(TimeHour);

        long TimeHour2 = long.Parse(DateTime.Now.ToString("yyyyMMddHHmmss"));

        Console.WriteLine(TimeHour2);

    }

        public string DateDiff(DateTime DateTime1, DateTime DateTime2) {

      string dateDiff = null;

      try {

        TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);

        TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);

        TimeSpan ts = ts1.Subtract(ts2).Duration();

   dateDiff = ts.TotalMinutes.ToString();

        //  ts.Days.ToString() + "天"

        //+ ts.Hours.ToString() + "小時"

        //+ ts.Minutes.ToString() + "分鐘"

        //+ ts.Seconds.ToString() + "秒";

      } catch {

      }

      return dateDiff;

    }

        public string ErrorNumToCode(string Number) {

      string strReturn = "";

      // 判斷數字長度

      // 10進位轉16進位，B開頭

      if (Number.Length == 4) {

        strReturn = int.Parse(Number).ToString("X");

      } else {

        // Function2

        // 0, 1, 2, 3, 4, 5, 6, 7

        // A, C, E, F, H, J, L, P

        List<KeyValuePair<string, int>> kvpList = new List<KeyValuePair<string, int>>()

        {

            new KeyValuePair<string, int>("A", 0),

            new KeyValuePair<string, int>("C", 1),

            new KeyValuePair<string, int>("E", 2),

            new KeyValuePair<string, int>("F", 3),

            new KeyValuePair<string, int>("H", 4),

            new KeyValuePair<string, int>("J", 5),

            new KeyValuePair<string, int>("L", 6),

            new KeyValuePair<string, int>("P", 7),

        };

        // 商

        int intCode = int.Parse(Number) / 32;

        strReturn = kvpList.Where(x => x.Value == intCode).Select(x => x.Key).FirstOrDefault();

        // 餘數

        strReturn += (int.Parse(Number) - (intCode * 32)).ToString().PadLeft(2, '0');

      }

      return strReturn;

    }

​

}

​