计算时间 相加，相减 的方法，TimeSpan 数据转换

 #region  Time calculation method
        public static string DelayTypeTime_1(DateTime ArrivalTime_1, DateTime DepartureTime_1, TimeSpan DesignatedTime_1)
        {
            if (ArrivalTime_1 < DepartureTime_1)
            {

                DataTotal = ArrivalTime_1.AddHours(24).Subtract(DepartureTime_1.Add(DesignatedTime_1));
                ArrivalTime = Convert.ToString(DataTotal);
            }
            else
            {
                DataTotal = ArrivalTime_1.Subtract(DepartureTime_1.Add(DesignatedTime_1));
                ArrivalTime = Convert.ToString(DataTotal);
            }
            IntTotal = Convert.ToInt32(DataTotal.Hours * 3600 + DataTotal.Minutes * 60 + DataTotal.Seconds);
            IntDesignatedTime = Convert.ToInt32(DesignatedTime_1.Hours * 3600 + DesignatedTime_1.Minutes * 60 + DesignatedTime_1.Seconds);
            if (IntTotal < IntDesignatedTime && IntTotal < 0)
            {
                ArrivalTime = "00:00:00";
            }
            return ArrivalTime;

        }

        public static string DelayTypeTime_2_4(DateTime ArrivalTime_2, DateTime ScheduledTime_2)
        {
            if (ArrivalTime_2 < ScheduledTime_2)
            {
                DataTotal = ArrivalTime_2.AddHours(24).Subtract(ScheduledTime_2).Duration();
                ArrivalTime = Convert.ToString(DataTotal);
            }
            else
            {
                DataTotal = ArrivalTime_2.Subtract(ScheduledTime_2).Duration();
                ArrivalTime = Convert.ToString(DataTotal);
            }
            IntTotal = Convert.ToInt32(DataTotal.Hours * 3600 + DataTotal.Minutes * 60 + DataTotal.Seconds);
            IntDesignatedTime = Convert.ToInt32(ScheduledTime_2.Hour * 3600 + ScheduledTime_2.Minute * 60 + ScheduledTime_2.Second);
            if (IntTotal < 0)
            {
                ArrivalTime = "00:00:00";
            }
            return ArrivalTime;
        }
        public static string DelayTypeTime_3_DTime(DateTime ArrivalFirstTime_3, TimeSpan ChangeTime_3, TimeSpan DesignatedTime_3)
        {
            DepartureTime_3 = ArrivalFirstTime_3.Add(ChangeTime_3).Add(DesignatedTime_3);
            ArrivalTime = Convert.ToString(DepartureTime_3);
            return ArrivalTime;
        }
        public static string DelayTypeTime_3(DateTime ArrivalTime_3, DateTime DepartureTime_3, DateTime ArrivalFirstTime_3, TimeSpan ChangeTime_3, TimeSpan DesignatedTime_3)
        {
            if (ArrivalTime_3 < DepartureTime_3)
            {
                DepartureTime_3 = ArrivalFirstTime_3.Add(ChangeTime_3).Add(DesignatedTime_3);
                DataTotal = (ArrivalTime_3.AddHours(24)).Subtract(DepartureTime_3);
                AccumulatlveTime_3 = Convert.ToString(DataTotal);
                ArrivalTime = AccumulatlveTime_3;
            }
            else
            {
                DepartureTime_3 = ArrivalFirstTime_3.Add(ChangeTime_3).Add(DesignatedTime_3);
                DataTotal = ArrivalTime_3.Subtract(DepartureTime_3);
                AccumulatlveTime_3 = Convert.ToString(DataTotal);
                ArrivalTime = AccumulatlveTime_3;
            }
            IntTotal = Convert.ToInt32(DataTotal.Hours * 3600 + DataTotal.Minutes * 60 + DataTotal.Seconds);
            IntDesignatedTime = Convert.ToInt32(DepartureTime_3.Hour * 3600 + DepartureTime_3.Minute * 60 + DepartureTime_3.Second);
            if (IntTotal < 0)
            {
                ArrivalTime = "00:00:00";
            }
            return ArrivalTime;
        }

 DesignatedTime_1 = TimeSpan.Parse(AlistDateInofValue.Text);