.net时间计算

计算定义开始时间至结束时间，中间间隔。

///<summary>
    /// 间隔枚举
    ///</summary>
    public enum IntervalEnum : int
    {
        ///<summary>
        /// 每天
        ///</summary>
      [Description("每天")]
        OneDay=1,
        ///<summary>
        /// 隔一天
        ///</summary>
         [Description("隔一天")]
        TwoDay=2,
        ///<summary>
        /// 隔两天
        ///</summary>
       [Description("隔两天")]
        ThreeDay=3,
        ///<summary>
        /// 隔三天
        ///</summary>
         [Description("隔三天")]
        FourDay=4,
        ///<summary>
        /// 隔4天
        ///</summary>
       [Description("隔4天")]
        FiveDay=5,
        ///<summary>
        ///  隔5天
        ///</summary>
         [Description(" 隔5天")]
        SixDay=6,
        ///<summary>
        ///  隔6天
        ///</summary>
        [Description("隔6天")]
        SevenDay=7,
        ///<summary>
        ///  隔7天
        ///</summary>
        [Description("隔7天")]
        EightDay=8,
        ///<summary>
        /// 隔半个月
        ///</summary>
         [Description("隔半个月")]
        FifteenDay=15,
        ///<summary>
        /// 隔一个月
        ///</summary>
        [Description("隔一个月")]
        ThirtyDay=30,
        ///<summary>
        /// 隔二个月
        ///</summary>
        [Description("隔二个月")]
        SixTyDay=60,
        ///<summary>
        /// 隔一个季度
        ///</summary>
     [Description("隔一个季度")]
        NineDay=9,
        ///<summary>
        /// 隔半年
        ///</summary>
       [Description("隔半年")]
        OnehundredEighty=180
       
    }

 

 public IList<PlanMeasuringDetail> Loop(PlanMeasuringVM VM)
        {
            if (!VM.BeginTime.HasValue || !VM.EndTime.HasValue || !VM.Interval.HasValue)
            {
                return null;
            }
            DateTime beginTime = VM.BeginTime.HasValue ? VM.BeginTime.Value : DateTime.Now;//获取开始时间
            DateTime endTime = VM.EndTime.HasValue ? VM.EndTime.Value : DateTime.Now;//结束时间
            DateTime time = DateTime.Now;//获得当前日期 
            int? days = VM.Interval;//获取间隔天数
            //string shij = VM.Time.ToString();
            int prev = beginTime.DayOfYear;//开始日期是当前年中得第几天
            int next = endTime.DayOfYear;//结束日期是当前年中得第几天
            Decimal re = Convert.ToDecimal((next - prev) / days);
            IList<PlanMeasuringDetail> list = new List<PlanMeasuringDetail>();
            //PlanUseOfDrugsDetail puodd = new PlanUseOfDrugsDetail();

            for (int i = 1; i <= (int)re; i++)
            {
                list.Add(new PlanMeasuringDetail()
                {
                    BackInfo = string.Empty,
                    ExecTime = beginTime.AddDays(Convert.ToDouble(days * i)),
                    IsExecution = "否",
                    PMID = VM.PMID,
                    UserId = VM.UserId,
                    PersonId = VM.PersonId
                });
            }
            return list;
        }