时间段划分

public static class DateSplitHelper     {         #region 根据周期类型获取时间段分组 杨福良 2021-4-15 10:25:12         /// <summary>         /// 根据周期类型获取时间段分组         /// </summary>         /// <param name="startDate"></param>         /// <param name="endDate"></param>         /// <param name="caredCycle"></param>         /// <returns></returns>         public static Dictionary<string, string> GetDates(DateTime startDate, DateTime endDate, int caredCycle)         {             Dictionary<string, string> dates = new Dictionary<string, string>();             if (caredCycle == 0)             {                 dates = DateSplitHelper.GetGroupWeek(startDate.ToShortDateString(), endDate.ToShortDateString());                 return dates;             }             if (caredCycle == 1)             {                 dates = DateSplitHelper.GetGroupMonth(startDate.ToShortDateString(), endDate.ToShortDateString());                 return dates;             }             if (caredCycle == 2)             {                 dates = DateSplitHelper.GetGroupSeason(startDate.ToShortDateString(), endDate.ToShortDateString());                 return dates;             }             if (caredCycle == 3)             {                 dates = DateSplitHelper.GetGroupYear(startDate.ToShortDateString(), endDate.ToShortDateString());                 return dates;             }             return dates;         }         #endregion          #region 根据时间范围获取每周分组 杨福良 2021-4-14 21:49:46         /// <summary>         /// 根据时间范围获取每周分组         /// </summary>         /// <param name="strStartDate">起始时间</param>         /// <param name="strEndDate">结束时间</param>         /// <returns>返回每周起始结束键值对</returns>                           static DateTime LastDayOfMonth(DateTime datetime)         {             return datetime.AddDays(1 - datetime.Day).AddMonths(1).AddDays(-1);         }         #endregion          #region 获取当前季度 杨福良 2021-4-25 18:02:44         /// <summary>         /// 获取当前季度         /// </summary>         /// <param name="date"></param>         /// <returns></returns>         public static string GetMonthSeason(this string date)         {             DateTime dt = Convert.ToDateTime(date);             int month = dt.Month;             if (month <= 3)             {                 return $"{dt.Year}年1季度";             }             if (month <= 6 && month >= 4)             {                 return $"{dt.Year}年2季度";             }             if (month <= 9 && month >= 7)             {                 return $"{dt.Year}年3季度";             }             return $"{dt.Year}年4季度";         }         #endregion          /// <summary>         /// 日期转换         /// </summary>         /// <param name="date"></param>         /// <param name="caredCycle">统计周期 0 按周 1 按月 2 按季度 3 按年</param>         /// <returns></returns>         public static string DateTransform(string startDate, string endDate, int caredCycle)         {             StringBuilder strSql = new StringBuilder();             if (caredCycle == 0)             {                 strSql.Append($@"                          '{startDate}-{endDate}'AS AreaSection,   ");             }             if (caredCycle == 1)             {                 strSql.Append($@"                         '{Convert.ToDateTime(startDate).GetDateTimeFormats('y')[0].ToString()}'AS AreaSection,");             }             if (caredCycle == 2)             {                 strSql.Append($@"                         '{startDate.GetMonthSeason()}'AS AreaSection,");             }             if (caredCycle == 3)             {                 strSql.Append($@"                         '{Convert.ToDateTime(startDate).Year}年'AS AreaSection,");             }             return strSql.ToString();         }          static Dictionary<string, string> GetGroupWeek(string strStartDate, string strEndDate)         {             DateTime dtStartDate = DateTime.Parse(strStartDate);             DateTime dtEndDate = DateTime.Parse(strEndDate);             Dictionary<string, string> dict = new Dictionary<string, string>();              bool ok = true;             while (ok)             {                 DayOfWeek day = dtStartDate.DayOfWeek;                 string dayString = day.ToString();                 DateTime dtTempStartDate = dtStartDate;                 DateTime dtTempDate = DateTime.Now;                 switch (dayString)                 {                     case "Monday":                         dtTempDate = dtTempStartDate.Date.AddDays(+6);                         break;                     case "Tuesday":                         dtTempDate = dtTempStartDate.Date.AddDays(+5);                         break;                     case "Wednesday":                         dtTempDate = dtTempStartDate.Date.AddDays(+4);                         break;                     case "Thursday":                         dtTempDate = dtTempStartDate.Date.AddDays(+3);                         break;                     case "Friday":                         dtTempDate = dtTempStartDate.Date.AddDays(+2);                         break;                     case "Saturday":                         dtTempDate = dtTempStartDate.Date.AddDays(+1);                         break;                     case "Sunday":                         dtTempDate = dtTempStartDate;                         break;                 }                 if (dtTempDate > dtEndDate)                 {                     dict.Add(dtTempStartDate.ToString(), dtEndDate.ToString());                     ok = false;                     continue;                 }                 dict.Add(dtTempStartDate.ToString(), dtTempDate.ToString());                 dtStartDate = dtTempDate.Date.AddDays(+1);                 if (dtStartDate > dtEndDate)                 {                     ok = false;                 }             }              return dict;         }          static Dictionary<string, string> GetGroupMonth(string strStartDate, string strEndDate)         {             DateTime dtStartDate = DateTime.Parse(strStartDate);             DateTime dtEndDate = DateTime.Parse(strEndDate);             Dictionary<string, string> dict = new Dictionary<string, string>();              bool ok = true;             while (ok)             {                 DateTime dtTempStartDate = dtStartDate;                 DateTime dtTempDate = LastDayOfMonth(dtStartDate);                 if (dtTempDate > dtEndDate)                 {                     dtTempDate = dtEndDate;                     ok = false;                 }                 dict.Add(dtTempStartDate.ToString(), dtTempDate.ToString());                 dtStartDate = dtTempDate.Date.AddDays(+1);                 if (dtStartDate > dtEndDate)                     ok = false;                 //if (dtTempDate > dtEndDate)                 //{                 //    dict.Add(dtTempStartDate.ToString(), dtEndDate.ToString());                 //    ok = false;                 //    continue;                 //}                 //dict.Add(dtTempStartDate.ToString(), dtTempDate.ToString());                 //dtStartDate = dtTempDate.Date.AddDays(+1);             }             return dict;         }          static Dictionary<string, string> GetGroupSeason(string strStartDate, string strEndDate)         {             DateTime dtStartDate = DateTime.Parse(strStartDate);             DateTime dtEndDate = DateTime.Parse(strEndDate);             DateTime dtTempStartDate = dtStartDate;             DateTime dtTempDate = DateTime.Now;             Dictionary<string, string> dict = new Dictionary<string, string>();             bool ok = true;             while (ok)             {                 int currentMonth = dtStartDate.Month;                 int currentSeason = currentMonth / 3 + (currentMonth % 3 > 0 ? 1 : 0);                 dtTempDate = DateTime.Parse(DateTime.Parse(dtStartDate.Year + "." + (currentSeason * 3) + "." + "01").ToString("yyyy.MM.dd"));                 dtTempDate = LastDayOfMonth(dtTempDate);                 if (dtTempDate > dtEndDate)                 {                     dtTempDate = dtEndDate;                     ok = false;                 }                 dict.Add(dtTempStartDate.ToString(), dtTempDate.ToString());                 dtStartDate = dtTempDate.Date.AddDays(+1);                 if (dtStartDate > dtEndDate)                 {                     dtTempDate = dtEndDate;                     ok = false;                 }                 dtTempStartDate = dtTempDate.Date.AddDays(+1);             }             return dict;         }         static Dictionary<string, string> GetGroupYear(string strStartDate, string strEndDate)         {             Dictionary<string, string> dict = new Dictionary<string, string>();              DateTime dtStartDate = DateTime.Parse(strStartDate);             DateTime dtEndDate = DateTime.Parse(strEndDate);              //同年             if (dtStartDate.Year == dtEndDate.Year)             {                 dict.Add(dtStartDate.ToShortDateString(), new DateTime(dtStartDate.Year + 1, 1, 1).AddDays(-1).ToShortDateString());                 return dict;             }             bool ok = true;             while (ok)             {                 DateTime dtTempStartDate = dtStartDate;                 DateTime dtTempDate = DateTime.Parse(DateTime.Parse(dtStartDate.Year + ".12." + "31").ToString("yyyy.MM.dd"));                 if (dtTempDate > dtEndDate)                 {                     dtTempDate = dtEndDate;                     ok = false;                 }                 dict.Add(dtTempStartDate.ToString(), dtTempDate.ToString());                 dtStartDate = dtTempDate.Date.AddDays(+1);                 if (dtStartDate > dtEndDate)                 {                     dtTempDate = dtEndDate;                     ok = false;                 }             }             return dict;         }     }