根据开始日期，结束日期，计算出日历上有几周的方法

  public static int CalculationWeek(DateTime periodStart, DateTime periodEnd){const DayOfWeek FIRST_DAY_OF_WEEK = DayOfWeek.Monday;const DayOfWeek LAST_DAY_OF_WEEK = DayOfWeek.Sunday;const int DAYS_IN_WEEK = 7;DateTime firstDayOfWeekBeforeStartDate;int daysBetweenStartDateAndPreviousFirstDayOfWeek = (int)periodStart.DayOfWeek - (int)FIRST_DAY_OF_WEEK;if (daysBetweenStartDateAndPreviousFirstDayOfWeek >= 0){firstDayOfWeekBeforeStartDate = periodStart.AddDays(-daysBetweenStartDateAndPreviousFirstDayOfWeek);}else{firstDayOfWeekBeforeStartDate = periodStart.AddDays(-(daysBetweenStartDateAndPreviousFirstDayOfWeek + DAYS_IN_WEEK));}DateTime lastDayOfWeekAfterEndDate;int daysBetweenEndDateAndFollowingLastDayOfWeek = (int)LAST_DAY_OF_WEEK - (int)periodEnd.DayOfWeek;if (daysBetweenEndDateAndFollowingLastDayOfWeek >= 0){lastDayOfWeekAfterEndDate = periodEnd.AddDays(daysBetweenEndDateAndFollowingLastDayOfWeek);}else{lastDayOfWeekAfterEndDate = periodEnd.AddDays(daysBetweenEndDateAndFollowingLastDayOfWeek + DAYS_IN_WEEK);}int calendarWeeks = 1 + (int)((lastDayOfWeekAfterEndDate - firstDayOfWeekBeforeStartDate).TotalDays / DAYS_IN_WEEK);return calendarWeeks;}

循环这几周，计算出每周的开始日期结束日期

 DateTime periodStart = DateTime.Parse("2021-03-24");DateTime periodEnd = DateTime.Parse("2021-03-29");string weekBegin = string.Empty;string weekEnd = string.Empty;int calculationWeekTemp = CalculationWeek(periodStart, periodEnd);for (int i = 1; i <= calculationWeekTemp; i++){if (i == 1 && i == calculationWeekTemp)//只有一周的情况{weekBegin = periodStart.ToString();weekEnd = periodEnd.ToString();LogHelper.WriteInfoLog(string.Format("i={0} begin={1} end={2}", i, weekBegin, weekEnd));}else if (i == 1 && i != calculationWeekTemp)//大于1周的情况{weekBegin = periodStart.ToString();DateTime dtDate = DateTime.Parse(weekBegin);int weekEndNum = 0;if (dtDate.DayOfWeek == DayOfWeek.Monday){weekEndNum = 6;}if (dtDate.DayOfWeek == DayOfWeek.Tuesday){weekEndNum = 5;}if (dtDate.DayOfWeek == DayOfWeek.Wednesday){weekEndNum = 4;}if (dtDate.DayOfWeek == DayOfWeek.Thursday){weekEndNum = 3;}if (dtDate.DayOfWeek == DayOfWeek.Friday){weekEndNum = 2;}if (dtDate.DayOfWeek == DayOfWeek.Saturday){weekEndNum = 1;}if (dtDate.DayOfWeek == DayOfWeek.Sunday){weekEnd= periodStart.ToString("yyyy-MM-dd");}else{weekEnd = periodStart.AddDays(weekEndNum).ToString("yyyy-MM-dd");}LogHelper.WriteInfoLog(string.Format("i={0} begin={1} end={2}", i, weekBegin, weekEnd));}else if (i == calculationWeekTemp)//处理最后一周的情况{weekBegin = weekEnd.ToString();weekEnd = periodEnd.ToString();LogHelper.WriteInfoLog(string.Format("i={0} begin={1} end={2}", i, weekBegin, weekEnd));}else//处理中间的周情况{weekBegin = weekEnd.ToString();weekEnd = DateTime.Parse(weekBegin).AddDays(7).ToString("yyyy-MM-dd");LogHelper.WriteInfoLog(string.Format("i={0} begin={1} end={2}", i, weekBegin, weekEnd));}}

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根据开始日期，结束日期，计算出日历上有几周的方法

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