.net核心如何按日期时间范围获取周日期时间列表

Question

我希望按日期时间范围获取周日期时间列表，我尝试使用以下代码获取每月的周数。

var start = new DateTime(2021, 6, 09);
var end = new DateTime(2021, 7, 01);

end = new DateTime(end.Year, end.Month, DateTime.DaysInMonth(end.Year, end.Month));

var diff = Enumerable.Range(0, Int32.MaxValue)
                             .Select(e => start.AddMonths(e))
                             .TakeWhile(e => e <= end)
                             .Select(e => Convert.ToDateTime(e.ToString("yyyy-MM")));

foreach (var item in diff)
{

   DateTime dateTime = item;
   Calendar calendar = CultureInfo.CurrentCulture.Calendar;
   IEnumerable<int> daysInMonth = Enumerable.Range(1, calendar.GetDaysInMonth(dateTime.Year, dateTime.Month));
   List<Tuple<DateTime, DateTime>> weeks = daysInMonth.Select(day => new DateTime(dateTime.Year, dateTime.Month, day))
                .GroupBy(d => calendar.GetWeekOfYear(d, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday))
                .Select(g => new Tuple<DateTime, DateTime>(g.First(), g.Last()))
                .ToList();
}

执行上面的代码得到如下结果，得到每个月的所有星期。

2021-06-01 2021-06-06
......
2021-07-26 2021-07-31

我想计算从我的开始日期 2021-06-09 到结束日期 2021-07-01 的周数，像这样。

2021-06-09 2021-06-13
2021-06-14 2021-06-20
2021-06-21 2021-06-27
2021-06-28 2021-07-01

如何更改我的代码

Answer 1

这将产生所需的输出：

var start = new DateTime(2021, 6, 09);
var end = new DateTime(2021, 7, 01);
// If you want to get the first week complete, add this line:
//DateTime currDate = start.AddDays(1-(int)start.DayOfWeek);
// Otherwise, use this one
DateTime currDate = start;
while(currDate <= end){
    var dayOfWeek = (int)currDate.DayOfWeek;
    var endOfWeek = currDate.AddDays(7 - dayOfWeek);
    //If you want the complete last week, omit this if
    if(endOfWeek > end)
    {
        endOfWeek = end;
    }
    Console.WriteLine($"{currDate:yyyy-MM-dd} {endOfWeek:yyyy-MM-dd}");
    currDate = endOfWeek.AddDays(1);    
}

输出：

2021-06-09 2021-06-13
2021-06-14 2021-06-20
2021-06-21 2021-06-27
2021-06-28 2021-07-01