生成每周日期

Question

我相信这之前已经完成，所以我正在寻找一个有效的解决方案，而不是自己的定制解决方案。

给定2个日期，我试图生成准确的每周日期（用于创建每周订单）。

编辑：我需要使用.NET标准库来做到这一点。

Example below, 

Given 28/02/2012 and 6/03/2012. 

so, the weekly dates generated are 
- Week From(Start Monday): Week To(End Sunday): 
- 27/02/2012    - 04/03/2012 
- 05/03/2012    - 11/03/2012 

Another example (1 month) 

Given 01/02/2012 and 29/02/2012 
so, the weekly dates generated are 
- Week From(Start Monday): Week To(End Sunday): 
- 30/01/2012    - 05/02/2012 
- 06/02/2012    - 12/02/2012 
- 13/02/2012    - 19/02/2012 
- 20/02/2012    - 26/02/2012 
- 27/02/2012    - 04/03/2012 

我正在做这个在c＃中。这是否做过？介意分享解决方案？

干杯

Answer 1

下面是使用Noda Time的解决方案。诚然，它需要一个<=算子，我只是执行现在 - 但不应该长时间:)

using System; 
using NodaTime; 

class Test 
{ 
    static void Main() 
    { 
     ShowDates(new LocalDate(2012, 2, 28), new LocalDate(2012, 3, 6)); 
     ShowDates(new LocalDate(2012, 2, 1), new LocalDate(2012, 2, 29)); 
    } 

    static void ShowDates(LocalDate start, LocalDate end) 
    { 
     // Previous is always strict - increment start so that 
     // it *can* be the first day, then find the previous 
     // Monday 
     var current = start.PlusDays(1).Previous(IsoDayOfWeek.Monday); 
     while (current <= end) 
     { 
      Console.WriteLine("{0} - {1}", current, 
           current.Next(IsoDayOfWeek.Sunday)); 
      current = current.PlusWeeks(1); 
     } 
    } 
} 

显然，这是可能做到这一点在正常DateTime为好，但有没有真正代表“只是一个日期“，这使得代码不太清楚 - 你需要自己实现Previous。

编辑：例如，在这种情况下，你可以使用：

using System; 

class Test 
{ 
    static void Main() 
    { 
     ShowDates(new DateTime(2012, 2, 28), new DateTime(2012, 3, 6)); 
     ShowDates(new DateTime(2012, 2, 1), new DateTime(2012, 2, 29)); 
    } 

    static void ShowDates(DateTime start, DateTime end) 
    { 
     // In DateTime, 0=Sunday 
     var daysToSubtract = ((int) start.DayOfWeek + 6) % 7; 
     var current = start.AddDays(-daysToSubtract);   

     while (current <= end) 
     { 
      Console.WriteLine("{0} - {1}", current, current.AddDays(6)); 
      current = current.AddDays(7); 
     } 
    } 
} 

Answer 2

假设你没有弄清楚，开始日期是周一：

var slots = new List<Tuple<DateTime, DateTime>>(); 
DateTime start = new DateTime(2012, 2, 28); 
DateTime end = new DateTime(2012, 3, 6); 
for (DateTime i = start; i < end; i = i.AddDays(7)) 
{ 
    slots.Add(new Tuple<DateTime, DateTime>(i, i.AddDays(6))); 
} 

foreach (var slot in slots) 
{ 
    Console.WriteLine("{0}\t{1}", slot.Item1.ToString("dd/MM/yyyy"), slot.Item2.ToString("dd/MM/yyyy")); 
} 

编辑：假设你必须弄清楚星期一和星期日涵盖的日期范围，你可以向后移动一天，直到你打到星期一，并且一天前进，直到你打到星期天。

class Program 
{ 
    static void Main(string[] args) 
    { 
     var slots = new List<Tuple<DateTime, DateTime>>(); 
     DateTime start = FirstMonday(new DateTime(2012, 2, 28)); 
     DateTime end = FirstSunday(new DateTime(2012, 3, 6)); 
     for (DateTime i = start; i < end; i = i.AddDays(7)) 
     { 
      slots.Add(new Tuple<DateTime, DateTime>(i, i.AddDays(6))); 
     } 

     foreach (var slot in slots) 
     { 
      Console.WriteLine("{0}\t{1}", slot.Item1.ToString("dd/MM/yyyy"), slot.Item2.ToString("dd/MM/yyyy")); 
     } 

     Console.ReadLine(); 
    } 

    static DateTime FirstMonday(DateTime date) 
    { 
     while (date.DayOfWeek != DayOfWeek.Monday) date = date.AddDays(-1); 
     return date; 
    } 
    static DateTime FirstSunday(DateTime date) 
    { 
     while (date.DayOfWeek != DayOfWeek.Sunday) date = date.AddDays(1); 
     return date; 
    } 
} 

Answer 3

该解决方案允许您自定义您的开始和结束工作日：

解决方案：

public Dictionary<DateTime, DateTime> GetWeeklyDateTimes(DateTime from, DateTime to, DayOfWeek startDay, DayOfWeek endDay) 
    { 
     int startEndSpan = 7 - endDay - startDay; 

     // Subtract days until it falls on our desired start day 
     from = from.AddDays(startDay - from.DayOfWeek); 
     // Add days until it falls on our desired end day 
     to = to.AddDays(to.DayOfWeek - endDay + 2); 

     Dictionary<DateTime, DateTime> dateTimes = new Dictionary<DateTime, DateTime>(); 

     while (to.Subtract(from).Days > startEndSpan) 
     { 
      dateTimes.Add(from, from.AddDays(startEndSpan)); 

      from = from.AddDays(startEndSpan + 1); 
     } 

     return dateTimes; 
    } 

实例应用：

// DateTime(2012, 2, 1) corresponds to Year 2012, Month February, Day 1 
Dictionary<DateTime, DateTime> dateTimes = GetWeeklyDateTimes(new DateTime(2012, 2, 1), new DateTime(2012, 2, 29), DayOfWeek.Monday, DayOfWeek.Sunday); 

foreach (KeyValuePair<DateTime, DateTime> entry in dateTimes) 
{ 
    Trace.WriteLine(entry.Key.ToString() + "  " + entry.Value.ToString()); 
}