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你好我是一個試圖建立一個功能，用戶一加一將在中心的時間間隔重複的項目。但是我在數學方面遇到了一些問題，所以我希望你們中的一些人之前做過類似的事情。日曆與重複的項目
它是基於谷歌日曆，其中，事件可通過4種不同的方法重複。
- 日報
- 週刊
- 每月
- 年
然後用戶再定義什麼類型的重複用戶的希望，每天很簡單，它只是每一天。 現在每週更加棘手，因爲用戶可以選擇2個選項
- 周的時間間隔（重複每隔一週或第三等）
- 一週何日（星期一，四等）
每月和每年只有1個選項
- 月/年間隔
除此數據外，我還有以下變量。
- 時間（該項目被添加天的時間）
- StartsOn（項目頁岩開始重複的那一天）
- 發生
- （次項已執行的次數） LASTRUN（上次該項目已執行）
- NextRun（要執行的下一次產品）
所以我沒有顯示未來項目，是解放軍n循環所有NextRun與現在相同的項目，並且在項目執行後，將計算NextRun。 我曾嘗試自己，但它似乎變得過於複雜，所以我希望能在那裏有一個已經完成的解決方案在那裏，或者一個接近，或者乾脆只是表示正軌。
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 結果，這已經過測試並workes !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Itenso.TimePeriod;
namespace ShoppingList.Library.Objects
{
public class RepeatingItem
{
public int? Id { get; set; }
public int ListId { get; set; }
public string Item { get; set; }
public int Quantity { get; set; }
public RepeatsType Repeats { get; set; }
public string RepeatsVar { get; set; }
public TimeSpan Time { get; set; }
public DateTime StartsOn { get; set; }
public EndsType Ends { get; set; }
public string EndsVar { get; set; }
public int Occurrences { get; set; }
public DateTime? LastRun { get; set; }
public DateTime? NextRun { get; set; }
public enum RepeatsType
{
Daily = 0,
Weekly = 1,
Monthly = 2,
Yearly = 3,
}
public enum EndsType
{
Never = 0,
After = 1,
On = 2
}
public DateTime? CalculateNextRun()
{
DateTime? next = null;
if (Repeats == RepeatsType.Daily)
next = HandelDailyRepeating();
else if (Repeats == RepeatsType.Weekly)
next = HandelWeeklyRepeating();
else if (Repeats == RepeatsType.Monthly)
next = HandelMonthlyRepeating();
else if (Repeats == RepeatsType.Yearly)
next = HandelYearlyRepeating();
if (Ends != EndsType.Never && next != null)
{
if (Ends == EndsType.After)
{
if (Occurrences >= int.Parse(EndsVar))
next = null;
}
else if (Ends == EndsType.On)
{
if (next >= DateTime.Parse(EndsVar))
next = null;
}
}
return next;
}
private DateTime? HandelDailyRepeating()
{
DateTime last;
// If there where a last run no problem.
// but we are not sure that the time on
// start on are right.
if (LastRun != null)
last = GetDateTime((DateTime)LastRun, Time);
else
last = GetDateTime(StartsOn, Time);
DateTime next;
while (last < DateTime.UtcNow || last == LastRun)
{
last = last.AddDays(1);
}
return last;
}
private DateTime? HandelWeeklyRepeating()
{
DateTime last;
// If there where a last run no problem.
// but we are not sure that the time on
// start on are right.
if (LastRun != null)
last = GetDateTime((DateTime)LastRun, Time);
else
last = GetDateTime(StartsOn, Time);
string[] split = RepeatsVar.Split(';');
int recuringInterval = int.Parse(split[0]);
if (recuringInterval > 52)
recuringInterval = 52;
DayOfWeek[] weekDays = new DayOfWeek[split.Count() - 1];
for (int i = 1; i < split.Count(); i++)
{
weekDays[i-1] = (DayOfWeek)int.Parse(split[i]);
}
int days = 0;
bool validFound = false;
while (!validFound && days <= (7 * (recuringInterval + 1)))
{
if (last >= DateTime.UtcNow && IsWeekRecuringDay(StartsOn, last, recuringInterval, weekDays)
&& last != LastRun)
{
return last;
}
else
{
last = last.AddDays(1);
if(last > DateTime.UtcNow) days++;
}
}
return null;
}
private DateTime? HandelMonthlyRepeating()
{
DateTime last;
if (LastRun != null)
last = GetDateTime((DateTime)LastRun, Time);
else
last = GetDateTime(StartsOn, Time);
int recuringInterval = int.Parse(RepeatsVar);
int c = 0;
bool validFound = false;
while (!validFound && c <= (recuringInterval + 1))
{
if (last >= DateTime.UtcNow && IsMonthlyRecuringDay(StartsOn, last, recuringInterval)
&& last != LastRun)
{
return last;
}
else
{
last = last.AddMonths(1);
if (last > DateTime.UtcNow) c++;
}
}
return null;
}
private DateTime? HandelYearlyRepeating()
{
DateTime last;
// If there where a last run no problem.
// but we are not sure that the time on
// start on are right.
if (LastRun != null)
last = GetDateTime((DateTime)LastRun, Time);
else
last = GetDateTime(StartsOn, Time);
int recuringInterval = int.Parse(RepeatsVar);
int c = 0;
bool validFound = false;
while (!validFound && c <= (recuringInterval + 1))
{
if (last >= DateTime.UtcNow && IsYearlyRecuringDay(StartsOn, last, recuringInterval)
&& last != LastRun)
{
return last;
}
else
{
last = last.AddYears(1);
if (last > DateTime.UtcNow) c++;
}
}
return null;
}
public bool IsWeekRecuringDay(DateTime start, DateTime test, int recuringInterval, params DayOfWeek[] weekDays)
{
if (test < start || recuringInterval <= 0)
return false;
bool isValidDayOfWeek = false;
DayOfWeek testDayOfWeek = test.DayOfWeek;
// Is the given day a valid day
foreach (DayOfWeek weekDay in weekDays)
{
if (weekDay == testDayOfWeek)
{
isValidDayOfWeek = true;
break;
}
}
// If the day is not in the list, no need to go further
if (!isValidDayOfWeek)
return false;
DateDiff dateDiff = new DateDiff(GetDateTime(start, new TimeSpan(0, 0, 0)), GetDateTime(test, new TimeSpan(0, 0, 0)));
return (dateDiff.Weeks % recuringInterval) == 0;
}
public bool IsMonthlyRecuringDay(DateTime start, DateTime test, int recuringInterval)
{
if (test < start || recuringInterval <= 0)
return false;
DateDiff dateDiff = new DateDiff(GetDateTime(start, new TimeSpan(0, 0, 0)), GetDateTime(test, new TimeSpan(0, 0, 0)));
return (dateDiff.Months % recuringInterval) == 0;
}
public bool IsYearlyRecuringDay(DateTime start, DateTime test, int recuringInterval)
{
if (test < start || recuringInterval <= 0)
return false;
DateDiff dateDiff = new DateDiff(GetDateTime(start, new TimeSpan(0, 0, 0)), GetDateTime(test, new TimeSpan(0, 0, 0)));
return (dateDiff.Years % recuringInterval) == 0;
}
private DateTime GetDateTime(DateTime d, TimeSpan t)
{
return new DateTime(d.Year, d.Month, d.Day, t.Hours, t.Minutes, t.Seconds); ;
}
private TimeSpan GetTimeSpanFromDateTime(DateTime s)
{
DateTime zero = new DateTime(s.Year, s.Month, s.Day, 0, 0, 0);
return s - zero;
}
}
}
似乎工作正常，然後將一天添加到DateTime，直到我點擊從方法的真正回報吧？同樣的方法可以使用數月和數年。我是否理解正確？ – Androme 2011-06-14 11:18:58
不，它考慮日曆的一週開始時使用'DateTime.Subtract'來計算天數的差異。 是的，您可以使用相同的方法數月和數年。 – Jani 2011-06-14 11:37:16
是的，我知道，我只想到這個代碼的實現到我的問題 – Androme 2011-06-14 11:44:59