將列表<T>的部分拆分爲2列表<T>和加入這些2

Question

在過去的幾個小時中，我一直在困擾這個問題，我希望你能幫助我。

我有一個填充數據的列表（請參閱class：allItems），但我想拆分數據，因此類項目將其所有項與持有子項的項列表中的公共列表保持在一起。

在這段代碼中會發生什麼：在for循環中，項目被添加了與天列表相同的值，這就是我試圖將正確數量的條目添加到天列表中的位置，在allStats列表中顯示同一周的數字。

任何幫助，將不勝感激，謝謝。

public class allItems 
{ 
    public DateTime PunchInDate { get; set; } 
    public DateTime PunchOutDate { get; set; } 
    public DayOfWeek DayOfWeek { get; set; } 
    public int WeekNumber { get; set; } 
    public int MonthNumber { get; set; } 
    public bool PunchedInLate { get; set; } 
    public bool PunchedOutLate { get; set; } 
} 
public class items 
{ 
    public int WeekNumber { get; set; } 
    public int MonthNumber { get; set; } 
    public List<subItems> Days { get; set; } 
} 
public class subItems 
{ 
    public bool PunchedInLate { get; set; } 
    public bool PunchedOutLate { get; set; } 
    public DateTime PunchInDate { get; set; } 
    public DateTime PunchOutDate { get; set; } 
    public DayOfWeek DayOfWeek { get; set; } 
} 
protected int getNumberOfWeeks(List<allItems> list, int numberToFind) 
{ 
    List<allItems> results = list.FindAll(
     delegate(allItems ai) 
     { 
      return ai.WeekNumber == numberToFind; 
     } 
     ); 
    return results.Count; 
} 
public List<items> getStats(string userId, string type) 
{ 
    List<allItems> allStats = getAllStats(userId, "week"); 
    List<items> stats = new List<items>(); 

    foreach (allItems allItem in allStats) 
    { 
     items item = new items(); 
     subItems subItem = new subItems(); 
     List<subItems> Days = new List<subItems>(); 

     item.MonthNumber = allItem.MonthNumber; 
     item.WeekNumber = allItem.WeekNumber; 
     item.Days = Days; 

     int numberOfWeeks = getNumberOfWeeks(allStats, allItem.WeekNumber); 
     for (int i = 0; i < numberOfWeeks; i++) 
     { 
      subItem.DayOfWeek = allItem.DayOfWeek; 
      subItem.PunchedInLate = allItem.PunchedInLate; 
      subItem.PunchedOutLate = allItem.PunchedOutLate; 
      subItem.punchInDate = allItem.PunchInDate; 
      subItem.PunchOutDate = allItem.PunchOutDate; 

      Days.Add(subItem); 
     } 

     items result = stats.Find(week => week.WeekNumber == allItem.WeekNumber); 

     if (result == null) 
     { 
      stats.Add(item); 
     } 
    } 

    return stats; 
} 

Answer 1

聽起來像是你可以做到這一點使用LINQ：

var allItemsList = new List<allItems>() { ... fill in items ... }; 
var asItems = 
    from item in allItemsList 
    group item by new { week = item.weekNumber, month = item.monthNumber } into byWeekMonth 
    select new items() 
    { 
     weekNumber = byWeekMonth.Key.week, 
     monthNumber = byWeekMonth.Key.month, 
     days = byWeekMonth.Select(si => 
      new subItems() 
      { 
       punchedInLate = si.punchedInLate, 
       punchedOutLate = si.punchedOutLate, 
       // etc, other fields 
      }).ToList() 
    };