将列表<T>的部分拆分为2列表<T>和加入这些2

Question

在过去的几个小时中，我一直在困扰这个问题，我希望你能帮助我。

我有一个填充数据的列表（请参阅class：allItems），但我想拆分数据，因此类项目将其所有项与持有子项的项列表中的公共列表保持在一起。

在这段代码中会发生什么：在for循环中，项目被添加了与天列表相同的值，这就是我试图将正确数量的条目添加到天列表中的位置，在allStats列表中显示同一周的数字。

任何帮助，将不胜感激，谢谢。

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

听起来像是你可以做到这一点使用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() 
    };