Question

我有一个班级

public class RoomAvail
{
    public int OCCUPANCY { get; set; }
    public int ChildCount { get; set; }
    public string ChildAges { get; set; }
}

我有RoomAvail列表，即列表房间;

rooms = { new RoomAvail{OCCUPANCY =1,ChildCount =1,ChildAges ="1" }
          new RoomAvail{OCCUPANCY =2,ChildCount =2,ChildAges ="1,2" }
          new RoomAvail{OCCUPANCY =3,ChildCount =3,ChildAges ="1,2,3" }
        }

我填充了房间的价值。

我有List listAge = {12,13,14,14}

我的要求：如果列表中的任何OCCUPANCY = 2，我应该在ChildAges中附加listAge的值。

最终输出：

rooms = { new RoomAvail{OCCUPANCY =1,ChildCount =1,ChildAges ="1" }
          new RoomAvail{OCCUPANCY =2,ChildCount =2,ChildAges ="1,2,12,13,14,15" }
          new RoomAvail{OCCUPANCY =3,ChildCount =3,ChildAges ="1,2,3" }
        }

我只想更新房间变量。

我在做：

rooms.Where(y => y.OCCUPANCY == 2)
     .Select(x => x.ChildAges)
     .Aggregate((i, j) => i + listAge  + j);

由于

Answer 1

LINQ不会修改您的对象。使用循环

foreach(var room in rooms.Where(y => y.OCCUPANCY == 2))
{
    room.ChildAges = string.Join(",", room.ChildAges.Split(',').Concat(listAge));
}

Answer 2

你可以尝试这个：

// Get the rooms with OCCUPANCY value equal to 2.
rooms = rooms.Where(x=>x.OCCUPANCY==2);

// Iterate through the selected rooms.
foreach(var room in rooms)
{
    // Build a list of integers based on the room's list age.
    List<int> currentListAge = room.ChildAges.Split(',').Select(int.Parse).ToList();

    // Concat the currentListAge with the listAge, order the resulting list and
    // then build a comma separated value list.
    room.ChildAges = String.Join(",", currentListAge.Concat(listAge)
                                                    .OrderBy(x=>x)
                                                    .Select(x=>x.ToString())
                                                    .ToList());
}

更新列表连接字符串

2 个答案: