从C#中的对象列表创建组

本文关键字：列表 创建组 对象 | 更新日期: 2023-09-27 17:58:43

我有一个名为Team的对象列表，我想创建它们的组，但不是按顺序随机的。将组编号提供给功能以及列表

public List<List<Team>> GenerateGroups(List<Team> teams, int amount)
{
    List<List<Team>> result = new List<List<Team>>();
    for (int i = 0; i < amount; ++i)
        result.Add(new List<Team>());
    foreach(Team team in teams)
    {
        //Add something           
    }
    return result;
}

我被困在这里了。我不知道如何添加团队。此外，如果有人能浓缩我的代码，那将非常有帮助。如果有人有更好的想法，我不需要它来返回List>。

从C#中的对象列表创建组

这将随机排序teams，然后将它们分组。列表中输出组的数量取决于amount参数：

public static List<List<Team>> GenerateGroups(List<Team> teams, int amount)
{
    return teams.OrderBy(item => Guid.NewGuid())
            .Select((item, index) => new { Item = item, GroupIndex = index % amount })
            .GroupBy(item => item.GroupIndex, 
                     (key, group) => group.Select(groupItem => groupItem.Item).ToList())
            .ToList();
}

也可以随机使用Random类，但我会用它来创建订单，而不是group by

public static List<List<Team>> GenerateGroups(List<Team> teams, int amount)
{
    Random random = new Random();
    return teams.OrderBy(item => random.NextDouble())
            .Select((item, index) => new { Item = item, GroupIndex = index % amount })
            .GroupBy(item => item.GroupIndex,
                     (key, group) => group.Select(groupItem => groupItem.Item).ToList())
            .ToList();
}

这一个给出了没有重复的随机组：

private static Random _rnd = new Random();
private static Team GetAndRemoveRandomTeam(List<Team> allTeams)
{
    int randomIndex = _rnd.Next(allTeams.Count);
    Team randomTeam = allTeams[randomIndex];
    allTeams.RemoveAt(randomIndex);
    return randomTeam;
}
public static List<List<Team>> GenerateGroups(List<Team> teams, int amount)
{
    int teamCount = (int) teams.Count/amount;
    List<Team> allteams = teams.ToList(); // copy to be able to remove items
    if (teamCount == 0)
        return new List<List<Team>> {allteams};
    List<List<Team>> allTeamGroups = new List<List<Team>>();
    List<Team> thisTeam = new List<Team>();
    while (allteams.Count > 0)
    {
        if (thisTeam.Count == amount)
        {
            allTeamGroups.Add(thisTeam);
            thisTeam = new List<Team>();
        }
        thisTeam.Add(GetAndRemoveRandomTeam(allteams));
    }
    allTeamGroups.Add(thisTeam);
    return allTeamGroups;
}

我认为您最好定义Group类，如：

class Group {
   List<Team> teams;
}

关于添加团队：

Random rnd = new Random();
List<Group> groups = new List<Group>();
        for (int i = 0; i < amount; ++i)
            groups.Add(new Group());
        foreach(Team team in teams)
        {
            int index = rnd.Next(0, amount);
            groups[index].Add(team);
        }
        return groups;
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