Question

采用以下示例：

public class Team
{
    public int Id { get; set; }
    public string TeamName { get; set; }
    public Members[] Members { get; set; }
}

public class Members
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

如果我有由以下人员组成的C＃团队名单：

[
{
    "Id" : 1,
    "TeamName" : "A",
    "Members": [
        {
            "Id": 1,
            "FirstName": "Arthur",
            "LastName": "Nudge"
        },
        {
            "Id": 2,
            "FirstName": "Ken",
            "LastName": "Shabby"
        }
    ]
},
{
    "Id" : 2,
    "TeamName" : "B",
    "Members": [
        {
            "Id": 1,
            "FirstName": "Spiny",
            "LastName": "Norman"
        },
        {
            "Id": 2,
            "FirstName": "Raymond",
            "LastName": "Luxury-Yacht"
        }
    ]
}
]

我该如何通过成员以及团队ID等方式对Linq查询进行giva

{
    "TeamId": 1,
    "Id": 1,
    "FirstName": "Arthur",
    "LastName": "Nudge"
},
{
    "TeamId": 1,
    "Id": 2,
    "FirstName": "Ken",
    "LastName": "Shabby"
},
{
    "TeamId": 2,
    "Id": 1,
    "FirstName": "Spiny",
    "LastName": "Norman"
}

我可以使用以下方法从“团队”列表中返回“成员”列表 Teams.SelectMany(t => t.Members).ToList();，但如何同时包含TeamId

Answer 1

以这种方式使用SelectMany：

var q = Teams
    .SelectMany(t => t.Members
        .Select(tm => new{ TeamId = t.Id, tm.Id, tm.FirstName, tm.LastName }));

Answer 2

您可以使用自定义LINQ查询将其组合为带有所需字段的匿名对象列表：

var list = (from team in Teams
           from member in team.Members
           select new 
           {
               TeamId = team.Id,
               member.Id,
               member.FirstName,
               member.LastName
           }).ToList();

Answer 3

结合使用SelectMany和Select：

teams.SelectMany(team => team.Members.Select(member => new
      {
          TeamId = team.Id,
          MemberId = member.Id,
          member.FirstName,
          member.LastName
      })).ToList();

内部Select将每个成员和团队ID映射为匿名类型。
外部SelectMany将嵌套的IEnumerable<...>展平为单个IEnumerable<...>

具有父字段值的C＃Linq汇总子数组

3 个答案: