使用LINQ to组对象的列表到对象名单，新名单分组 [英] Using Linq to group a list of objects into a new grouped list of list of objects

问题描述

我不知道这是可能的Linq但在这里去...

我有一个对象：

 公共类用户
{
  公众诠释用户名{搞定;组; }
  公共字符串用户名{获得;组; }
  公众诠释组ID {搞定;组; }
}
 

我返回一个列表可能如下所示：

 列表＆lt;使用者＆GT;用户列表=新的List＆lt;使用者＆GT;（）;
userList.Add（新用户{用户名= 1，用户名=UserOne，组ID = 1}）;
userList.Add（新用户{用户名= 2，用户名=UserTwo，组ID = 1}）;
userList.Add（新用户{用户ID = 3，用户名=UserThree，组ID = 2}）;
userList.Add（新用户{用户名= 4，用户名=UserFour，组ID = 1}）;
userList.Add（新用户{用户名= 5，用户名=UserFive，组ID = 3}）;
userList.Add（新用户{用户名= 6，用户名=UserSix，组ID = 3}）;
 

我希望能够运行上面的列表组中的所有用户通过组ID在LINQ查询。因此，出酒馆将用户列表列表包含用户（如果是有道理的？）。因此，OUT输出会是这样的：

  GroupedUserList
    UserList的
        用户ID = 1，用户名=UserOne，组ID = 1
        用户ID = 2，用户名=UserTwo，组ID = 1
        用户名= 4，用户名=UserFour，组ID = 1
    UserList的
        用户ID = 3，用户名=UserThree，组ID = 2
    UserList的
        用户名= 5，用户名=UserFive，组ID = 3
        用户名= 6，用户名=UserSix，组ID = 3
 

我已经使用LINQ GROUPBY子句试图但这似乎返回键列表和它不是通过正确分组：

  VAR groupedCustomerList = userList.GroupBy（U =＆GT; u.GroupID）.ToList（）;
 

任何帮助将是非常美联社preciated。

感谢

解决方案

  VAR groupedCustomerList =用户列表
    .GroupBy（U =＆GT; u.GroupID）
    。选择（GRP =＆GT; grp.ToList（））
    .ToList（）;
 

I don't know if this is possible in Linq but here goes...

I have an object:

public class User
{
  public int UserID { get; set; }
  public string UserName { get; set; }
  public int GroupID { get; set; }
}

I return a list that may look like the following:

List<User> userList = new List<User>();
userList.Add( new User { UserID = 1, UserName = "UserOne", GroupID = 1 } );
userList.Add( new User { UserID = 2, UserName = "UserTwo", GroupID = 1 } );
userList.Add( new User { UserID = 3, UserName = "UserThree", GroupID = 2 } );
userList.Add( new User { UserID = 4, UserName = "UserFour", GroupID = 1 } );
userList.Add( new User { UserID = 5, UserName = "UserFive", GroupID = 3 } );
userList.Add( new User { UserID = 6, UserName = "UserSix", GroupID = 3 } );

I want to be able to run a Linq query on the above list that groups all the users by GroupID. So the out pub will be a list of user lists that contains user (if that makes sense?). So the out put would be something like:

GroupedUserList
    UserList
        UserID = 1, UserName = "UserOne", GroupID = 1
        UserID = 2, UserName = "UserTwo", GroupID = 1
        UserID = 4, UserName = "UserFour", GroupID = 1
    UserList
        UserID = 3, UserName = "UserThree", GroupID = 2
    UserList
        UserID = 5, UserName = "UserFive", GroupID = 3
        UserID = 6, UserName = "UserSix", GroupID = 3

I've tried using the groupby linq clause but this seems to return a list of keys and its not grouped by correctly:

var groupedCustomerList = userList.GroupBy( u => u.GroupID ).ToList();

Any help would be much appreciated.

Thanks

解决方案

var groupedCustomerList = userList
    .GroupBy(u => u.GroupID)
    .Select(grp => grp.ToList())
    .ToList();

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