使用 LINQ 对对象列表进行分组 [英] Using LINQ to group a list of objects
本文介绍了使用 LINQ 对对象列表进行分组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个对象:
public class Customer
{
public int ID { get; set; }
public string Name { get; set; }
public int GroupID { get; set; }
}
我返回一个可能如下所示的列表:
I return a list that may look like the following:
List<Customer> CustomerList = new List<Customer>();
CustomerList.Add( new Customer { ID = 1, Name = "One", GroupID = 1 } );
CustomerList.Add( new Customer { ID = 2, Name = "Two", GroupID = 1 } );
CustomerList.Add( new Customer { ID = 3, Name = "Three", GroupID = 2 } );
CustomerList.Add( new Customer { ID = 4, Name = "Four", GroupID = 1 } );
CustomerList.Add( new Customer { ID = 5, Name = "Five", GroupID = 3 } );
CustomerList.Add( new Customer { ID = 6, Name = "Six", GroupID = 3 } );
我想返回一个 linq 查询,它看起来像
I want to return a linq query which will look like
CustomerList
GroupID =1
UserID = 1, UserName = "UserOne", GroupID = 1
UserID = 2, UserName = "UserTwo", GroupID = 1
UserID = 4, UserName = "UserFour", GroupID = 1
GroupID =2
UserID = 3, UserName = "UserThree", GroupID = 2
GroupID =3
UserID = 5, UserName = "UserFive", GroupID = 3
UserID = 6, UserName = "UserSix",
我尝试过
代码
var groupedCustomerList = CustomerList
.GroupBy(u => u.GroupID)
.Select(grp => grp.ToList())
.ToList();
工作但没有提供所需的输出.
works but does not give the desired output.
推荐答案
var groupedCustomerList = CustomerList.GroupBy(u => u.GroupID)
.Select(grp =>new { GroupID =grp.Key, CustomerList = grp.ToList()})
.ToList();
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