[英]group by and merge some field result in linq
我有一个类
public class Person
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
}
现在我有一个这个类的列表: List<Person> persons
;
var persons = new List<Person> {
new Person { Id = 1, LastName = "Reza", FirstName="Jenabi" },
new Person { Id = 1, LastName = "Amin", FirstName="Golmahalle"},
new Person { Id = 2, LastName = "Hamed", FirstName="Naeemaei"}
};
有没有一种方法可以按Id
分组并获取所有全名(组合名字和姓氏)的列表?
所以分组后:
var Id = results[0].Id; // Output : 1
List<string> fullNames = results[0].FullNames; // Output : "Reza Jenabi","Amin Golmahalle"
我相信这是你需要的:
var results = persons.GroupBy(x => x.Id)
.Select(x => new { Id = x.Key, FullNames = x.Select(p => $"{p.FirstName} {p.LastName}").ToList() })
.ToList();
我认为下面的代码可以帮助你:
var fff = from p in persons
group $"{p.FirstName} {p.LastName}" by p.Id into g
select new { PersonId = g.Key, FullNames = g.ToList() };
是的,您可以使用GroupBy
并Join
这些项目:
var grouped = persons.GroupBy(p => p.Id)
.Select(s => string.Join(", ", s.Select(a=> $"{a.FirstName} {a.LastName}")));
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