public class ConsolidatedChild
{
public string School { get; set; }
public string Friend { get; set; }
public string FavoriteColor { get; set; }
public List<Child> Children { get; set; }
}
public class Child
{
public string School { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public string Friend { get; set; }
public string Mother { get; set; }
public string FavoriteColor { get; set; }
}
위의 두 클래스를 사용하여 만들 수 있는 점을 고려할 때, LINQ List< ConsolidatedChild> 하고 싶다. , 학교, 친구이자 파보리테코로 그룹화하여 Child> List< 에서 다음과 같이 정의한다. Linq? 로만스였나 가능합니다.
이 코드는 desktopplatforms 속성를 무시하시겠습니까 설정되었습니다 기록되었으므로 그냥 질문이예요 데 도움이 될 것입니다
쉽냐구요:
var consolidatedChildren =
from c in children
group c by new
{
c.School,
c.Friend,
c.FavoriteColor,
} into gcs
select new ConsolidatedChild()
{
School = gcs.Key.School,
Friend = gcs.Key.Friend,
FavoriteColor = gcs.Key.FavoriteColor,
Children = gcs.ToList(),
};
var consolidatedChildren =
children
.GroupBy(c => new
{
c.School,
c.Friend,
c.FavoriteColor,
})
.Select(gcs => new ConsolidatedChild()
{
School = gcs.Key.School,
Friend = gcs.Key.Friend,
FavoriteColor = gcs.Key.FavoriteColor,
Children = gcs.ToList(),
});
주어진 목록:
var list = new List<Child>()
{
new Child()
{School = "School1", FavoriteColor = "blue", Friend = "Bob", Name = "John"},
new Child()
{School = "School2", FavoriteColor = "blue", Friend = "Bob", Name = "Pete"},
new Child()
{School = "School1", FavoriteColor = "blue", Friend = "Bob", Name = "Fred"},
new Child()
{School = "School2", FavoriteColor = "blue", Friend = "Fred", Name = "Bob"},
};
쿼리는 다음과 같습니다.
var newList = list
.GroupBy(x => new {x.School, x.Friend, x.FavoriteColor})
.Select(y => new ConsolidatedChild()
{
FavoriteColor = y.Key.FavoriteColor,
Friend = y.Key.Friend,
School = y.Key.School,
Children = y.ToList()
}
);
테스트 코드:
foreach(var item in newList)
{
Console.WriteLine("School: {0} FavouriteColor: {1} Friend: {2}", item.School,item.FavoriteColor,item.Friend);
foreach(var child in item.Children)
{
Console.WriteLine("\t Name: {0}", child.Name);
}
}
결과:.
School: School1 FavouriteColor: blue Friend: Bob
Name: John
Name: Fred
School: School2 FavouriteColor: blue Friend: Bob
Name: Pete
School: School2 FavouriteColor: blue Friend: Fred
Name: Bob