更新时间:2023-01-08 16:28:17
正如jdweng在评论中建议的那样,您可以执行以下操作:
As jdweng suggested in the comments you can do:
Notes.Select(x => new string[] {x.Title, x.Author}).Distinct();
,它将返回一个IEnumerable<string[]>
.
另一种选择是创建一个要选择的类:
Another option is to create a class to select into:
public class NoteSummary()
{
public string Title { get; set; }
public string Author { get; set; }
public NoteSummary(string title, string author)
{
Title = title;
Author = author;
}
}
然后linq变为:
Notes.Select(x => new NoteSummary(x.Title, x.Author)).Distinct();
返回IEnumerable<NoteSummary>
.
如果要返回原始Note
类/实体的分组集合,则可以使用GroupBy
:
If you want to return a grouped collection of the original Note
class/entity you can use GroupBy
:
Notes
.GroupBy(g => new { g.Title, g.Author }) // group by fields
.Select(g => g.First()); // select first group
返回IEnumerable<Note>
.