如何从对象列表的属性中提取不同的对象？

Question

I created following viewmodel for getting from my DB all the results from 3 tables in a single list:我创建了以下视图模型，用于从我的数据库中获取单个列表中 3 个表的所有结果：

public class ResultsVM
{
    public Room room { get; set; }
    public Hotel hotel { get; set; }
    public List<Picture> pictures { get; set; }
}

I'm then passing my View a list of ResultsVM然后我通过我的查看结果ResultsVM列表

@model List <ResultsVM>

Now I'm trying to extract from this list a new list with the distinct object Hotel .现在我试图从这个列表中提取一个具有不同对象Hotel的新列表。

Is there a way to achieve it with Linq or shall I make a loop and compare them one by one?有没有办法用 Linq 实现它，或者我应该做一个循环并一一比较它们？

Answer 1

Assuming that Hotel objects have unique IDs, you could get distinct hotels with this LINQ query:假设Hotel对象具有唯一 ID，您可以使用以下 LINQ 查询获得不同的酒店：

List<ResultsVM> results = ...
var hotels = results
    .Select(r => r.Hotel)
    .GroupBy(h => h.HotelId)
    .Select(g => g.First())
    .ToList();