How to use LINQ to select into an object?

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I have data that looks like so:

UserId   |  SongId
--------   --------
1          1
1          4
1          12
2          95

I also have the following class:

class SongsForUser
{
    public int User;
    public List<int> Songs;
}

What I would like to do is use LINQ to select from my data to create a collection of SongsForUser objects. Below is what I have come up with so far:

var userCombos = songs.UserSongs.Select(x => new SongsForUser() { User = x.UserId, 
                                                                  Songs = /*What goes here?*/ });

How would I go about populating my Songs List?

So the result should be two SongsForUser objects. For user 1 it would have 3 items in the Songs list. For user 2 it would have 1 item in the Songs list.

linq-to-entities linq .net c#
4 Answers

In its simplest form you can just:

List<MapPoint> points = db.PropertyResearches.Where(a => a.deptId == 66).Select(x => new MapPoint { property = x.notes.Substring(0, 10), latitude = x.lat, longitude = x.@long }).ToList();
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