Question

I am trying find all the users that are not in a friends user friend list using linq to sql. Right now I am comparing friendslist to all the users in the system. Theres gotta be a better way of doing this using linq to sql. Thanks for any help

// Comparing this to list to see who does not exist.
// What I would like to do is just use one statement
// to get the list of non friend users
var friends = (from x in db.FriendsLists
               where
                   (x.TheUser == GlobalVariables.User.ID) ||
                   (x.TheFriend == GlobalVariables.User.ID)
               select x).ToList();

var allUsersInSystem = (from x in db.Users select x).ToList();

Answer 1

  var friends = (from x in db.FriendsLists
                                   where
                                       (x.TheUser == GlobalVariables.User.ID) ||
                                       (x.TheFriend == GlobalVariables.User.ID)
                                   select x.UserID).ToList();

     var notInFriendList = from nf in db.Users
                where !friends.Contains(nf.UserID)
                select nf;