Use LINQ to concatenate multiple rows into single row (CSV property)

Question

I\'m looking for the LINQ equivalent to the Sybase\'s LIST() or MySQL\'s group_concat()

It\'ll convert:

User  Hobby
--------------
Bob   Football 
Bo         


        

Answer 1

To do it in one Linq Statement. There is no way I'd recommend the code, but it shows that it could be done.

            var groupedUsers = from user in users
                           group user by user.User into userGroup
                           select new
                           {
                               User = userGroup.Key,
                               userHobies =
                                   userGroup.Aggregate((a, b) => 
                                       new { User = a.User, Hobby = (a.Hobby + ", " + b.Hobby) }).Hobby
                           }
                            ;
        foreach (var x in groupedUsers)
        {
            Debug.WriteLine(String.Format("{0} {1}", x.User, x.userHobies));
        }