Question

var com = from exam1 in timeTable.Exams
          from exam2 in timeTable.Exams
          where (exam1 != exam2)
          select new List<Exam> { exam1, exam2 };

timeTable is a list of Exams

How can i get com to be distinct no matter what the order of the exams are that it contains. I think it is doing permutations now i need only distinct combinations.

Answer 1

var exams = timeTable.Exams.ToList();

var com = exams.Select(x => exams.Where(y => exams.IndexOf(y) > exams.IndexOf(x))
    .Select(z => new List<Exam> {x, z}))
    .SelectMany(x => x);