gistfile1.cs

var query = new[] {1, 2, 3, 4, 5, 6, 7}.Select(i => { 
                                                      dynamic expando = new ExpandoObject();
                                                      expando.i = i;
                                                      expando.root = () => i * i;
                                                      return expando
                                                     });

foreach(dynamic item in query){
  Console.WriteLine(item.root());
}