I have an object containing a date and a count.

 public class Stat
 {
    public DateTime Stamp {get; set;}
    public int Count {get; set ;}
 }

I have a Serie object that holds a list of thoses Stat plus some more info such as name and so on...

public class Serie
{
    public string Name { get; set; }
    public List<Stat> Data { get; set; }
    ...
}

Consider that I have a List of Serie but the series don't all contain the same Stamps. I need to fill in the missing stamps in all series with a default value.

I thought of an extension method with signature like this (please provide better name if you find one :) ) :

 public static IEnumerable<Serie> Equalize(this IEnumerable<ChartSerie> series, int defaultCount)

this question seems to treat the same problem, but when querying directly the DB. of course I could loop through the dates and create another list. But is there any more elegant way to achieve this?

i.e.:

Serie A:
01.05.2010 1
03.05.2010 3

Serie B:
01.05.2010 5
02.05.2010 6

I should get :

Serie A :
01.05.2010 1
02.05.2010 0
03.05.2010 3

Serie B:
01.05.2010 5
02.05.2010 6
03.05.2010 0