c# linq group by fortnight or x number of days? - asp.net

Question

Hi I'm trying to work out how would you group items into the first and 2nd half of each month for a given year and month?
i.e.
Say for example I have to list the name of item on the 6th of every month and the 15th of every month.
say for example I have
Flight Name Flight Date
Flight 1 01/07/2012
Flight 2 12/07/2012
Flight 3 18/07/2012
Flight 4 28/07/2012
how would i split it up so I'd like to group flights by fortnights within a year/month
i.e
Flights For July week 1 and 2 - 2012
Flights for July week 3 and 4 - 2012
so this is what I have so far..
eventually it'll have to be some kind of view model using automapper etc i am not sure as of yet how it'd get that neatly into some kind of ViewModel form...
var flightEntities = from f in flightsAsViewModels
select new
{
YearGroups = from flightYearGroup in context.Flights
group flightYearGroup by flightYearGroup.FlightDateTime.Year
into yearGroup
orderby yearGroup.Key descending
select new
{
Year = yearGroup.Key,
MonthGroups = from flightMonthGroup in yearGroup
group flightMonthGroup by flightMonthGroup.FlightDateTime.Month
into monthGroup
orderby monthGroup.Key ascending
select new {
Month = monthGroup.Key,
HalfMonthGroups = from months in monthGroup
group months by (months.FlightDateTime.Day <= 15 ? 1 : 2) into splitMonthFlights
orderby splitMonthFlights.Key
select new { WhichHalfOfMonth = splitMonthFlights.Key, Flights = splitMonthFlights }
}
}
};

Answer 1

I hereby pasted Linq code for the requirement. But not sure, this still can be achievable in shortest way. Please let me know if so.
var monthGroupedDates = from d in dates
group d by d.Month into fd
select new { Month = fd.Key, Dates = fd };
foreach (var g in monthGroupedDates)
{
var groupByHalf = from n in g.Dates
group n by (n.Day <= 15 ? 1 : 2) into gd
orderby gd.Key
select new { WhichHalf = gd.Key, Dates = gd };
foreach (var gh in groupByHalf)
{
string printString = (gh.WhichHalf == 1 ? "First" : "Second") + " week dates are:";
foreach (var h in gh.Dates)
{
printString += h.ToString("dd/MM/yyyy") + ";";
}
Console.WriteLine(printString);
}
}
Please note, dates are one which is mentioned in your requirement. If its Linq with SQL, this may need slight alterations.
Raj