Question

I´ve come to a total stop with my program and im in need of some help.

I got an xml file with customer billings and billing dates. This file has about 4000 billing dates. What i want is to sort them so the once that is in a range of a period date of 2010-04-01 - 2011-03-31 adds to a table column named period1. And the other dates goes to period2 that is 2011-04-01 - 2012-03-31.

Ive been testing and testing this solution in diffrent ways but it wont work. Im adding all the dats to a list named dates. And trying:

if (dates.All(date => date >= startDatePeriod1 && date <= stopDatePeriod1))
{
    adapterBonus.InsertPeriod1Query(// insert to database));
}
else if (dates.All(date => date >= startDatePeriod2 && date >= stopDatePeriod2))
{
    adapterBonus.InsertPeriod2Query(// insert to database));
}

startDatePeriod1 = 2010-04-01
stopDatePeriiod1 = 2011-03-31  

and so on

Answer 1

The Enumerable.All extension method returns true if every element in the sequence verifies the condition. If dates contains dates in both periods, none of the ifs will run, because both calls to Enumerable.All will return false.

I’m not sure what you mean by “adds to a table column named period1”, but if you mean to count all the dates in each period, use Enumerable.Count:

int period1Count = dates.Count(date => date >= startDatePeriod1 && date <= stopDatePeriod1);
int period2Count = dates.Count(date => date >= startDatePeriod2 && date <= stopDatePeriod2);
adapterBonus.InsertPeriod1Query(period1Count);
adapterBonus.InsertPeriod2Query(period2Count);