public static int GetPeriodId(this DateTime period)
{
var periods = GetPeriods();
PeriodModel periodModel = periods.FirstOrDefault(x => x.Month == period.Month && x.Year == period.Year);
if (periodModel == null)
{
throw new ArgumentException("Не удается найти период для даты {0}", period.ToString("dd.MM.yyyy"));
}
return(periodModel.Id);
}
public static PeriodModel Next(this IEnumerable <PeriodModel> periods, PeriodModel current)
{
var last = periods.Last();
if (last.Year == current.Year && last.Month == current.Month)
{
return(last);
}
var year = current.Year;
var month = current.Month;
if (month == 12)
{
year = year + 1;
month = 1;
}
else
{
month = month + 1;
}
return(periods.Single(period => period.Year == year && period.Month == month));
}
public static PeriodModel Previous(this IEnumerable <PeriodModel> periods, PeriodModel current)
{
var first = periods.First();
if (first.Year == current.Year && first.Month == current.Month)
{
return(first);
}
var year = current.Year;
var month = current.Month;
if (month == 1)
{
year = year - 1;
month = 12;
}
else
{
month = month - 1;
}
return(periods.Single(period => period.Year == year && period.Month == month));
}