///-------------------------------------------------------------------------------------------------
/// <summary>
/// A DateTime extension method that query if 'date' is day off. The days off is configured
/// using the Add-calendar event methods.
/// </summary>
///
/// <param name="date"> The date. </param>
///
/// <returns> True if day off, false if not. </returns>
///
/// <example>
/// <code>
/// // LINQ example.
/// var starting = new DateTime(2018, 1, 1);
/// var ending = new DateTime(2018, 12, 31);
/// var allDates = Enumerable.Range(0, 1 + ending.Subtract(starting).Days).Select(i=> starting.AddDays(i));
///
/// CalendarDateTime.AddYearlyDateEvent("theDate", true, 6, 10, false, false);
/// var result = allDates.Where(d => d.IsDayOff());
/// // result = [0] = {6/10/2018 12:00:00 AM}
/// </code>
/// </example>
///-------------------------------------------------------------------------------------------------
public static bool IsDayOff(this DateTime date)
{
date = date.Date;
var p = YearlyEventsDictionary.Any(v => v.Value.DayOff && v.Value.Date(date.Year) == date);
var m = MonthlyEventsDictionary.Any(v => v.Value.DayOff && v.Value.Date(date.Year, date.Month) == date);
var w = WeeklyEventsDictionary.Any(v => v.Value.DayOff && v.Value.IsEventDay(date));
var a = DateEventsDictionary.Any(v => v.Value.DayOff && v.Value.Date == date);
return(p || m || w || a);
}
