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copied!<p>Based on a (total) guess of what you're trying to do here:</p> <pre><code>public class Program { static void Main(string[] args) { TestDateRange(DateTime.Today, DateTime.Today.AddMonths(1)); } Dictionary<DateTime, List<string>> bookings; int maxOccupancy = 2; public Program(int year = 2011) { bookings = getDateRange(new DateTime(year, 1, 1), new DateTime(year,12,31)).ToDictionary(day => day, day => new List<string>()); } private static void TestDateRange(DateTime startDate, DateTime endDate) { Program p = new Program(); if (p.GetFullDaysInDateRange(startDate, endDate).Count() == 0) { string bookingName = "Booking for test"; p.AddBooking(startDate, endDate, bookingName); } } private IEnumerable<DateTime> getDateRange(DateTime startDate, DateTime endDate) { if (startDate > endDate) { return null; } return Enumerable.Range((int)startDate.ToOADate(), endDate.Subtract(startDate).Days).Select(day => DateTime.FromOADate(day)); } private void AddBooking(DateTime startDate, DateTime endDate, string name) { IEnumerable<DateTime> range = getDateRange(startDate, endDate); foreach (DateTime date in range) { if (bookings[date].Contains(name)) return; //already placed this booking if (bookings[date].Count > maxOccupancy) throw new Exception(String.Format("Cannot book on {0}: full", date)); bookings[date].Add(name); } } public IEnumerable<DateTime> GetFullDaysInDateRange(DateTime startDate, DateTime endDate) { IEnumerable<DateTime> testRange = getDateRange(startDate, endDate); List<DateTime> bookedDays = new List<DateTime>(); foreach (DateTime date in testRange) { if (bookings[date].Count > maxOccupancy) bookedDays.Add(date); } return bookedDays; } } </code></pre>

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