Comment garder compter entre les temps spécifiques entre deux dates

Je trouve votre code assez difficile à mantiner (si vous souhaitez ajouter un quatrième repas à l'avenir, ce serait un cauchemar de changer votre code), donc je vous donne une approche différente, ainsi que de répondre Votre question.

Tout d'abord, je définirais une classe comme celle-ci: p> xxx pré>

alors, je voudrais simplement instancier la classe et appeler les fonctions: p>

void Main(string[] args)
{
   CalculateMeals(new DateTime(2019, 1, 1, 15, 12, 1), new DateTime(2019, 1, 2, 18, 0, 0));
}

public static void CalculateMeals(DateTime timeArrived, DateTime timeExit)
{
   // Number of full days
   int fullDaysNumber = (timeExit - timeArrived).Days;
   DayMeals dayMeals = new DayMeals(true);
   for (int i = 0; i <= fullDaysNumber; i++)
   {
       int hoursDiff = (int)(timeExit - timeArrived).TotalHours;
       if (timeExit.Day > timeArrived.Day && hoursDiff > 24)
       {
           dayMeals.AddFullDay();
           // A trick to make the cycle work the next time
           // You can use a different variable if you want to keep timeArrived unchanged
           timeArrived = timeArrived.AddDays(1);
       }
       else if (timeExit.Day < timeArrived.Day)
       {
           break;
       }
       else
       {
           if (timeArrived.Day != timeExit.Day)
           {
               dayMeals.CountMealsForADay(timeArrived, new DateTime(1,1,timeArrived.Day,23,59,59));
               dayMeals.CountMealsForADay(new DateTime(1,1,timeExit.Day,0,0,1), timeExit);
           }
           else
           {
               dayMeals.CountMealsForADay(timeArrived, timeExit);
           }    
       }
   }

   dayMeals.PrintMealsCount();
}

Vous allez, sans boucler. J'ai simplifié plus loin en utilisant uniquement des objets C # standard. L'astuce consiste à compter les jours complets et à travailler avec TimesPans. XXX

Je n'ai pas vérifié cela dans VS, mais quelque chose comme ça devrait fonctionner. J'ai copié votre code le même jour, en supposant également que c'est correct aussi:

public class MealCalculation
    {
        int countA, countB, countC = 0;
        int total = 0;
        public void Calculate()
        {

            var start = DateTime.Now;
            var finish = DateTime.Now;

            // Same Day
            if (start.Date == finish.Date)
            {
                MealsCalculate(start.Hour, start.Hour);
            }
            // Next Day
            else if (start.AddDays(1).Date == finish.Date)
            {
                MealsCalculate(start.Hour, 24);
                MealsCalculate(0, finish.Hour);
            }
            // Great Than 1 Day
            else
            {
                // First Day
                MealsCalculate(start.Hour, 24);

                // Middle Full Days
                var days = NumberOfDays(start.Date, finish.Date);
                countA += days;
                countB += days;
                countC += days;

                // Finish Day
                MealsCalculate(0, finish.Hour);
            }

            // Total
            total = countA + countB + countC;

        }
        public int NumberOfDays(DateTime start, DateTime finish)
        {
            var days = 0;
            while (start < finish)
            {
                start.AddDays(1);
                days++;
            }
            return days - 1;
        }


        public void MealsCalculate(int totalHoursArrived, int totalHoursExit)
        {
            if (totalHoursArrived <= 8 && totalHoursExit >= 17) //if date is before or on 8AM and leaves on or after 5PM.
            {
                countA += 1;
                countB += 1;
                countC += 1;
            }
            else if (totalHoursArrived <= 8 && (totalHoursExit >= 12 && totalHoursExit < 17)) //if date is before or on 8AM and leaves before 5PM
            {
                countA += 1;
                countB += 1;
            }
            else if (totalHoursArrived <= 8 && totalHoursExit < 12) //if date is before or on 8AM and leaves before 12PM
            {
                countA += 1;
            }
            else if ((totalHoursArrived <= 12 && totalHoursArrived > 8) && totalHoursExit >= 17) //if date is before or on 12PM and leaves on or after 5PM
            {
                countB += 1;
                countC += 1;
            }
            else if ((totalHoursArrived <= 12 && totalHoursArrived > 8) && totalHoursExit < 17) //if date is before or on 12PM and leaves before 5PM
            {
                countB += 1;
            }
            else if (totalHoursArrived >= 17) //if date is after or on 5PM
            {
                countC += 1;
            }
        }

    }