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c# - 比较两个日期时如何使用 DateTimePicker 说明月份的变化

问题描述

我正在尝试使用 Windows 窗体和 C# 创建一个基本的酒店房间预订应用程序。我最初是从创建 for 循环开始的，理由是到达日期总是小于出发日期。这一切都按预期进行，直到我尝试预订 6 月 30 日的房间并于 7 月 1 日离开。从下面的代码可以看出，它永远不会进入for循环，因为到达日期不小于出发日期。我创建了一个 maxDays int 来保存这个人将要停留的最大天数，并将其用作我循环的锚点。这可能归结为大多数逻辑问题和我的一些愚蠢错误，因为我几乎没有在代码中使用日期的经验。对此的任何建议都会很棒。

private void CalculateButton_Click(object sender, EventArgs e)
    {
        //Prints out number of nights at hotel.
        NumberOfNightsTextbox.Text = (DepartureDatePicker.Value.Day - ArrivalDatePicker.Value.Day).ToString("d");

        //Creates a copy of the current Arrival and Departure date.
        DateTimePicker ArrivalCopy = ArrivalDatePicker;
        DateTimePicker DepartureCopy = DepartureDatePicker;

        //Creates an int to store the current Arrival and Departure Month.
        int arrivalMonth = ArrivalDatePicker.Value.Month;
        int departureMonth = DepartureDatePicker.Value.Month;

        //Creates a int that is used to determine how many loops the For statement should loop for.
        //May need to add the monthly days after doing a check.
        int maxDays = DepartureDatePicker.Value.Day;

        //Gets the difference of the Arrival and Departure and converts it to an Int.
        double differnceD = (DepartureDatePicker.Value - ArrivalDatePicker.Value).TotalDays;
        int diff = (int)Math.Round(differnceD);

        if (arrivalMonth < departureMonth)
        {
            if (departureMonth == 1 || departureMonth == 3 ||
                departureMonth == 5 || departureMonth == 7 ||
                departureMonth == 8 || departureMonth == 10 ||
                departureMonth == 11)
            {
                diff += 31;

            }
            else if (departureMonth == 2)
            {
                diff += 28;

            }
            else if (departureMonth == 4 || departureMonth == 6 || departureMonth == 9 || departureMonth == 11)
            {
                diff += 30;

            }
        }
        if (arrivalMonth == departureMonth)
        {
            for (int i = ArrivalDatePicker.Value.Day; i < maxDays + 1; i++)
            {
                if (ArrivalCopy.Value.DayOfWeek == DayOfWeek.Saturday || ArrivalCopy.Value.DayOfWeek == DayOfWeek.Sunday)
                {
                    increasePriceNight++;
                }

                ArrivalCopy.Value = ArrivalCopy.Value.AddDays(1);
            }
        }

        TotalPriceTextbox.Text = (((diff - increasePriceNight) * 120) + (increasePriceNight * 150)).ToString("C");

        AvgPricePerNightTextbox.Text = ((((diff - increasePriceNight) * 120) + (increasePriceNight * 150)) / diff).ToString();
    }

标签： c#winformsdatetimepicker

解决方案

您有该人将待在那里的总天数。您可以将其与 AddDays 方法一起使用，以查看某一天是星期六还是星期日。例如

 for ( int i = 0; i <= maxDays; i++ )
        {
            DateTime date = ArrivalCopy.Value.AddDays( i );

            if ( date.DayOfWeek == DayOfWeek.Saturday || date.DayOfWeek == DayOfWeek.Sunday )
            {
                increasePriceNight++;
            }
        }

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