C＃while循环涉及DateTime变量不执行计算

Question

我目前正在开发一个利用DateTime变量查找各种日期之间旅行费用的项目。大多数点击事件都会触发，但总价和平均价格的计算不会运行。任何帮助将不胜感激。

以下是代码：

private void btnCalculate_Click(object sender, EventArgs e)
        {
            DateTime arrival = DateTime.Parse(txtArrivalDate.Text);
            DateTime departure = DateTime.Parse(txtDepartureDate.Text);                      
            TimeSpan numDays = departure - arrival;
            int ndays = numDays.Days;
            txtNights.Text = ndays.ToString();
            decimal totalPrice = 0;
             txtTotalPrice.Text = totalPrice.ToString("c");
            decimal avprice = totalPrice / ndays;
             txtAvgPrice.Text = avprice.ToString("c");
            DateTime nightToCharge = arrival;
            decimal pricePerNight = 0m;
            int i = ndays;
            while (i > 0)
            {
                DayOfWeek dayOfweek = nightToCharge.DayOfWeek;
                if (dayOfweek == DayOfWeek.Friday ||
                    dayOfweek == DayOfWeek.Saturday)
                {
                    pricePerNight = 150m;
                }
                else
                {
                    pricePerNight = 120m; 
                }
                i--;
                nightToCharge = nightToCharge.AddDays(1);
                totalPrice += pricePerNight;
            }

        }

Answer 1

您的价格未被显示，因为您在计算价格之前设置了TextBox文本的值。您还需要在计算总金额之前设置平均价格。

只需计算平均值并在while循环后分配价格值：

while (i > 0)
{
    // Code omitted for brevity
}

decimal avprice = totalPrice / ndays;
txtTotalPrice.Text = totalPrice.ToString("c");
txtAvgPrice.Text = avprice.ToString("c");