C＃DateTime到Int和RadCalendar

Question

我正在尝试解析RadCalendar日期并禁用事件开始日期之前的日期。

我们从数据库中获取StartDateTime，并且我想从Future StartDateTime中恢复日期，直到当前（本月）的开头。

编辑：更具体

示例：我的StartDateTime是在2014年11月，但我想要禁用该未来日期的所有日期，直到回到当前月的开头（本月是2014年8月）。

以下是我们目前拥有的代码，但它只回顾i＆lt; 31.这就是为什么我想将DateTime作为一个int的天数一直回到当月的开头（第一个）。

 if (nextAvailableTime != null && nextAvailableTime.StartDateTime > DateTime.Today)
        {
            //DISABLE dates prior to next available date
            DateTime dt = nextAvailableTime.StartDateTime.AddDays(-1);
            for (var i = 0; i < 31; i++) //Would like to change this to beginning of current month.
            {
                tkCalendar.SpecialDays.Add(new RadCalendarDay(tkCalendar) { Date = dt.Date.AddDays(i * -1), IsDisabled = true, IsSelectable = false });
            }
        }

Answer 1

为什么不减去2个日期并获得天数差异？我使用自己的变量，因为我不清楚你的变量是什么。我的循环禁用前进而不是乘以-1。您可能需要将循环编辑为＆lt; =或从1开始，具体取决于您是否要包含第一个和最后一个日期。

if (nextAvailableTime != null && nextAvailableTime.StartDateTime > DateTime.Today)
  {
        //DISABLE dates prior to next available date
        DateTime currentDate = DateTime.Now;
        DateTime futureDate = DateTime.Now.AddMonths(3);
        int daysBetween = (futureDate - currentDate).Days;
        for (var i = 0; i <  daysBetween; i++) 
        {
            tkCalendar.SpecialDays.Add(new RadCalendarDay(tkCalendar) { Date =  currentDate.AddDays(i), IsDisabled = true, IsSelectable = false });
        }
   }

Answer 2

我们提出的答案是获取下一个可用日期，然后是当月的开始日期，并使用DayOfYear获取差异。

解决方案如下：

  if (nextAvailableTime != null && nextAvailableTime.StartDateTime > DateTime.Today)
        {

       //DISABLE dates prior to next available date
           DateTime dt = nextAvailableTime.StartDateTime.AddDays(-1);
           DateTime nextDate = nextAvailableTime.StartDateTime;
        //Gate the calendar to just go get the product's next available date and then get block out everything until the beginning of the current month.
            var now = DateTime.Now;
            var startOfMonth = new DateTime(now.Year, now.Month, 1);

          TimeSpan daysBetween = (futureDate - startOfMonth);
           //  for (var i = 0; i < 31; i++)//Original from 31 days from next available.
            for (var i = 0; i < daysBetween.Days; i++) //Get difference between next available and beginning of current month.
                {
                   tkCalendar.SpecialDays.Add(new RadCalendarDay(tkCalendar) { Date = dt.Date.AddDays(i * -1), IsDisabled = true, IsSelectable = false });
                }
        }