确定begindate是否是周末

Question

我需要检查来自日期选择器的所选日期是否不在周末。该函数需要继续检查新的startdate是否是一个周末。如果周末发生，它还需要在startdate中添加天数。

代码应该是这样的：

int startday = Datepicker1.SelectedDate;
if (startdate = weekendday, startdate++)
{
 startdate++ //or if a sunday +2
}
else
{
 return startdate
}

感谢您的帮助。

Answer 1

if (startdate.DayOfWeek == DayOfWeek.Saturday)
    startdate = startdate.AddDays(2);
else if (startdate.DayOfWeek == DayOfWeek.Sunday)
    startdate = startdate.AddDays(1);

Answer 2

使用DayOfWeek属性，您可以明确检查周末。像这样：

if ((startDate.DayOfWeek == DayOfWeek.Saturday) ||
    (startDate.DayOfWeek == DayOfWeek.Sunday))

当然，条件有点长。将它抽象为辅助方法可以使它更清洁：

private bool IsWeekend(DateTime date)
{
    return (date.DayOfWeek == DayOfWeek.Saturday) ||
           (date.DayOfWeek == DayOfWeek.Sunday)
}

要像这样使用：

if (IsWeekend(startDate))

或者，或许更清洁，您可以为DateTime编写扩展方法：

public static bool IsWeekend(this DateTime date)
{
    return (date.DayOfWeek == DayOfWeek.Saturday) ||
           (date.DayOfWeek == DayOfWeek.Sunday)
}

您可以这样使用：

if (startDate.IsWeekend())

Answer 3

查看DateTime.DayOfWeek记录的here。

while(startday.DayOfWeek == DayOfWeek.Saturday 
         || startday.DayOfWeek == DayOfWeek.Sunday)
{
   startday = startday.AddDays(1);
}

Answer 4

您只需使用DateTime.DayOfWeek属性即可。 来自MSDN的好例子：http://msdn.microsoft.com/en-us/library/system.datetime.dayofweek.aspx

Answer 5

查看DateTime.DayOfWeek属性 - 它将为您提供DateTime对象所在的星期几。