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#region
/// <summary>
/// 获取是第几周
///
</summary>
/// <param name="dt"></param>
/// <param name="ci"></param>
///
<returns></returns>
public static int WeekOfYear(DateTime
dt)
{
int weeknow =
Convert.ToInt32(dt.DayOfWeek);//今天星期几
int daydiff = (-1) *
(weeknow + 1);//今日与上周末的天数差
int days =
System.DateTime.Now.AddDays(daydiff).DayOfYear;//上周末是本年第几天
int
weeks = days / 7;
if (days % 7 != 0)
{
weeks++;
}
//此时，weeks为上周是本年的第几周
return (weeks + 1);
}
#endregion