DateTime currentDate = DateTime.Now.Date;int dayOfWeek = (int)currentDate.DayOfWeek;// 以星期日为第一天时,第一天为DateTime firstDay = currentDate.AddDays(-dayOfWeek);// 最后一天DateTime lastDay = firstDay.AddDays(6);
(定义星期日为一周的开始): 获取该月中是第几周 ///