根据日期计算星期

 public string Week { get; set; }

        public string CalculateWeek(string time)

        {

            DateTime time1 = Convert.ToDateTime(time);

            string time2 = time1.DayOfWeek.ToString();

            switch (time2)

            {

                case "Monday":

                    Week = "星期一";

                    break;

                case "Tuesday":

                    Week = "星期二";

                    break;

                case "Wednesday":

                    Week = "星期三";

                    break;

                case "Thursday":

                    Week = "星期四";

                    break;

                case "Friday":

                    Week = "星期五";

                    break;

                case "Saturday":

                    Week = "星期六";

                    break;

                case "Sunday":

                    Week = "星期日";

                    break;

            }

            return Week;

        }