//方法一

  public string Week()

        {

            string[] weekdays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

            string week = weekdays[Convert.ToInt32(DateTime.Now.DayOfWeek)];

            return week;

        }

//方法二

 string weekstr = DateTime.Now.DayOfWeek.ToString();

            switch (weekstr)

            {

                case "Monday":

                    weekstr = "星期一";

                    break;

                case "Tuesday":

                    weekstr = "星期二";

                    break;

                case "Wednesday":

                    weekstr = "星期三";

                    break;

                case "Thursday":

                    weekstr = "星期四";

                    break;

                case "Friday":

                    weekstr = "星期五";

                    break;

                case "Saturday":

                    weekstr = "星期六";

                    break;

                case "Sunday":

                    weekstr = "星期日";

                    break;

             }