获取本周的周一和周日

        // 获取本周的周一
        public string GetThisWeekMonday()
        {
            DateTime date = DateTime.Now;
            DateTime first = System.DateTime.Now;
            switch (date.DayOfWeek)
            {
                case System.DayOfWeek.Monday:
                    first = date;
                    break;
                case System.DayOfWeek.Tuesday:
                    first = date.AddDays(-1);
                    break;
                case System.DayOfWeek.Wednesday:
                    first = date.AddDays(-2);
                    break;
                case System.DayOfWeek.Thursday:
                    first = date.AddDays(-3);
                    break;
                case System.DayOfWeek.Friday:
                    first = date.AddDays(-4);
                    break;
                case System.DayOfWeek.Saturday:
                    first = date.AddDays(-5);
                    break;
                case System.DayOfWeek.Sunday:
                    first = date.AddDays(-6);
                    break;
            }
            return first.ToString("yyyy-MM-dd");
        }


        // 获取本周的周日
        public string GetThisWeekSunday()
        {
            DateTime date = DateTime.Now;
            DateTime last = System.DateTime.Now;
            switch (date.DayOfWeek)
            {
                case System.DayOfWeek.Monday:
                    last = date.AddDays(6);
                    break;
                case System.DayOfWeek.Tuesday:
                    last = date.AddDays(5);
                    break;
                case System.DayOfWeek.Wednesday:
                    last = date.AddDays(4);
                    break;
                case System.DayOfWeek.Thursday:
                    last = date.AddDays(3);
                    break;
                case System.DayOfWeek.Friday:
                    last = date.AddDays(2);
                    break;
                case System.DayOfWeek.Saturday:
                    last = date.AddDays(1);
                    break;
                case System.DayOfWeek.Sunday:
                    last = date;
                    break;
            }
            return last.ToString("yyyy-MM-dd");
        }