/// <summary> /// 获取本周的周一日期 /// </summary> /// <returns></returns> public string GetThisWeekMonday() { DateTime date = DateTime.Now; DateTime firstDate = System.DateTime.Now; switch (date.DayOfWeek) { case System.DayOfWeek.Monday: firstDate = date; break; case System.DayOfWeek.Tuesday: firstDate = date.AddDays(-1); break; case System.DayOfWeek.Wednesday: firstDate = date.AddDays(-2); break; case System.DayOfWeek.Thursday: firstDate = date.AddDays(-3); break; case System.DayOfWeek.Friday: firstDate = date.AddDays(-4); break; case System.DayOfWeek.Saturday: firstDate = date.AddDays(-5); break; case System.DayOfWeek.Sunday: firstDate = date.AddDays(-6); break; } return firstDate.ToString("D"); }