//本周是本年第几周
private int DatePart(System.DateTime dt) { int weeknow = Convert.ToInt32(dt.DayOfWeek);//今天星期几 int daydiff = (-1) * (weeknow+1);//今日与上周末的天数差 int days = System.DateTime.Now.AddDays(daydiff).DayOfYear;//上周末是本年第几天 int weeks = days/7; if(days%7 != 0) { weeks++; } //此时,weeks为上周是本年的第几周 return (weeks+1); }
//本周起止日期
private string WeekRange(System.DateTime dt) { int weeknow = Convert.ToInt32(dt.DayOfWeek); int daydiff = (-1) * weeknow; int dayadd = 6-weeknow; string dateBegin = System.DateTime.Now.AddDays(daydiff).Date.ToString("MM月dd日"); string dateEnd = System.DateTime.Now.AddDays(dayadd).Date.ToString("MM月dd日"); return dateBegin + " - " +dateEnd; } 
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