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C#获取本周第一天和最后一天

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10/28
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DateTime nowTime = DateTime.Now;
#region 获取本周第一天
//星期一为第一天
int weeknow = Convert.ToInt32(nowTime.DayOfWeek); //因为是以星期一为第一天，所以要判断weeknow等于0时，要向前推6天。
weeknow = (weeknow == ? ( - ) : (weeknow - ));
int daydiff = (-) * weeknow; //本周第一天
DateTime FirstDay = nowTime.AddDays(daydiff);
#endregion #region 获取本周最后一天
//星期天为最后一天
int lastWeekDay = Convert.ToInt32(nowTime.DayOfWeek);
lastWeekDay = lastWeekDay == ? ( - lastWeekDay) : lastWeekDay;
int lastWeekDiff = ( - lastWeekDay); //本周最后一天
DateTime LastDay = nowTime.AddDays(lastWeekDiff); #endregion