取得上周开始日期和结束日期算法

int nWeek = (int)DateTime.Today.DayOfWeek; 
nWeek = (nWeek == 0) ? 7 : nWeek;
DateTime dateStart = DateTime.Today.AddDays(1 - nWeek - 7); 
DateTime dateEnd = DateTime.Today.AddDays(-nWeek);

Response.Write(dateStart + "<br/>" + dateEnd);