C# 上周本周

DateTime dt = DateTime.Now;  //当前时间
int dayOfWeek = Convert.ToInt32(dt.DayOfWeek.ToString("d"));
DateTime weekStart = dt.AddDays(1 - ((dayOfWeek == 0) ? 7 : dayOfWeek));   //本周周一
DateTime weekEnd = weekStart.AddDays(6);  //本周周日
DateTime lastWeekStart = weekStart.AddDays(-7);  //上周周一
DateTime lastWeekEnd = weekEnd.AddDays(-7);  //上周周日