根据日期获取该日期是星期几

DateTime dt = DateTime.Now;
DateTime startWeek = dt.AddDays(1 - Convert.ToInt32(dt.DayOfWeek.ToString("d")));

var count =0;//自己定义的变量 循环 

System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.GetDayName(startWeek.AddDays(count).DayOfWeek)//获取这个日期星期几