enum

enum DayOfWeek : byte{    Monday = 1,    Tuesday,    Wednesday,    Thursday,    Friday,    Saturday,    Sunday}// DayOfWeek.FridayDayOfWeek myday = DayOfWeek.Friday;   // c# 自带byte b = (byte) myday;string s = myday.toString();// get int DateTime dt = new DateTime();int m = (int)(dt.DayOfweek) // get enum form string enum direction : byte{    north = 1,    south,    east,    west} string directStr = "north";direction mydir = (direction)Enum.Parse(typeof(diection),directStr);////////////////////////////////////////////////ASCIIEncoding.UTF8      .......ASCII, Unicode