C#枚举类型用户标志位

C#枚举类型用于标志位，可以进行与和或操作

enum Mammalia
{
   Bison  =   1,
   Human  =   2,
   Mammal = 255
}
	
public class MammalCheck
{
   public static void Main( )
   {
      //Mammalia pattern = Mammalia.Mammal;
      Mammalia pattern = Mammalia.Bison | Mammalia.Human;
      Mammalia animal  = Mammalia.Bison;
 
      if ( (pattern & animal) != 0)
      { 
         Console.WriteLine ("{0} is a member of ({1}).", 
              animal, pattern);
      }
   }		
}