在写代码之余，把写代码过程比较好的一些代码段收藏起来，下面的代码是关于C#枚举类型用户标志位的代码，应该能对各位朋友有用处。

enum Mammalia
{
   Bison  =   1,
   Human  =   2,
   Mammal = 255
}

public class MammalCheck
{
   public static void Main( )
   {
      Mammalia pattern = Mammalia.Bison | Mammalia.Human;
      Mammalia animal  = Mammalia.Bison;

      if ( (pattern & animal) != 0)
      { 
         Console.WriteLine ("{0} is a member of ({1}).", 
              animal, pattern);
      }
   }        
}