本文共 3491 字，大约阅读时间需要 11 分钟。

public enum Equipment{
       刀,    枪,    箭,    弓}public sealed class Player{
       internal Equipment equipmentState;//用于描述角色可以使用哪些武器   //......其它成员}

namespace UsageOfFlagsAttribute{
       [Flags]    public enum Equipment    {
           NONE = 0x0000,        刀 = 0x0001,        枪 = 0x0002,        箭 = 0x0004,        弓 = 0x0008    }    public sealed class Player    {
           internal Equipment equipmentState;//用于描述角色可以使用哪些武器    }    class Program    {
           static void Main(string[] args)        {
               Player player = new Player();            player.equipmentState = Equipment.刀 | Equipment.弓;  //可以表示成多种状态的集合        }    }}

用Flags标记后也就可以按位计算了，一般枚举有3种按位计算。

按位或（“|”）：将指定的符号加入到枚举实例中

按位与（”&“）：判断枚举实例中是否有指定的符号

异或（”^“）：删除枚举实例中指定的符号

class Program    {
           static void Main(string[] args)        {
               Player player = new Player();            //按位或            player.equipmentState = Equipment.刀;            player.equipmentState = player.equipmentState | Equipment.弓;            Console.WriteLine(player.equipmentState.ToString());//打印结果：刀,弓            //按位与            player.equipmentState = Equipment.刀 | Equipment.弓;            player.equipmentState = player.equipmentState & Equipment.刀;            Console.WriteLine(player.equipmentState.ToString());  //打印结果 ： 刀            //异或            player.equipmentState = Equipment.刀 | Equipment.弓;            player.equipmentState = player.equipmentState ^ Equipment.弓;            Console.WriteLine(player.equipmentState.ToString());  //打印结果 ： 刀            Console.ReadKey();        }    }

但是每次都要写 player.equipmentState = player.equipmentState ^ Equipment.弓; 这么赋值代码的可读性不好，而且容易浪费时间。因此可以扩展方法来封装这些操作。

public static class EnumExtendMethods    {
           /// 
        /// 判断位标致的枚举实例中是否有指定符号        /// 
        /// 实例        /// 指定的符号        /// 
           public static bool Contains(this Equipment equipment,Equipment checkState)        {
               if (checkState == 0)            {
                   throw new ArgumentOutOfRangeException("checkState", "不能为NONE");            }            return (equipment & checkState) == checkState;        }        /// 
        /// 将指定的符号从枚举实例中移除        /// 
        ///         /// 指定要移除的符号        /// 
           public static Equipment Remove(this Equipment equipment, Equipment removeState)        {
               return equipment ^ removeState;        }        /// 
        /// 向枚举实例中加入指定的符号        /// 
        ///         ///         /// 
           public static Equipment Append(this Equipment equipment, Equipment addState)        {
               return equipment | addState;        }    }

现在可以这样调用了

class Program    {
           static void Main(string[] args)        {
               Player player = new Player();            //按位或            player.equipmentState = Equipment.刀;            player.equipmentState = player.equipmentState.Append(Equipment.弓);            Console.WriteLine(player.equipmentState.ToString());//打印结果：刀,弓            //按位与            player.equipmentState = Equipment.刀 | Equipment.弓;            if (player.equipmentState.Contains(Equipment.刀))            {
                   Console.WriteLine(player.equipmentState.ToString());  //打印结果 ： 刀,弓            }            //异或            player.equipmentState = Equipment.刀 | Equipment.弓;            player.equipmentState = player.equipmentState.Remove(Equipment.弓);            Console.WriteLine(player.equipmentState.ToString());  //打印结果 ： 刀            Console.ReadKey();        }    }

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