标志枚举的使用大多是在标记多重状态，比如说文件的属性：只读，可写，隐藏，系统文件等相关属性，都对应相应的标志位，如果在C#中想实现自己的标志枚举，也是可以的，下文是亲身试验的一段代码，希望对您有所帮助，也望您不吝赐教。

// 执行代码
private void Form1_Load(object sender, EventArgs e)
{Log.i("=========================================");StatusAttributes sa = StatusAttributes.Welcome | StatusAttributes.Login;Log.e(sa);Log.e(Convert.ToString((int)sa, 2));if ((sa & StatusAttributes.Login) == StatusAttributes.Login)Log.w("im login");// &按位与if ((sa & StatusAttributes.Meeting) != StatusAttributes.Meeting)Log.w("im not in meeting");// ^异或运算 不同则为1 相同则为0sa = sa ^ StatusAttributes.Meeting;Log.e(sa);Log.e(Convert.ToString((int)sa, 2));// ~取反Log.e(~sa);Log.e(Convert.ToString((int)~sa, 2));Log.i("=========================================");FileAttributes fa = (FileAttributes)10;Log.e(fa);if ((fa & FileAttributes.Administrator) == FileAttributes.Administrator)Log.w("created by administrator");if ((fa & FileAttributes.Hide) != FileAttributes.Hide)Log.w("file is show");FileAttributes fa2 = fa ^ FileAttributes.Hide;Log.e(fa2);if ((fa2 & FileAttributes.Readonly) != FileAttributes.Readonly)Log.w("file2 can read and write");
}

注意：a << b 的意思为：二进制的a向左移动b位

// 枚举类型
[Flags]
public enum StatusAttributes
{None = 0,Welcome = 1 << 0,Login = 1 << 1,Meeting = 1 << 2,Share = 1 << 4,Join = 1 << 8,
}
[Flags]
public enum FileAttributes
{None = 0,System = 1,Readonly = 2,Hide = 4,Administrator = 8,
}

输出结果

12-27 16:42:32.019   i   =========================================
12-27 16:42:32.023   e   Welcome, Login
12-27 16:42:32.024   e   11
12-27 16:42:32.024   w   im login
12-27 16:42:32.024   w   im not in meeting
12-27 16:42:32.024   e   Welcome, Login, Meeting
12-27 16:42:32.024   e   111
12-27 16:42:32.025   e   -8
12-27 16:42:32.025   e   11111111111111111111111111111000
12-27 16:42:32.025   i   =========================================
12-27 16:42:32.025   e   Readonly, Administrator
12-27 16:42:32.025   w   created by administrator
12-27 16:42:32.025   w   file is show
12-27 16:42:32.025   e   Readonly, Hide, Administrator

最后列出如何位运算修改标志枚举：

StatusAttributes sa = StatusAttributes.Login | StatusAttributes.Welcome;
sa = sa | StatusAttributes.Join;//添加属性
sa = sa | StatusAttributes.Share;//添加属性
sa = (sa | StatusAttributes.Share) ^ StatusAttributes.Share;//删除属性
sa = (sa | StatusAttributes.Meeting) ^ StatusAttributes.Meeting;//删除属性