c# 权限二进制操作

   /// <summary>
    /// 位运算，二进制
    /// </summary>
    [Flags]
    public enum PermissionEnum
    {
        /// <summary>
        /// 初始化
        /// 0000
        /// </summary>
        Init = 0,
        /// <summary>
        /// 插入
        /// 0001
        /// </summary>
        Insert = 1,
        /// <summary>
        /// 删除
        /// 0010
        /// </summary>
        Delete = 2,
        /// <summary>
        /// 更新
        /// 0100
        /// </summary>
        Update = 4,
        /// <summary>
        /// 查询
        /// 1000
        /// </summary>
        Query = 8
    }

    class Program
    {

        static void Main(string[] args)
        {
            //初始化一个新增权限
            var demo = InsertPermission(PermissionEnum.Insert);
            Console.WriteLine(demo);
            //再增加一个查询权限
            demo = InsertPermission(PermissionEnum.Query, demo);
            Console.WriteLine(demo);
            //再增加一个删除权限
            demo = InsertPermission(PermissionEnum.Delete, demo);
            Console.WriteLine(demo);
            //删除一个新增权限
            demo = DeletePermission(PermissionEnum.Insert, demo);
            Console.WriteLine(demo);
            //判断是否拥有新增权限
            Console.WriteLine(GetPermission(PermissionEnum.Insert, demo));
            //判断是否拥有查询权限
            Console.WriteLine(GetPermission(PermissionEnum.Query, demo));
            Console.Read();
        }

        /// <summary>
        /// 增加权限
        /// </summary>
        /// <param name="perType">需要增加什么权限（增删改查）</param>
        /// <param name="userPer">用户原来的权限</param>
        /// <returns></returns>
        public static int InsertPermission(PermissionEnum perType, int userPer = (int)PermissionEnum.Init)
        {
            //或运算  真假 为真；
            return userPer | (int)perType;
        }
        /// <summary>
        /// 删除权限
        /// </summary>
        /// <param name="perType">需要删除什么权限（增删改查）</param>
        /// <param name="userPer">用户原来的权限</param>
        /// <returns></returns>
        public static int DeletePermission(PermissionEnum perType, int userPer = (int)PermissionEnum.Init)
        {
            //~补位，~000010 = 111101
            //&与，真真为真，真假为假
            return userPer & ~(int)perType;
        }

        /// <summary>
        /// 判断是否拥有权限
        /// </summary>
        /// <param name="perType">判断是否拥有的权限类型</param>
        /// <param name="userPer">用户原来的权限</param>
        /// <returns></returns>
        public static bool GetPermission(PermissionEnum perType, int userPer = (int)PermissionEnum.Init)
        {
            //&与，真真为真，真假为假
            //判断出来的数不等于零，那就是拥有该权限
            return (userPer & (int)perType) != 0;
        }