C# Caching.CacheItem类代码示例

 public LogonResultForm GetUserInfo(string userid)
 {
     var mapper = Common.GetMapperFromSession();
     UserDao userdao = new UserDao(mapper);
     var user = userdao.Query(new UserQueryForm { Name = userid }).FirstOrDefault();
     if (user == null) throw new Exception("用户：" + userid + "在系统中不存在！");
     if (user.Enabled == 0) throw new Exception("该用户已被禁用，请联系管理员！");
     LogonResultForm result = new LogonResultForm();
     UserInfoDao userInfoDao = new UserInfoDao(mapper);
     RoleDao roleDao = new RoleDao(mapper);
     LogonHistoryDao historyDao = new LogonHistoryDao(mapper);
     string token = Guid.NewGuid().ToString().Replace("-", "");
     var userinfo = userInfoDao.Query(new UserInfoQueryForm { ID = user.ID }).FirstOrDefault();
     UserEntireInfo u = new UserEntireInfo { User = user };
     if (userinfo != null) u.UserInfo = userinfo;
     u.Role = roleDao.QueryRoleByUserID(u.User.ID);
     CacheItem item = new CacheItem(token, u);
     LogonHistory history = new LogonHistory
     {
         LogonTime = DateTime.Now,
         Token = token,
         UserID = user.ID,
         ActiveTime = DateTime.Now,
     };
     historyDao.Add(history);
     result.token = token;
     result.UserInfo = userinfo;
     cache.AddItem(item, 30 * 60);
     MenuBLL menubll = new MenuBLL();
     result.Menu = menubll.GetCurrentUserMenu(result.token);
     return result;
 }

        void IDnsCache.Set(string key, byte[] bytes, int ttlSeconds)
        {
            CacheItem item = new CacheItem(key, bytes);
            CacheItemPolicy policy = new CacheItemPolicy {AbsoluteExpiration = DateTimeOffset.Now + TimeSpan.FromSeconds(ttlSeconds)};

            _cache.Add(item, policy);
        }

        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="key"></param>
        /// <param name="obj"></param>
        public void Add(string key, object obj)
        {
            var cacheItem = new CacheItem(GeneralKey(key), obj);

            var cacheItemPolicy = new CacheItemPolicy();
            cache.Add(cacheItem, cacheItemPolicy);
        }

		public void AddItem(CacheItem item, double span)
		{
			CacheItemPolicy cp = new CacheItemPolicy();
			cp.SlidingExpiration.Add(TimeSpan.FromMinutes(span));

			cache.Add(item, cp);
		}

        public void Add(TenantInstance instance, Action<string, TenantInstance> removedCallback)
        {
            if (instance == null)
            {
                throw new ArgumentNullException("instance");
            }

            if (removedCallback == null)
            {
                removedCallback = delegate { };
            }

            // Add a cache entry for the instance id that will be used as a cache dependency
            // for the running instances
            var cacheDependencyPolicy = new CacheItemPolicy
            {
                // Make the "MaxAge" configurable - when the dependency is removed so are the instances
                AbsoluteExpiration = DateTimeOffset.UtcNow.AddHours(12)
            };

            var cacheDependency = new CacheItem(instance.Id.ToString(), instance.Id);

            // We need to add the dependency before we set up the instance change monitors,
            // otherwise they'll be removed from the cache immediately!
            cache.Set(instance.Id.ToString(), instance.Id, cacheDependencyPolicy);

            // Now cache the running instance for each identifier
            // The policies must be unique since the RemovedCallback can only be called once-per-policy
            foreach (var id in instance.Tenant.RequestIdentifiers)
            {
                cache.Set(new CacheItem(id, instance), GetCacheItemPolicy(removedCallback, cacheDependency));
            }
        }

 public override CacheItem AddOrGetExisting(CacheItem item, CacheItemPolicy policy)
 {
     if (item == null)
     {
         throw new ArgumentNullException("item");
     }
     return new CacheItem(item.Key, this.AddOrGetExistingInternal(item.Key, item.Value, policy));
 }

 /// <summary>
 /// Adds principal to cache
 /// </summary>
 /// <param name="principal">principal to add to cache</param>
 public void AddPrincipalToCache(IJumbleblocksPrincipal principal)
 {
     if (principal != null)
     {
         var cacheItem = new CacheItem(principal.Identity.Name, principal);
         Cache.Add(cacheItem, _defaultCachePolicy);
     }
 }

 public override CacheItem AddOrGetExisting(CacheItem item, CacheItemPolicy policy)
 {
     var instance = GetCacheItem(item.Key);
     if (instance != null)
         return instance;
     Set(item, policy);
     return item;
 }

 /// <summary>
 /// 向缓存中设置缓存项
 /// </summary>
 /// <param name="key">该缓存项的唯一标识符。</param>
 /// <param name="value">要插入的对象。</param>
 /// <param name="minutesValue">分钟数，精确到最接近的毫秒。一个时段，必须在此时段内访问某个缓存项，否则将从内存中逐出该缓存项。</param>
 /// <param name="removedCallback">在从缓存中移除某个缓存项后将调用该方法。</param>
 public static void Set(string key, object value, double minutesValue, CacheEntryRemovedCallback RemovedCallback)
 {
     CacheItem item = new CacheItem(key, value);
     CacheItemPolicy policy = new CacheItemPolicy();
     policy.SlidingExpiration = TimeSpan.FromMinutes(minutesValue);
     policy.RemovedCallback = RemovedCallback;
     cache.Set(item, policy);
 }

        public LoginResultForm Login(string username, string password)
        {
            LoginResultForm result = new LoginResultForm();
            ISqlMapper mapper = MapperHelper.GetMapper();
            UserDao userdao = new UserDao(mapper);
            UserInfoDao userInfoDao = new UserInfoDao(mapper);
            RoleDao roleDao = new RoleDao(mapper);
            User_RoleDao urdao = new User_RoleDao(mapper);
            LogonHistoryDao historyDao = new LogonHistoryDao(mapper);
            MenuDao menudao = new MenuDao(mapper);
            Menu_RoleDao mrdao = new Menu_RoleDao(mapper);
            var user = userdao.Query(new UserQueryForm { Name = username, Password = password }).FirstOrDefault();
            if (user != null)
            {
                if (user.Enabled == 0) throw new Exception("该用户已被禁用，请联系管理员！");
                string token = Guid.NewGuid().ToString().Replace("-", "");
                var userinfo = userInfoDao.Query(new UserInfoQueryForm { ID = user.ID }).FirstOrDefault();
                var ur = urdao.Query(new User_RoleQueryForm { UserID = user.ID });
                List<string> roleidlist = new List<string>();
                ur.ForEach(t =>
                {
                    roleidlist.Add(t.RoleID);
                });
                var roles = roleDao.Query(new RoleQueryForm { IDs = roleidlist });

                var mrs = mrdao.Query(new Menu_RoleQueryForm { RoleIDs = roleidlist });
                var menuids = (from mr in mrs select mr.MenuID).Distinct().ToList();

                result.Menu = menudao.Query(new MenuQueryForm { IDs = menuids, Enabled = 1 });

                UserEntireInfo u = new UserEntireInfo
                {
                    User = user,
                    UserInfo = userinfo,
                    Role = roles,
                };

                CacheItem item = new CacheItem(token, u);
                LogonHistory history = new LogonHistory
                {
                    LogonTime = DateTime.Now,
                    Token = token,
                    UserID = user.ID,
                    ActiveTime = DateTime.Now,
                };
                historyDao.Add(history);
                result.User = u;
                result.token = token;
                cache.AddItem(item, 1800);
                //MonitorCache.GetInstance().PushMessage(new CacheMessage { Message = "login user:" + username + ",token:" + token }, SOAFramework.Library.CacheEnum.FormMonitor);
                return result;
            }
            else
            {
                throw new Exception("用户名或者密码错误！请输入正确的用户名和密码！");
            }
        }

        /// <summary>
        /// return old entry if it is there.
        /// </summary>
        /// <param name="value"></param>
        /// <param name="policy"></param>
        /// <returns></returns>
        public override CacheItem AddOrGetExisting(CacheItem value, CacheItemPolicy policy)
        {
            var old = Get(value.Key, value.RegionName);

            Set(value, policy);
            return old == null
                ? null
                : new CacheItem(value.Key, old, value.RegionName);
        }

        /// <summary>
        /// Inserts a cache entry into the cache without overwriting any existing cache entry.
        /// </summary>
        /// <param name="cacheKey">A unique identifier for the cache entry.</param>
        /// <param name="value">The object to insert.</param>
        /// <param name="cachePolicy">An object that contains eviction details for the cache entry.</param>
        /// <returns>
        ///   <c>true</c> if insertion succeeded, or <c>false</c> if there is an already an entry in the cache that has the same key as key.
        /// </returns>
        public bool Add(CacheKey cacheKey, object value, CachePolicy cachePolicy)
        {
            string key = GetKey(cacheKey);
            var item = new CacheItem(key, value);
            var policy = CreatePolicy(cacheKey, cachePolicy);

            var existing = MemoryCache.Default.AddOrGetExisting(item, policy);
            return existing.Value == null;
        }

		protected override object OnAddOrGetExisting(string prefixedKey, object value, DateTimeOffset absoluteExpiration)
		{

			var c = new CacheItem(prefixedKey, value);
			var p = new CacheItemPolicy { AbsoluteExpiration = absoluteExpiration, Priority = System.Runtime.Caching.CacheItemPriority.Default };
			var o = _core.AddOrGetExisting(c, p);
			return o.Value;

		}

        private static void _SetupMemoryCacheForTest()
        {
            var memoryCache = MemoryCache.Default;

            var fileContents = File.ReadAllText(_contentFilePath);
            var cacheItem = new CacheItem(_contentFilePath, fileContents);
            var cacheItemPolicy = _GetCacheItemPolicy(_contentFilePath);
            memoryCache.Set(cacheItem, cacheItemPolicy);
        }

        public void Set(string key, object value, TimeSpan duration)
        {
            var item = new CacheItem(key, value);
            var policy = new CacheItemPolicy()
            {
                AbsoluteExpiration = new DateTimeOffset(DateTime.Now.Add(duration))
            };

            _cache.Set(item, policy);
        }