c# Session寫入讀取操作

        /// <summary>
        /// 寫Session
        /// </summary>
        /// <typeparam name="T">Session鍵值的類型</typeparam>
        /// <param name="key">Session的鍵名</param>
        /// <param name="value">Session的鍵值</param>
        public static void WriteSession<T>(string key, T value)
        {
            if (key.Length == 0)
                return;
            HttpContext.Current.Session[key] = value;
        }

        /// <summary>
        /// 寫Session
        /// </summary>
        /// <param name="key">Session的鍵名</param>
        /// <param name="value">Session的鍵值</param>
        public static void WriteSession(string key, string value)
        {
            WriteSession<string>(key, value);
        }

        /// <summary>
        /// 讀取Session的值
        /// </summary>
        /// <param name="key">Session的鍵名</param>        
        public static string GetSession(string key)
        {
            if (key.Length == 0)
                return string.Empty;
            return HttpContext.Current.Session[key] as string;
        }

        /// <summary>
        /// 讀取Session的值
        /// </summary>
        /// <param name="key">Session的鍵名</param>        
        public static T GetSession<T>(string key)
        {
            if (key.Length == 0)
                return default(T);
            return (T)HttpContext.Current.Session[key];
        }

        /// <summary>
        /// 刪除指定Session
        /// </summary>
        /// <param name="key">Session的鍵名</param>
        public static void RemoveSession(string key)
        {
            if (key.Length == 0)
                return;
            HttpContext.Current.Session.Contents.Remove(key);
        }

Session一般用戶登錄存取用戶信息 不過要防止偽造一般 會在用戶登錄時加入 redis  每次進頁面去驗證redis 當前用戶登錄儲存的key 是否過期 過期就重寫登錄 或者沒有KEY 
就是 仿照Session 登錄