自定义session Provider随笔[由多个请求阻塞排队处理发现]

引用：Session，有没有必要使用它？

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using IDH.Common.BaseInfoCacheManagement; using Newtonsoft.Json; using System; using System.Collections.Generic; using System.Collections.Specialized; using System.Web; using System.Web.SessionState;   namespace IdhWebApplication.Extensions.SessionProvider {     /// <summary>     /// 使用Redis实现SessionStateStoreProviderBase     /// </summary>     public class RedisSessionStateStore : SessionStateStoreProviderBase     {         /// <summary>         /// 创建新的Session执行         /// </summary>         public override SessionStateStoreData CreateNewStoreData(HttpContext context, int timeout)         {             return CreateLegitStoreData(context, null, null, timeout);         }           internal static SessionStateStoreData CreateLegitStoreData(HttpContext context, ISessionStateItemCollection sessionItems, HttpStaticObjectsCollection staticObjects, int timeout)         {             if (sessionItems == null)                 sessionItems = new SessionStateItemCollection();             if (staticObjects == null && context != null)                 staticObjects = SessionStateUtility.GetSessionStaticObjects(context);             return new SessionStateStoreData(sessionItems, staticObjects, timeout);         }           public override void CreateUninitializedItem(HttpContext context, string id, int timeout)         {             RedisSessionState state = new RedisSessionState(null, null, timeout);             BaseInfoCache.redisSessionCache.SetItem(id, state.ToJson(), timeout);         }           /// <summary>         /// 从redis获取session数据         /// </summary>         /// <param name="context"></param>         /// <param name="id"></param>         /// <param name="exclusive"></param>         /// <param name="locked"></param>         /// <param name="lockAge"></param>         /// <param name="lockId"></param>         /// <param name="actionFlags"></param>         /// <returns></returns>         private SessionStateStoreData DoGet(HttpContext context, string id, bool exclusive, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actionFlags)         {             locked = false;             lockId = null;             lockAge = TimeSpan.Zero;             actionFlags = SessionStateActions.None;             RedisSessionState state = RedisSessionState.FromJson(BaseInfoCache.redisSessionCache.GetItem(id));             if (state == null)             {                 return null;             }             BaseInfoCache.redisSessionCache.SetItem(id, state.ToJson(), state._timeout);             return CreateLegitStoreData(context, state._sessionItems, state._staticObjects, state._timeout);         }           /// <summary>         /// 取值的时候执行         /// </summary>         public override SessionStateStoreData GetItem(HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actionFlags)         {             return this.DoGet(context, id, false, out locked, out lockAge, out lockId, out actionFlags);         }           public override SessionStateStoreData GetItemExclusive(HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actionFlags)         {             return this.DoGet(context, id, true, out locked, out lockAge, out lockId, out actionFlags);         }           /// <summary>         /// 新增 修改 移除键值时执行         /// </summary>         /// <param name="item">item.Items为当前所有的键值对</param>         public override void SetAndReleaseItemExclusive(HttpContext context, string id, SessionStateStoreData item, object lockId, bool newItem)         {             ISessionStateItemCollection sessionItems = null;             HttpStaticObjectsCollection staticObjects = null;               if (item.Items.Count > 0)                 sessionItems = item.Items;             if (!item.StaticObjects.NeverAccessed)                 staticObjects = item.StaticObjects;               RedisSessionState state2 = new RedisSessionState(sessionItems, staticObjects, item.Timeout);               BaseInfoCache.redisSessionCache.SetItem(id, state2.ToJson(), item.Timeout);         }           #region "未实现方法"           public override void Dispose()         {           }           public override void EndRequest(HttpContext context)         {           }           public override void InitializeRequest(HttpContext context)         {           }           public override void ReleaseItemExclusive(HttpContext context, string id, object lockId)         {         }           public override void RemoveItem(HttpContext context, string id, object lockId, SessionStateStoreData item)         {             BaseInfoCache.redisSessionCache.RemoveItem(id);         }           public override void ResetItemTimeout(HttpContext context, string id)         {           }           public override bool SetItemExpireCallback(SessionStateItemExpireCallback expireCallback)         {             return true;         }           #endregion       }       /// <summary>     /// 存储在redis的对象     /// </summary>     public class SessionStateItem     {         /// <summary>         /// session数据         /// </summary>         public Dictionary<string,object> Dict { get; set; }           /// <summary>         /// 超时时间（分钟）         /// </summary>         public int Timeout { get; set; }     }       /// <summary>     /// 将session对象数据格式处理     /// </summary>     internal sealed class RedisSessionState     {         internal ISessionStateItemCollection _sessionItems;         internal HttpStaticObjectsCollection _staticObjects;         internal int _timeout;           internal RedisSessionState(ISessionStateItemCollection sessionItems, HttpStaticObjectsCollection staticObjects, int timeout)         {             this.Copy(sessionItems, staticObjects, timeout);         }           internal void Copy(ISessionStateItemCollection sessionItems, HttpStaticObjectsCollection staticObjects, int timeout)         {             this._sessionItems = sessionItems;             this._staticObjects = staticObjects;             this._timeout = timeout;         }           /// <summary>         /// 序列化         /// </summary>         /// <returns></returns>         public string ToJson()         {             if (_sessionItems == null || _sessionItems.Count == 0)             {                 return null;             }              var dict = new Dictionary<string, object>();               string key;             NameObjectCollectionBase.KeysCollection keys = _sessionItems.Keys;             for (int i = 0; i < keys.Count; i++)             {                 key = keys[i];                 dict.Add(key, _sessionItems[key]);             }               var item = new SessionStateItem { Dict = dict, Timeout = this._timeout };               return JsonConvert.SerializeObject(item);         }           /// <summary>         /// 反序列化         /// </summary>         /// <param name="json"></param>         /// <returns></returns>         public static RedisSessionState FromJson(string json)         {             if (string.IsNullOrEmpty(json))             {                 return null;             }             try             {                 SessionStateItem item = JsonConvert.DeserializeObject<SessionStateItem>(json);                   SessionStateItemCollection collections = new SessionStateItemCollection();                   foreach (var kvp in item.Dict)                 {                     //转换指定类型，要不然从session获取的对象无法强转为指定类型                     if(kvp.Key == "CurrentUserPermissions")                     {                         var permissionJson = JsonConvert.SerializeObject(kvp.Value);                         collections[kvp.Key] = JsonConvert.DeserializeObject<Dictionary<Guid,int>>(permissionJson);                     }                     else if(kvp.Key == "CurrentUser")                     {                         var userJson = JsonConvert.SerializeObject(kvp.Value);                         collections[kvp.Key] = JsonConvert.DeserializeObject<UserIdentity>(userJson);                     }                     else                     {                         collections[kvp.Key] = kvp.Value;                     }                 }                   return new RedisSessionState(collections, null, item.Timeout);             }             catch             {                 return null;             }         }     }   }

　　

再配置文件system.web节点下添加代码

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<sessionState mode="Custom" customProvider="RedisSessionStateStore">           <providers>               <add name="RedisSessionStateStore" type="IdhWebApplication.Extensions.SessionProvider.RedisSessionStateStore"/>           </providers>       </sessionState>