负载均衡时，在State_Server模式中的Session共享问题（不讨论负载均衡的问题）

前言：

配置Session的mode为State_Server模式，不说明，请按照如下配置

<sessionState mode="StateServer" stateConnectionString="tcpip=192.168.224.1:42424"cookieless="true" cookieName="APSNET_SessionId" timeout="6000" ></sessionState>

红色部分是关键部分，上面的ip是我的虚拟机的ip地址。

通过services.msc找到ASP.Net状态服务，并且开启，然后到注册表中打开AllowRemoteConnection值，设置成1.注册表地址：自己去网上搜吧，太长了不写了。

以上内容是网上大部分的内容，然后你都做好了，也未必就能Session共享。不信你去试试。（不要给我拿两个浏览器去查询，然后问我为啥不共享，我要咬人的）

补充：关于负载均衡的配置我是使用nginx做的测试，刚刚使用这个工具，还不是很熟练，你可以在网上找到。至于webFrame嘛，装起来真TMD麻烦。

正文

废话说了一大堆，上正文吧。

以上的配置都做好了之后需要检查你的iis配置，网站的应用程序池和网站的id是否相同，一定要保证相同。

那么还有一个很重要的就是要修改你的global.asax文件，添加如下代码

    public override void Init()    {        base.Init();        foreach (string moduleName in this.Modules)        {            string appName = "APPNAME";            IHttpModule module = this.Modules[moduleName];            SessionStateModule ssm = module as SessionStateModule;            if (ssm != null)            {                System.Reflection.FieldInfo storeInfo = typeof(SessionStateModule).GetField("_store", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);                SessionStateStoreProviderBase store = (SessionStateStoreProviderBase)storeInfo.GetValue(ssm);                if (store == null)//In IIS7 Integrated mode, module.Init() is called later                {                    System.Reflection.FieldInfo runtimeInfo = typeof(HttpRuntime).GetField("_theRuntime", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);                    HttpRuntime theRuntime = (HttpRuntime)runtimeInfo.GetValue(null);                    System.Reflection.FieldInfo appNameInfo = typeof(HttpRuntime).GetField("_appDomainAppId", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);                    appNameInfo.SetValue(theRuntime, appName);                }                else                {                    Type storeType = store.GetType();                    if (storeType.Name.Equals("OutOfProcSessionStateStore"))                    {                        System.Reflection.FieldInfo uribaseInfo = storeType.GetField("s_uribase", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);                        uribaseInfo.SetValue(storeType, appName);                    }                }            }        }    }

一切就绪，然后就嗨起来吧，真的可以了。我再这里不上截图了，附件将源码带上（其中包括网站项目、mvc项目和网站应用，都需要配置global文件）。

如果一切到这里就结束了，好像也能接受，但是我告诉你，我们还没完呢

通过上面的代码我们可以看到主要思路就是 HttpRuntime的_appDomainAppId属性赋值或者是给OutOfProcSessionStateStore的s_uribase赋值。

我们通过查看.net源码发现这两个属性都是私有属性,在我的源码附件中的mvc项目中可以看到，在不同的机器和iis版本下，输出的内容不一致，这个内容就是存储session库的一个关键值。

以下是我查看到的部分源码，抛出来给大家打打牙祭。

void OneTimeInit() {            SessionStateSection config = RuntimeConfig.GetAppConfig().SessionState;             s_configPartitionResolverType = config.PartitionResolverType;            s_configStateConnectionString = config.StateConnectionString;            s_configStateConnectionStringFileName = config.ElementInformation.Properties["stateConnectionString"].Source;            s_configStateConnectionStringLineNumber = config.ElementInformation.Properties["stateConnectionString"].LineNumber;            s_configCompressionEnabled = config.CompressionEnabled;             if (_partitionResolver == null) {                String stateConnectionString = config.StateConnectionString;                 SessionStateModule.ReadConnectionString(config, ref stateConnectionString, "stateConnectionString");                 s_singlePartitionInfo = (StateServerPartitionInfo)CreatePartitionInfo(stateConnectionString);            }            else {                s_usePartition = true;                s_partitionManager = new PartitionManager(new CreatePartitionInfo(CreatePartitionInfo));            }             s_networkTimeout = (int)config.StateNetworkTimeout.TotalSeconds;             string appId = HttpRuntime.AppDomainAppId;            string idHash = Convert.ToBase64String(CryptoUtil.ComputeSHA256Hash(Encoding.UTF8.GetBytes(appId)));             // Make sure that we have a absolute URI, some hosts(Cassini) don't provide this.            if (appId.StartsWith("/", StringComparison.Ordinal)) {                s_uribase = appId + "(" + idHash + ")/";            }            else {                s_uribase = "/" + appId + "(" + idHash + ")/";            }             // We only need to do this in one instance            s_onAppDomainUnload = new EventHandler(OnAppDomainUnload);            Thread.GetDomain().DomainUnload += s_onAppDomainUnload;             s_oneTimeInited = true;        }

 通过上面红色的代码，我们可以看到，不管是在global中赋值给哪个变量，最后都汇集到s_uribase这个变量中。那我们继续找，看一下是在哪里使用到了这个变量吧

void MakeRequest(                UnsafeNativeMethods.StateProtocolVerb   verb,                String                                  id,                UnsafeNativeMethods.StateProtocolExclusive    exclusiveAccess,                int                                     extraFlags,                int                                     timeout,                int                                     lockCookie,                byte[]                                  buf,                int                                     cb,                int                                     networkTimeout,                out UnsafeNativeMethods.SessionNDMakeRequestResults results) {//笔者注：这是一个很重要的out参数             int                         hr;            string                      uri;            OutOfProcConnection         conn = null;            HandleRef                   socketHandle;            bool                        checkVersion = false;             Debug.Assert(timeout <= SessionStateModule.MAX_CACHE_BASED_TIMEOUT_MINUTES, "item.Timeout <= SessionStateModule.MAX_CACHE_BASED_TIMEOUT_MINUTES");             SessionIDManager.CheckIdLength(id, true /* throwOnFail */);             if (_partitionInfo == null) {                Debug.Assert(s_partitionManager != null);                Debug.Assert(_partitionResolver != null);                 _partitionInfo = (StateServerPartitionInfo)s_partitionManager.GetPartition(_partitionResolver, id);                 // If its still null, we give up                if (_partitionInfo == null) {                    throw new HttpException(SR.GetString(SR.Bad_partition_resolver_connection_string, "PartitionManager"));                }            }             // Need to make sure we dispose the connection if anything goes wrong            try {                conn = (OutOfProcConnection)_partitionInfo.RetrieveResource();                if (conn != null) {                    socketHandle = new HandleRef(this, conn._socketHandle.Handle);                }                else {                    socketHandle = new HandleRef(this, INVALID_SOCKET);                }                 if (_partitionInfo.StateServerVersion == -1) {                    // We don't need locking here because it's okay to have two                    // requests initializing s_stateServerVersion.                    checkVersion = true;                }                 Debug.Trace("OutOfProcSessionStateStoreMakeRequest",                            "Calling MakeRequest, " +                            "socket=" + (IntPtr)socketHandle.Handle +                            "verb=" + verb +                            " id=" + id +                            " exclusiveAccess=" + exclusiveAccess +                            " timeout=" + timeout +                            " buf=" + ((buf != null) ? "non-null" : "null") +                            " cb=" + cb +                            " checkVersion=" + checkVersion +                            " extraFlags=" + extraFlags);                 // Have to UrlEncode id because it may contain non-URL-safe characters                uri = HttpUtility.UrlEncode(s_uribase + id);//笔者注：在这里使用到了s_uribase //笔者注：在这里使用uri和主方法的out参数作为参数调用了另外一个方法，并且返回了一个int类型，到此可以看到 hr 对我们的价值已经没有了，我们进入到这个方法看看吧。                hr = UnsafeNativeMethods.SessionNDMakeRequest(                        socketHandle, _partitionInfo.Server, _partitionInfo.Port, _partitionInfo.ServerIsIPv6NumericAddress /* forceIPv6 */, networkTimeout, verb, uri,                        exclusiveAccess, extraFlags, timeout, lockCookie,                        buf, cb, checkVersion, out results);                 Debug.Trace("OutOfProcSessionStateStoreMakeRequest", "MakeRequest returned: " +                            "hr=" + hr +                            " socket=" + (IntPtr)results.socket +                            " httpstatus=" + results.httpStatus +                            " timeout=" + results.timeout +                            " contentlength=" + results.contentLength +                            " uri=" + (IntPtr)results.content +                            " lockCookie=" + results.lockCookie +                            " lockDate=" + string.Format("{0:x}", results.lockDate) +                            " lockAge=" + results.lockAge +                            " stateServerMajVer=" + results.stateServerMajVer +                            " actionFlags=" + results.actionFlags);                 if (conn != null) {                    if (results.socket == INVALID_SOCKET) {                        conn.Detach();                        conn = null;                    }                    else if (results.socket != socketHandle.Handle) {                        // The original socket is no good.  We've got a new one.                        // Pleae note that EnsureConnected has closed the bad                        // one already.                        conn._socketHandle = new HandleRef(this, results.socket);                    }                }                else if (results.socket != INVALID_SOCKET) {                    conn = new OutOfProcConnection(results.socket);                }                 if (conn != null) {                    _partitionInfo.StoreResource(conn);                }            }            catch {                // We just need to dispose the connection if anything bad happened                if (conn != null) {                    conn.Dispose();                }                 throw;            }             if (hr != 0) {                HttpException e = CreateConnectionException(_partitionInfo.Server, _partitionInfo.Port, hr);                 string phase = null;                 switch (results.lastPhase) {                case (int)UnsafeNativeMethods.SessionNDMakeRequestPhase.Initialization:                    phase = SR.GetString(SR.State_Server_detailed_error_phase0);                    break;                 case (int)UnsafeNativeMethods.SessionNDMakeRequestPhase.Connecting:                    phase = SR.GetString(SR.State_Server_detailed_error_phase1);                    break;                 case (int)UnsafeNativeMethods.SessionNDMakeRequestPhase.SendingRequest:                    phase = SR.GetString(SR.State_Server_detailed_error_phase2);                    break;                 case (int)UnsafeNativeMethods.SessionNDMakeRequestPhase.ReadingResponse:                    phase = SR.GetString(SR.State_Server_detailed_error_phase3);                    break;                 default:                    Debug.Assert(false, "Unknown results.lastPhase: " + results.lastPhase);                    break;                }                 WebBaseEvent.RaiseSystemEvent(SR.GetString(SR.State_Server_detailed_error,                            phase,                            "0x" + hr.ToString("X08", CultureInfo.InvariantCulture),                            cb.ToString(CultureInfo.InvariantCulture)),                            this, WebEventCodes.WebErrorOtherError, WebEventCodes.StateServerConnectionError, e);                 throw e;            }             if (results.httpStatus == 400) {                if (s_usePartition) {                    throw new HttpException(                        SR.GetString(SR.Bad_state_server_request_partition_resolver,                                    s_configPartitionResolverType, _partitionInfo.Server, _partitionInfo.Port.ToString(CultureInfo.InvariantCulture)));                }                else {                    throw new HttpException(                        SR.GetString(SR.Bad_state_server_request));                }            }             if (checkVersion) {                _partitionInfo.StateServerVersion = results.stateServerMajVer;                if (_partitionInfo.StateServerVersion < WHIDBEY_MAJOR_VERSION) {                    // We won't work with versions lower than Whidbey                    if (s_usePartition) {                        throw new HttpException(                            SR.GetString(SR.Need_v2_State_Server_partition_resolver,                                        s_configPartitionResolverType, _partitionInfo.Server, _partitionInfo.Port.ToString(CultureInfo.InvariantCulture)));                    }                    else {                        throw new HttpException(                            SR.GetString(SR.Need_v2_State_Server));                    }                }            }        }

     下面是SessionNDMakeRequest方法的源代码，很明显在上面使用了这个方法，

    [DllImport(ModName.ENGINE_FULL_NAME, CharSet=CharSet.Ansi, BestFitMapping=false, ThrowOnUnmappableChar=true)]        internal static extern int SessionNDMakeRequest(                HandleRef               socket,                string                  server,                int                     port,                bool                    forceIPv6,                int                     networkTimeout,                StateProtocolVerb       verb,                string                  uri,                StateProtocolExclusive  exclusive,                int                     extraFlags,                int                     timeout,                int                     lockCookie,                byte[]                  body,                int                     cb,                bool                    checkVersion,                out SessionNDMakeRequestResults results);

真的要到此为止，往下也找不到了，也看不懂了，等到高手来指导，说的就是你，不要走，告诉我这是为什么  ^_^!!!

源码在这里点击下崽哟