当从InProc修改为为StateServer 模式时出错

[tanyuqiong]

web.config 部分配置如下
<sessionState
mode="StateServer"
stateConnectionString="tcpip=127.0.0.1:42424"

cookieless="false"
timeout="180"
/>

错误提示
“/”应用程序中的服务器错误。
--------------------------------------------------------------------------------

无法序列化会话状态。请注意，当会话状态模式为“StateServer”或“SQLServer”时，不允许使用无法序列化的对象或 MarshalByRef 对象。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.Web.HttpException: 无法序列化会话状态。请注意，当会话状态模式为“StateServer”或“SQLServer”时，不允许使用无法序列化的对象或 MarshalByRef 对象。

源错误:

执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。

堆栈跟踪:


[SerializationException: 程序集 System.Data, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 中的类型 System.Data.SqlClient.SqlConnection 未标记为可序列化。]
System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type, Boolean excludeNonSerializable) +853
System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context) +300
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo() +103
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter) +493
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter) +48
System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) +683
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) +136
System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer) +1621

[HttpException (0x80004005): 无法序列化会话状态。请注意，当会话状态模式为“StateServer”或“SQLServer”时，不允许使用无法序列化的对象或 MarshalByRef 对象。]
System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer) +1711
System.Web.SessionState.SessionDictionary.Serialize(BinaryWriter writer) +150
System.Web.SessionState.StateClientManager.Serialize(SessionStateItem item, Stream stream) +146
System.Web.SessionState.OutOfProcStateClientManager.System.Web.SessionState.IStateClientManager.Set(String id, SessionStateItem item, Boolean inStorage) +121
System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +465
System.Web.SyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute() +60
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +87

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