iis 状态服务器,哪个对象不能序列化?状态服务器的IIS会话状态

I am running an ASP.net website under IIS with a state server. An object is failing to serialize, but I do not know which one. Is there a way for IIS or Visual Studio to tell me which object is failing to serialize?

Thank you.

********** 12/3/2015 9:22:23 PM **********

Exception giud: 3fa14c14-cad5-48fa-a23a-7eccc3340093

Inner Exception Type: System.Web.HttpException

Inner Exception: Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.

Inner Source: System.Web

Inner Stack Trace:

at System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer)

at System.Web.SessionState.SessionStateItemCollection.WriteValueToStreamWithAssert(Object value, BinaryWriter writer)

at System.Web.SessionState.SessionStateItemCollection.Serialize(BinaryWriter writer)

at System.Web.SessionState.SessionStateUtility.Serialize(SessionStateStoreData item, Stream stream)

at System.Web.SessionState.SessionStateUtility.SerializeStoreData(SessionStateStoreData item, Int32 initialStreamSize, Byte[]& buf, Int32& length, Boolean compressionEnabled)

at System.Web.SessionState.OutOfProcSessionStateStore.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem)

at System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs)

at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Exception Type: System.Web.HttpException

Exception: Server Error: 500

Source: HttpError

Stack Trace:

Talk1:

Can you try to catch the SerializationException and paste it here? Check out this answer

Solutions1

The exception thrown in your case is of type System.Web.HttpException

The InnerException is of type HttpException

Check the inner exception of the inner exception. It will contain the actual serialization exception according to the Reference Source of AltSerialization.WriteValueToStream

The source code of it's try/catch block for serializing non-value and non-well-known types is as follows. You can see the HttpException being built with the more detailed serialization exception as the inner exception. It will give you the actual type that is non-serializable:

try {

formatter.Serialize(writer.BaseStream, value);

} catch (Exception innerException) {

HttpException outerException = new HttpException(SR.GetString(SR.Cant_serialize_session_state), innerException);

outerException.SetFormatter(new UseLastUnhandledErrorFormatter(outerException));

throw outerException;

}

Talk1:

This worked, thank you. Quite clearly tells me what the object is that was not serializable.

Talk2:

I'm glad to hear that. :) Now it's time to find who put it there :)