Question

I am getting this error from time to time with serialization and I don’t know which file I need to serialize.
The pages are on and off one time they load other time they don’t.
Here is the error I am getting:

System.Web.HttpException (0x80004005): 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. —>
System.Runtime.Serialization.SerializationException: Type
‘System.Data.Entity.DynamicProxies.Product_CC06DC79809AC788823D74B88F94CCB7155ADCE697911AF73214FB8B5F2B2EB4’
in Assembly ‘EntityFrameworkDynamicProxies-Nop.BusinessLogic,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’ is not marked
as serializable. at
System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType
type) at
System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type
type, StreamingContext context) at
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo()
at
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object
obj, ISurrogateSelector surrogateSelector, StreamingContext context,
SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter,
ObjectWriter objectWriter, SerializationBinder binder) at
System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo
objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo) at
System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object
graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
at
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream
serializationStream, Object graph, Header[] headers, Boolean fCheck)
at System.Web.Util.AltSerialization.WriteValueToStream(Object value,
BinaryWriter writer) 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.SqlSessionStateStore.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)

So basically what I think is something with the entity model but I want to know how I can serialize that.
Thanks in advance, Laziale

Answer 1

System.Data.Entity.DynamicProxies.Product (Error with this class)

Should add [DataContract] attribute on class and [DataMember] on fields like that

using System.Runtime.Serialization;
[DataContract]
public class Account
{
    [DataMember]
    public System.Guid ID { get; set; }
    [DataMember]
    public System.Guid AccountSubTypeID { get; set; }
    [DataMember]
    public Nullable<int> IndustryTypeID { get; set; }
}