Hi Guys,

I'm pretty new with NHib. so bare with me.
I'm trying to run a proof of concept project with Hniber. for Data layer and WCF for transport layer to business layer.

I'm dealing with a very starnge exception, when building NHibernate persistence objects (with reflection) in business layers.

<ApplicationData>System.IO.FileNotFoundException: Could not load file or assembly 'DynamicAssemblyProxyGen, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'DynamicAssemblyProxyGen, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'

Server stack trace:
at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.Load(String assemblyString)
at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.ResolveDataContractInSharedTypeMode(String assemblyName, String typeName, Assembly& assembly, Type& type)
at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserializeInSharedTypeMode(XmlReaderDelegator xmlReader, Int32 declaredTypeID, Type declaredType, String name, String ns)
at ReadEmployeeFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString[] , XmlDictionaryString[] )
at System.Runtime.Serialization.ClassDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context)
at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserializeInSharedTypeMode(XmlReaderDelegator xmlReader, Int32 declaredTypeID, Type declaredType, String name, String ns)
at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserialize(XmlReaderDelegator xmlReader, Type declaredType, String name, String ns)
at System.Runtime.Serialization.NetDataContractSerializer.InternalReadObject(XmlReaderDelegator xmlReader, Boolean verifyObjectName)
at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName)
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeBody(XmlDictionaryReader reader, MessageVersion version, String action, MessageDescription messageDescription, Object[] parameters, Boolean isRequest)
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeBodyContents(Message message, Object[] parameters, Boolean isRequest)
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeReply(Message message, Object[] parameters)
at System.ServiceModel.Dispatcher.ProxyOperationRuntime.AfterReply(ProxyRpc& rpc)
at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Here is a sample of my WCF client :
Business.Objects.Claim c = client.GetClaim(Guid.NewGuid(), null);
client.SelectNHiberEmployee(1, null, null);
Business.Objects.Employee e2 = (new ContactManagerClien()).SelectNHiberEmployee(2, null, null);
e2.LastName = DateTime.Now.ToString();
client.SaveNHiberEmployee(e2);

Mapping file:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
namespace="ECX.Business.Objects" assembly="BusinessObjects">

<class name="Employee" table="Employees">
<id name="Id" column="EmployeeId" type="long" unsaved-value="-1"
access="field.camelcase-underscore">
<generator class="native" />
</id>

<property name="LastName" column="LastName" type="string" length="20"
not-null="true" access="field.camelcase-underscore"/>

<property name="FirstName" column="FirstName" type="string" length="10"
not-null="true" access="field.camelcase-underscore"/>

<property name="Title" column="Title" type="string" length="30"
access="field.camelcase-underscore"/>

<property name="TitleOfCourtesy" column="TitleOfCourtesy" type="string" length="25"
access="field.camelcase-underscore"/>

<property name="BirthDate" column="BirthDate" type="DateTime"
access="field.camelcase-underscore"/>

<property name="HireDate" column="HireDate" type="DateTime"
access="field.camelcase-underscore"/>

<component name="Address" class="ECX.Business.Objects.Address, BusinessObjects"
access="field.camelcase-underscore" insert="true" update="true">

<property name="Street" column="Address" type="string" length="60"
access="field.camelcase-underscore"/>

<property name="City" column="City" type="string" length="15"
access="field.camelcase-underscore"/>

<property name="Region" column="Region" type="string" length="15"
access="field.camelcase-underscore"/>

<property name="PostalCode" column="PostalCode" type="string" length="10"
access="field.camelcase-underscore"/>

<property name="Country" column="Country" type="string" length="15"
access="field.camelcase-underscore"/>

<property name="PhoneNumber" column="HomePhone" type="string" length="24"
access="field.camelcase-underscore"/>

</component>

<property name="Extension" column="Extension" type="string" length="4"
access="field.camelcase-underscore"/>

<property name="Notes" column="Notes" type="string"
access="field.camelcase-underscore"/>



<many-to-one name="Superior" class="Employee" column="ReportsTo"
access="field.camelcase-underscore" fetch="select"/>


<set name="Orders" access="field.camelcase-underscore"
cascade="save-update" lazy="false">
<key column="EmployeeId"/>
<one-to-many class="Order"/>
</set>



</class>

</hibernate-mapping>

Presistence object:
namespace ECX.Business.Objects
{
[DataContract]
[KnownType(typeof(Iesi.Collections.Generic.HashedSet<Employee>))]
[KnownType(typeof(Item))]
[KnownType(typeof(Address))]

public class Employee : NEntity<Employee>
{

private ICollection<Order> _orders;


private Address _address;
private DateTime? _birthDate;
private string _extension;
private string _firstName;
private DateTime? _hireDate;
private string _lastName;
private string _notes;
private Employee _superior;
private string _title;
private string _titleOfCourtesy;

public Employee()
: this(null, null)
{
}

public Employee(string firstName, string lastName)
{
_firstName = firstName;
_lastName = lastName;


}

[DataMember]
public virtual string FirstName
{
get { return _firstName; }
set { _firstName = value; }
}
[DataMember]
public virtual string LastName
{
get { return _lastName; }
set { _lastName = value; }
}
[DataMember]
public virtual string Title
{
get { return _title; }
set { _title = value; }
}
[DataMember]
public virtual string TitleOfCourtesy
{
get { return _titleOfCourtesy; }
set { _titleOfCourtesy = value; }
}
[DataMember]
public virtual DateTime? BirthDate
{
get { return _birthDate; }
set { _birthDate = value; }
}
[DataMember]
public virtual DateTime? HireDate
{
get { return _hireDate; }
set { _hireDate = value; }
}
[DataMember]
public virtual Address Address
{
get { return _address; }
set { _address = value; }
}
[DataMember]
public virtual string Extension
{
get { return _extension; }
set { _extension = value; }
}
[DataMember]
public virtual string Notes
{
get { return _notes; }
set { _notes = value; }
}
[DataMember]
public virtual Employee Superior
{
get { return _superior; }
set { _superior = value; }
}

[DataMember]
public virtual ICollection<Order> Orders
{
get { return _orders; }
set { _orders = value; }
}


My DataAbstraction layer (uses NHibernate) , use 2 sessions: one for read and one for write per client, where in write session we evict the persistence object after save!

I'm using [UseNetDataContractSerializer] attribute as suggested by best practice for NHib. and WCF

I've installed only NHibernate (without castle project), there is no constant scenario for receiving this exception.
I seems like something goes wrong in desterilizing objects in WCF ???

Thank you for reading, every comment will be welcome.

Ofer.