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    <p>I have ended up doing my own DuplicateEntityChecker and have changed ComponentRegistrar to use that instead of SharpArch one.</p> <p>My class looks like this.</p> <pre><code>using NHibernate; using SharpArch.Core.DomainModel; using System.Reflection; using System; using NHibernate.Criterion; using SharpArch.Core; using SharpArch.Core.PersistenceSupport; using System.Linq; using SharpArch.Data.NHibernate; namespace your.namespace.Data.NHibernate { public class EntityDuplicateChecker : IEntityDuplicateChecker { /// &lt;summary&gt; /// Provides a behavior specific repository for checking if a duplicate exists of an existing entity. /// &lt;/summary&gt; public bool DoesDuplicateExistWithTypedIdOf&lt;IdT&gt;(IEntityWithTypedId&lt;IdT&gt; entity) { Check.Require(entity != null, "Entity may not be null when checking for duplicates"); ISession session = GetSessionFor(entity); FlushMode previousFlushMode = session.FlushMode; // We do NOT want this to flush pending changes as checking for a duplicate should // only compare the object against data that's already in the database session.FlushMode = FlushMode.Never; Criteria = session.CreateCriteria(entity.GetType()) .Add(Expression.Not(Expression.Eq("Id", entity.Id))) .SetMaxResults(1); AppendSignaturePropertyCriteriaTo&lt;IdT&gt;(Criteria, entity); bool doesDuplicateExist = Criteria.List().Count &gt; 0; session.FlushMode = previousFlushMode; return doesDuplicateExist; } public ICriteria Criteria { get; protected set; } private void AppendSignaturePropertyCriteriaTo&lt;IdT&gt;(ICriteria criteria, IEntityWithTypedId&lt;IdT&gt; entity) { foreach (PropertyInfo signatureProperty in entity.GetSignatureProperties()) { Type propertyType = signatureProperty.PropertyType; object propertyValue = signatureProperty.GetValue(entity, null); if (propertyType.IsEnum) { criteria.Add( Expression.Eq(ResolvePropertyName(string.Empty, signatureProperty), (int)propertyValue)); } else if (propertyType.GetInterfaces() .Any(x =&gt; x.IsGenericType &amp;&amp; x.GetGenericTypeDefinition() == typeof(IEntityWithTypedId&lt;&gt;))) { AppendEntityCriteriaTo&lt;IdT&gt;(criteria, signatureProperty, propertyValue); } else if (propertyType == typeof(DateTime)) { AppendDateTimePropertyCriteriaTo(criteria, string.Empty, signatureProperty, propertyValue); } else if (propertyType == typeof(String)) { AppendStringPropertyCriteriaTo(criteria, string.Empty, signatureProperty, propertyValue); } else if (propertyType.IsValueType) { AppendValuePropertyCriteriaTo(criteria, string.Empty, signatureProperty, propertyValue); } else if(typeof(ValueObject).IsAssignableFrom(propertyType)) { AppendValueObjectSignaturePropertyCriteriaTo(criteria, signatureProperty.Name + ".", propertyValue as ValueObject); } else { throw new ApplicationException("Can't determine how to use " + entity.GetType() + "." + signatureProperty.Name + " when looking for duplicate entries. To remedy this, " + "you can create a custom validator or report an issue to the S#arp Architecture " + "project, detailing the type that you'd like to be accommodated."); } } } private void AppendValueObjectSignaturePropertyCriteriaTo(ICriteria criteria, string parentPropertyName, ValueObject valueObject) { if(valueObject == null) return; foreach (PropertyInfo signatureProperty in valueObject.GetSignatureProperties()) { Type propertyType = signatureProperty.PropertyType; object propertyValue = signatureProperty.GetValue(valueObject, null); if (propertyType.IsEnum) { criteria.Add( Expression.Eq(ResolvePropertyName(parentPropertyName, signatureProperty), (int)propertyValue)); } else if (propertyType == typeof(DateTime)) { AppendDateTimePropertyCriteriaTo(criteria, parentPropertyName, signatureProperty, propertyValue); } else if (propertyType == typeof(String)) { AppendStringPropertyCriteriaTo(criteria, parentPropertyName, signatureProperty, propertyValue); } else if (propertyType.IsValueType) { AppendValuePropertyCriteriaTo(criteria, parentPropertyName, signatureProperty, propertyValue); } else if (typeof(ValueObject).IsAssignableFrom(propertyType)) { AppendValueObjectSignaturePropertyCriteriaTo(criteria, ResolvePropertyName(parentPropertyName, signatureProperty), propertyValue as ValueObject); } else { throw new ApplicationException("Can't determine how to use " + valueObject.GetType() + "." + signatureProperty.Name + " when looking for duplicate entries. To remedy this, " + "you can create a custom validator or report an issue to the S#arp Architecture " + "project, detailing the type that you'd like to be accommodated."); } } } private void AppendStringPropertyCriteriaTo(ICriteria criteria, string parentPropertyName, PropertyInfo signatureProperty, object propertyValue) { var propertyName = ResolvePropertyName(parentPropertyName, signatureProperty); if (propertyValue != null) { criteria.Add( Expression.InsensitiveLike(propertyName, propertyValue.ToString(), MatchMode.Exact)); } else { criteria.Add(Expression.IsNull(propertyName)); } } private void AppendDateTimePropertyCriteriaTo(ICriteria criteria, string parentPropertyName, PropertyInfo signatureProperty, object propertyValue) { var propertyName = ResolvePropertyName(parentPropertyName, signatureProperty); if ((DateTime) propertyValue &gt; UNINITIALIZED_DATETIME) { criteria.Add(Expression.Eq(propertyName, propertyValue)); } else { criteria.Add(Expression.IsNull(propertyName)); } } private void AppendValuePropertyCriteriaTo(ICriteria criteria, string parentPropertyName, PropertyInfo signatureProperty, object propertyValue) { var propertyName = ResolvePropertyName(parentPropertyName, signatureProperty); if (propertyValue != null) { criteria.Add(Expression.Eq(propertyName, propertyValue)); } else { criteria.Add(Expression.IsNull(propertyName)); } } private static void AppendEntityCriteriaTo&lt;IdT&gt;(ICriteria criteria, PropertyInfo signatureProperty, object propertyValue) { if (propertyValue != null) { criteria.Add(Expression.Eq(signatureProperty.Name + ".Id", ((IEntityWithTypedId&lt;IdT&gt;)propertyValue).Id)); } else { criteria.Add(Expression.IsNull(signatureProperty.Name + ".Id")); } } private static string ResolvePropertyName(string parentPropertyName, PropertyInfo signatureProperty) { if (string.IsNullOrEmpty(parentPropertyName)) return signatureProperty.Name; if (parentPropertyName.EndsWith(".") == false) parentPropertyName += "."; return string.Format("{0}{1}", parentPropertyName, signatureProperty.Name); } private static ISession GetSessionFor(object entity) { var factoryKey = SessionFactoryAttribute.GetKeyFrom(entity); return NHibernateSession.CurrentFor(factoryKey); } private readonly DateTime UNINITIALIZED_DATETIME = default(DateTime); } } </code></pre> <p>Hope this helps anyone with the same problem.</p>
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    1. POHow to AppendSignaturePropertyCriteriaTo ValueObject
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    1. COThis could be a really nice feature. Is there a reason why you created a public ICriteria property? Do you need access to the criteria from outside the class?
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    2. COAhh, yes I used it for testing purposes but it turned out I couldn't use it. So no need for it to be public.
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    3. COI think others would appreciate this. You should fork the project on GitHub and add this code to the EntityDuplicateChecker class and send a pull request.
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