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    <p>You need to implement NHibernate's IUserType.</p> <p>It should like this:</p> <pre><code>using NHibernate.SqlTypes; using NHibernate.UserTypes; [Serializable] //to allow NH configuration serialization public class GuidTypeConverter : IUserType { SqlType[] sqlTypes; public GuidTypeConverter() { sqlTypes = new[] { SqlTypeFactory.GetSqlType(DbType.Guid, 0, 0) }; } public SqlType[] SqlTypes { get { return sqlTypes; } } public Type ReturnedType { get { return typeof(Guid); } } public object NullSafeGet(IDataReader rs, string[] names, object owner) { if (rs[names[0]] == DBNull.Value) { return Guid.Empty; } return (Guid) rs[names[0]]; } public void NullSafeSet(IDbCommand cmd, object value, int index) { var param = (IDataParameter) cmd.Parameters[index]; param.DbType = sqlTypes[0].DbType; var guid = (Guid) value; if (guid != Guid.Empty) { param.Value = guid; } else { param.Value = DBNull.Value; } } public bool IsMutable { //guid is struct so it's not mutable get { return false; } } public object DeepCopy(object value) { return value; } public object Replace(object original, object target, object owner) { return original; } public object Assemble(object cached, object owner) { return cached; } public object Disassemble(object value) { return value; } public new bool Equals(object x, object y) { return x != null &amp;&amp; x.Equals(y); } public int GetHashCode(object x) { return x.GetHashCode(); } } </code></pre> <p>(Note that I haven't tested it, there are casts here - some tweaking is probably needed)</p> <p>In mapping you specify:</p> <pre><code>&lt;property name="GuidProperty" column="guidColumn" type="GuidTypeConverterNamespace.GuidTypeConverter, GuidTypeConverterAssemblyName" /&gt; </code></pre>
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    1. POMaking NHibernate "translate" C# POCO Guid property with value of System.Guid.Empty to be saved as NULL for the Database uniqueidentifier field?
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    1. POMaking NHibernate "translate" C# POCO Guid property with value of System.Guid.Empty to be saved as NULL for the Database uniqueidentifier field?
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    1. COThis seems like a lot of code to do something so simple. I think I'm going off NHibernate.
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    2. COWell, maybe it is, but I just wrap the boilerplate code into base class in my projects (ImmutableTypeConverter). I don't find it a reason to go off NHibernate just because of this -- "featurerichness" has some costs.
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    3. CO@pkmiec Thanks for the code. I took your advice, but tomfanning seems to bring up a good point. It is quite a lot of work for something simple.
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