Asp.net :: Fluorine TransientAttribute And Linq-to-SQL?

I've found a workaround, but I had trouble earlier this week working with FluorineFx, where I had a Linq-to-SQL-generated object I wanted to send over the wire to Flash. This object contained a property that Flash didn't need:

[Association(Name="User_UserEntry", Storage="_UserEntries",
ThisKey="UserID", OtherKey="UserID")]
public EntitySet<UserEntry> UserEntries { ... }

But Flex couldn't handle reinflating this type, throwing: ArgumentError: Error #2173: Unable to read object in stream. The class flex.messaging.io.ArrayCollection does not implement flash.utils.IExternalizable but is aliased to an externalizable class. Now I didn't need to send the property over the wire, so I tried the steps that Marc Gravell suggested in issue 456624, firstly adding attributes to it using the MetadataTypeAttribute in System.ComponentModel.DataAnnotations (found from JasonW's comment on issue 393687:

[MetadataType(typeof(UserMetadata)]
public partial class User { }
internal class UserMetadata[code]....

Unfortunately it seems that FluorineFx doesn't support metadata attributes yet (which isn't very surprising, tbh, they are quite new). What I ended up having to do was create a dedicated DTO, with all the properties that Flash cared about and none of the properties it didn't. Not the most elegant of solutions.