protobuf-net [de]serializing across assembly boundaries

I have a base class in one assembly and a large number of generated classes in another that inherit from the base class. Using protobuf-net (r282) to serialize a list of the base type fails when attempting to resolve the subclassType (line 248 of SerializerT.cs) because the subclass i开发者_开发知识库s not in the assembly of the base class. Moving the classes together is not a preferred option and it is rather important that I can pass around List.

Here is my tagged base class. The included types are marked with ProtoMember(x) as required.

[ProtoContract] 
[ProtoInclude(1,"SomeItemType")]
[ProtoInclude(2,"AnotherItemType")]
[ProtoInclude(190,"YetAnotherItemType")]
public abstract class BaseItem
{
}

As a side note, this is part of evaluating using protobuf-net to replace BinaryFormatter for moving data between a desktop app and a SOAP webservice.

Can I do this sort of thing at all? Is there a better way? Am I just missing something obvious? A separate longer term question is should I be doing anything slightly different to prepare for an eventual move to 3.5?

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Perhaps the easiest way to use ProtoInclude is with typeof, since this will handle a lot of the nuances for you automatically:

[ProtoInclude(1, typeof(SomeItemType))]

Alternatively you can just use assembly-qualified names, so:

[ProtoInclude(1,"SomeItemType, SomeRandomAssembly")]

In a rather peculiar case involving multiple AppDomains, I've found you can also work some magic with the AppDomain.TypeResolve event, but that should be avoided if possible. I also have a complete re-working of the metadata layer in the pipeline, allowing much more flexibility at runtime (rather than having to declare everthing at compile, which is causing some of the pain above).