public object Read(object value, ProtoReader source)
{
// TODO what may happen if old value is already existing reference? do we need to consider it?
var v = _subTypeHelpers.TryRead(_model[_typeKey], value?.GetType(), source);
if (v != null)
{
value = v.Serializer.CreateInstance(source);
}
else if (value != null)
{
ProtoReader.NoteObject(value, source);
}
else
{
throw new ProtoException(CantCreateInstanceMessage);
}
// each CreateInstance notes object
ProtoReader.NoteLateReference(_baseTypeKey, value, source);
return(value);
}