XmlSerializer constructor error with class derived from a base class?

If you change the XmlTextAttribute to XmlAttribute or XmlElement it should be ok. Since you were trying to use the XmlTextAttribute, it assumed it would be some sort of string. If you want an actual byte array serialized, try the XmlAttribute or XmlElement.

I'd look into making sure your base class is also properly decorated. I don't know if this will help or not, though.

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