“Type not expected”, using DataContractSerializer - but it's just a simple class, no funny stuff?

Question

I\'m refactoring my XML-serialization, and figured I\'d try the DataContractSerializer. Everything runs smoothly, until it needs to serialize this class:

Answer 1

use KnownTypeAttribute for resolving DataFelt class. see: http://msdn.microsoft.com/en-us/library/system.runtime.serialization.knowntypeattribute.aspx