Complex data types in WCF?

Question

I\'ve run into a problem trying to return an object that holds a collection of childobjects that again can hold a collection of grandchild objects. I get an error, \'connect

Answer 1

I have had the same problem too (.Net 3.5). Turns out my base class DataContract was missing a known type. It's unfortunate that the WCF error was not more descriptive.