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XmlSerializer behaves differently in the Mono for Android version than normal 4.0 mono, .net, or .net for windows phone.
If you serialize a derived class that has a default constructor but the base class does not have a default constructor, the runtime throws an InvalidOperation exception with no details.
In other versions of .NET this serializes fine. Since a default constructor is the norm when serializing, the bug may be in all other versions of the framework.
// Exception throw here
XmlSerializer ser = new XmlSerializer(derived.GetType());
I've got the same problem.
In my case my base class is Generic and Abstract while my Derived class does not have default constructor, it crashes on this line.
var ser = new XmlSerializer(typeof(T));
That probably confirm the problem and narrow it to the derived default constructor missing.
Thank you for the bug report.
The problem was fixed in master by the following commit.