serialization of dictionary

I have lists of objects that I want to store in the session and I'm declaring them like this:

Dictionary<DateTime, List<MyObjects>> SessionMyObjects = new Dictionary<DateTime, List<MyObjects>>();

I'm reading some posts that suggest that dictionaries are not serializable and storing dictionaries in the session will cause errors. What is this about? I'm using InProc; there's no serialization with this storage type? If the code compiles, could I still get some strange errors later because o开发者_Python百科f using this structure?

Why isnt there an XMLSerializable dictionary in .NET?

Paul Welter published a good SerializableDictionary.