Serialize a Dictionary

I have been able to serialize an ienumerable this way

Code:

            [XmlArray("TRANSACTIONS")]
            [XmlArrayItem("TRANSACTION", typeof(Record))]
            public IEnumerable Records
            {
                    get 
                    {
                            foreach(Record br in _budget)
                            {
                                    yield return br;
                            }
                    }
            }

However, I realised that now I need a dictionnary containing a collection (Dictionary (Record collection implements ienumerable)))?

how can i achieve that?

Thank you