Post #7 ? Serializing Dictionary to/from XML
; http://blogs.msdn.com/mglehman/archive/2009/11/09/post-7-serializing-dictionary-string-string-to-from-xml.aspx

static void Main(string[] args)
{
    Dictionary<string, string> dict = new Dictionary<string, string>();

    dict.Add("test", "test1");

    MemoryStream ms = new MemoryStream();
    XmlWriter writer = XmlWriter.Create(ms);

    // 예외 발생
    // XmlSerializer xs = new XmlSerializer(typeof(Dictionary<string, string>));
    // xs.Serialize(ms, dict);

    DataContractSerializer dcs = new DataContractSerializer(typeof(Dictionary<string, string>));
    dcs.WriteObject(writer, dict);
    writer.Close();

    ms.Position = 0;
    Dictionary<string, string> dict2 = dcs.ReadObject(ms) as Dictionary<string, string>;
}