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Just curious as to why Dictionary is not supported by XmlSerializer?
You can get around it easily enough by using DataContractSerializer and writing the object to a XmlTextWriter, but what are the characteristics of a Dictionary that makes it difficult for a XmlSerializer to deal with considering it’s really an array of KeyValuePairs.
In fact, you can pass an IDictionary<TKey, TItem> to a method expecting an IEnumerable<KeyValuePairs<TKey, ITem>>.
Hashtables need hashcode and equality comparer providers generally. These cant be serialized easily in XML, and definitely will not be portable.
But I think you already found your answer. Just serialize the hashtable as a
List<KeyValuePair<K,V>>and then (re)construct it into a hashtable.