using System.Xml.Serialization;
using System.Collections.Generic;
using System.Xml;
using System.IO;
using System;

public class DictionarySerializer<K, V>
{
    public struct SerializableKeyValuePair<TKey, TValue>
    {
        public TKey Key;
        public TValue Value;
        public SerializableKeyValuePair(KeyValuePair<TKey, TValue> kvp)
        {
            this.Key = kvp.Key;
            this.Value = kvp.Value;
        }
    }

    private XmlSerializer Serializer = new XmlSerializer(typeof(List<SerializableKeyValuePair<K, V>>));

    public void Serialize(Dictionary<K, V> dictionary, XmlWriter serializationStream)
    {
        Serializer.Serialize(serializationStream, BuildItemList(dictionary));
    }
    public void Serialize(Dictionary<K, V> dictionary, TextWriter serializationStream)
    {
        Serializer.Serialize(serializationStream, BuildItemList(dictionary));
    }
    public void Serialize(Dictionary<K, V> dictionary, Stream serializationStream)
    {
        Serializer.Serialize(serializationStream, BuildItemList(dictionary));
    }

    private List<SerializableKeyValuePair<K, V>> BuildItemList(Dictionary<K, V> dictionary)
    {
        List<SerializableKeyValuePair<K, V>> list = new List<SerializableKeyValuePair<K, V>>();
        foreach (KeyValuePair<K, V> nonSerializableKVP in dictionary)
        {
            list.Add(new SerializableKeyValuePair<K, V>(nonSerializableKVP));
        }

        return list;

    }


    public Dictionary<K, V> Deserialize(XmlReader serializationStream)
    {
        List<SerializableKeyValuePair<K, V>> dictionaryItems = Serializer.Deserialize(serializationStream) as List<SerializableKeyValuePair<K, V>>;
        return BuildDictionary(dictionaryItems);
    }
    public Dictionary<K, V> Deserialize(TextReader serializationStream)
    {
        List<SerializableKeyValuePair<K, V>> dictionaryItems = Serializer.Deserialize(serializationStream) as List<SerializableKeyValuePair<K, V>>;
        return BuildDictionary(dictionaryItems);
    }
    public Dictionary<K, V> Deserialize(Stream serializationStream)
    {
        List<SerializableKeyValuePair<K, V>> dictionaryItems = Serializer.Deserialize(serializationStream) as List<SerializableKeyValuePair<K, V>>;
        return BuildDictionary(dictionaryItems);
    }

    private Dictionary<K, V> BuildDictionary(List<SerializableKeyValuePair<K, V>> dictionaryItems)
    {
        Dictionary<K, V> dictionary = new Dictionary<K, V>(dictionaryItems.Count);
        foreach (SerializableKeyValuePair<K, V> item in dictionaryItems)
        {
            dictionary.Add(item.Key, item.Value);
        }

        return dictionary;
    }

}