C# SerializableDictionary序列化/反序列化

说明：Dictionary对象本身不支持序列化和反序列化，需要定义一个继承自Dictionary, IXmlSerializable类的自定义类来实现该功能。感觉完全可以把这样的类封装到C#库中，很具有通用性嘛，至今没有遇到不能用的情况的说，或许出于其他方面的考虑microsoft才没有这么做。

2.SerializableDictionary自定义类

[Serializable]
public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable
{
    public SerializableDictionary() { }
    public void WriteXml(XmlWriter write)       // Serializer
    {
        XmlSerializer KeySerializer = new XmlSerializer(typeof(TKey));
        XmlSerializer ValueSerializer = new XmlSerializer(typeof(TValue));

        foreach (KeyValuePair<TKey, TValue> kv in this)
        {
            write.WriteStartElement("SerializableDictionary");
            write.WriteStartElement("key");
            KeySerializer.Serialize(write, kv.Key);
            write.WriteEndElement();
            write.WriteStartElement("value");
            ValueSerializer.Serialize(write, kv.Value);
            write.WriteEndElement();
            write.WriteEndElement();
        }
    }
    public void ReadXml(XmlReader reader)       // Deserializer
    {
        reader.Read();
        XmlSerializer KeySerializer = new XmlSerializer(typeof(TKey));
        XmlSerializer ValueSerializer = new XmlSerializer(typeof(TValue));

        while (reader.NodeType != XmlNodeType.EndElement)
        {
            reader.ReadStartElement("SerializableDictionary");
            reader.ReadStartElement("key");
            TKey tk = (TKey)KeySerializer.Deserialize(reader);
            reader.ReadEndElement();
            reader.ReadStartElement("value");
            TValue vl = (TValue)ValueSerializer.Deserialize(reader);
            reader.ReadEndElement();
            reader.ReadEndElement();
            this.Add(tk, vl);
            reader.MoveToContent();
        }
        reader.ReadEndElement();

    }
    public XmlSchema GetSchema()
    {
        return null;
    }
}

3.使用

  a.定义SerializableDictionary对象，这里以存储<string,string>键对为例：

SerializableDictionary<string, string> serializableDictionary = new SerializableDictionary<string, string>();

  b.添加元素

serializableDictionary.Add("Key1", “Value1”);
......

  c.序列化

using (FileStream fileStream = new FileStream(fileName, FileMode.Create))
{
    XmlSerializer xmlFormatter = new XmlSerializer(typeof(SerializableDictionary<string, string>));
    xmlFormatter.Serialize(fileStream, this.serializableDictionary);
}

    注：文件名fileName自己定义，如“file.xml”

  d.反序列化

using (FileStream fileStream = new FileStream(fileName, FileMode.Open))
{
    XmlSerializer xmlFormatter = new XmlSerializer(typeof(SerializableDictionary<string, string>));
    this.serializableDictionary = (SerializableDictionary<string,string>)xmlFormatter.Deserialize(fileStream);
}