支持 XML 序列化的 Dictionary

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Xml.Serialization;
 using System.Xml;
 using System.Xml.Schema;
 using System.Runtime.Serialization;

     /// <summary>
     /// 标题：支持 XML 序列化的 Dictionary
     /// </summary>
     /// <typeparam name="TKey"></typeparam>
     /// <typeparam name="TValue"></typeparam>
     [XmlRoot("SerializableDictionary")]
     public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable
     {

         public SerializableDictionary()
             : base()
         {
         }
         public SerializableDictionary(IDictionary<TKey, TValue> dictionary)
             : base(dictionary)
         {
         }

         public SerializableDictionary(IEqualityComparer<TKey> comparer)
             : base(comparer)
         {
         }

         public SerializableDictionary(int capacity)
             : base(capacity)
         {
         }
         public SerializableDictionary(int capacity, IEqualityComparer<TKey> comparer)
             : base(capacity, comparer)
         {
         }
         protected SerializableDictionary(SerializationInfo info, StreamingContext context)
             : base(info, context)
         {
         }

         public System.Xml.Schema.XmlSchema GetSchema()
         {
             return null;
         }
         /// <summary>
         /// 从对象的 XML 表示形式生成该对象
         /// </summary>
         /// <param name="reader"></param>
         public void ReadXml(System.Xml.XmlReader reader)
         {
             XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
             XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
             bool wasEmpty = reader.IsEmptyElement;
             reader.Read();
             if (wasEmpty)
                 return;
             while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
             {
                 reader.ReadStartElement("item");
                 reader.ReadStartElement("key");
                 TKey key = (TKey)keySerializer.Deserialize(reader);
                 reader.ReadEndElement();
                 reader.ReadStartElement("value");
                 TValue value = (TValue)valueSerializer.Deserialize(reader);
                 reader.ReadEndElement();
                 this.Add(key, value);
                 reader.ReadEndElement();
                 reader.MoveToContent();
             }
             reader.ReadEndElement();
         }

         /**/
         /// <summary>
         /// 将对象转换为其 XML 表示形式
         /// </summary>
         /// <param name="writer"></param>
         public void WriteXml(System.Xml.XmlWriter writer)
         {
             XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
             XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
             foreach (TKey key in this.Keys)
             {
                 writer.WriteStartElement("item");
                 writer.WriteStartElement("key");
                 keySerializer.Serialize(writer, key);
                 writer.WriteEndElement();
                 writer.WriteStartElement("value");
                 TValue value = this[key];
                 valueSerializer.Serialize(writer, value);
                 writer.WriteEndElement();
                 writer.WriteEndElement();
             }
         }

     }