XML Serializable Generic Dictionary

    .net 2.0 泛型Dictionary不支持 XML serializable.  下面是一个实现IXmlSerializable 接口实现支持Serialize的泛型集合.Dictionary 。 Dictionary<TKey, TValue>本身实现了ISerializable接口，WebService中无法实现序列化，具体是什么原因它不支持XML序列化。
  

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    /**//// <summary>
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    /// 支持XML序列化的泛型 Dictionary
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    /// </summary>
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    /// <typeparam name="TKey"></typeparam>
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    /// <typeparam name="TValue"></typeparam>
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    [XmlRoot("dictionary")]
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    public class SerializableDictionary<TKey, TValue> 
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        : Dictionary<TKey, TValue>, IXmlSerializable
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{
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 #region 构造函数
        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)
        {        }
        #endregion
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        IXmlSerializable Members#region IXmlSerializable Members 
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        public System.Xml.Schema.XmlSchema GetSchema()
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{   
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            return null;   
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        }     
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        /**//// <summary>
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        /// 从对象的 XML 表示形式生成该对象
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        /// </summary>
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        /// <param name="reader"></param>
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        public void ReadXml(System.Xml.XmlReader reader)
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{
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            XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
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            XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue)); 
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            bool wasEmpty = reader.IsEmptyElement;   
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            reader.Read();     
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            if (wasEmpty)   
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                return;     
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            while (reader.NodeType != System.Xml.XmlNodeType.EndElement)     
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{   
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                reader.ReadStartElement("item");  
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                reader.ReadStartElement("key");   
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                TKey key = (TKey)keySerializer.Deserialize(reader);  
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                reader.ReadEndElement();   
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                reader.ReadStartElement("value");  
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                TValue value = (TValue)valueSerializer.Deserialize(reader); 
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                reader.ReadEndElement();   
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                this.Add(key, value); 
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                reader.ReadEndElement();
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                reader.MoveToContent();
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            }             
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            reader.ReadEndElement();
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        }
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        /**//// <summary>
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        /// 将对象转换为其 XML 表示形式
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        /// </summary>
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        /// <param name="writer"></param>
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        public void WriteXml(System.Xml.XmlWriter writer)
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{
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            XmlSerializer keySerializer = new XmlSerializer(typeof(TKey)); 
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            XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue)); 
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            foreach (TKey key in this.Keys)
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{  
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                writer.WriteStartElement("item");
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                writer.WriteStartElement("key"); 
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                keySerializer.Serialize(writer, key);  
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                writer.WriteEndElement();      
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                writer.WriteStartElement("value");
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                TValue value = this[key];     
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                valueSerializer.Serialize(writer, value);   
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                writer.WriteEndElement();    
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                writer.WriteEndElement();
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            }
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        }
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        #endregion
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    }