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。
  

 1    /**//// <summary>
 2    /// 支持XML序列化的泛型 Dictionary
 3    /// </summary>
 4    /// <typeparam name="TKey"></typeparam>
 5    /// <typeparam name="TValue"></typeparam>
 6    [XmlRoot("dictionary")]
 7    public class SerializableDictionary<TKey, TValue> 
 8        : Dictionary<TKey, TValue>, IXmlSerializable
 9    {
10

 #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
11        IXmlSerializable Members#region IXmlSerializable Members 
12        public System.Xml.Schema.XmlSchema GetSchema()
13        {   
14            return null;   
15        }     
16
17        /**//// <summary>
18        /// 从对象的 XML 表示形式生成该对象
19        /// </summary>
20        /// <param name="reader"></param>
21        public void ReadXml(System.Xml.XmlReader reader)
22        {
23
24            XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
25            XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue)); 
26            bool wasEmpty = reader.IsEmptyElement;   
27            reader.Read();     
28
29            if (wasEmpty)   
30                return;     
31            while (reader.NodeType != System.Xml.XmlNodeType.EndElement)     
32            {   
33                reader.ReadStartElement("item");  
34                reader.ReadStartElement("key");   
35                TKey key = (TKey)keySerializer.Deserialize(reader);  
36                reader.ReadEndElement();   
37                reader.ReadStartElement("value");  
38                TValue value = (TValue)valueSerializer.Deserialize(reader); 
39                reader.ReadEndElement();   
40                this.Add(key, value); 
41                reader.ReadEndElement();
42                reader.MoveToContent();
43
44            }             
45            reader.ReadEndElement();
46
47        }
48
49
50        /**//// <summary>
51        /// 将对象转换为其 XML 表示形式
52        /// </summary>
53        /// <param name="writer"></param>
54        public void WriteXml(System.Xml.XmlWriter writer)
55        {
56
57            XmlSerializer keySerializer = new XmlSerializer(typeof(TKey)); 
58            XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue)); 
59            foreach (TKey key in this.Keys)
60            {  
61                writer.WriteStartElement("item");
62                writer.WriteStartElement("key"); 
63                keySerializer.Serialize(writer, key);  
64                writer.WriteEndElement();      
65                writer.WriteStartElement("value");
66                TValue value = this[key];     
67                valueSerializer.Serialize(writer, value);   
68                writer.WriteEndElement();    
69                writer.WriteEndElement();
70            }
71
72        }
73
74        #endregion
75
76    }