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  • 使用IXmlSerializable使创建可序列化的Dictionary

    默认情况下,XmlSerializer无法序列化字典,这样让使用XmlSerializer作文件缓存或存储方式或asmx服务无法使用IDictionary。这里可以通过实现IXmlSerializable接口来定制一个可序列化的字典SerializableDictionary<TKey, TValue>。

        /// <summary>
        
    /// 支持XML序列化的泛型Dictionary类 
        
    /// </summary>
        
    /// <typeparam name="TKey"></typeparam>
        
    /// <typeparam name="TValue"></typeparam>
        [XmlRoot("dictionary")]
        
    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)
            {
            }

            
    #region IXmlSerializable Members

            
    public 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));
                
    if (reader.IsEmptyElement || !reader.Read())
                {
                    
    return;
                }

                
    while (reader.NodeType != XmlNodeType.EndElement)
                {
                    reader.ReadStartElement(
    "item"); //cjb:2009-05-04

                    reader.ReadStartElement(
    "key");
                    TKey key 
    = (TKey) keySerializer.Deserialize(reader);
                    reader.ReadEndElement();

                    reader.ReadStartElement(
    "value");
                    TValue value 
    = (TValue) valueSerializer.Deserialize(reader);
                    reader.ReadEndElement();

                    reader.ReadEndElement(); 

                    
    this.Add(key, value);
                    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();
                }
            }

            
    #endregion
        }

    当然任意一种自定义类或者内置类型都可以通过实现IXmlSerializable来定制它们的可序列化格式

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  • 原文地址:https://www.cnblogs.com/chenjunbiao/p/1760319.html
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