XML Serializable Generic Dictionary

最新推荐文章于 2024-04-09 09:36:18 发布

chen_xizhang

最新推荐文章于 2024-04-09 09:36:18 发布

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分类专栏： [网站分类]C# [随笔分类]Microsoft .NET 文章标签： dictionary xml system class .net null

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本文详细介绍了如何通过实现 IXmlSerializable 接口来使 .NET 2.0 中的 Dictionary 类支持 XML 序列化。包括代码片段展示如何在自定义 Dictionary 类中实现序列化和反序列化过程。

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参考地址：http://weblogs.asp.net/pwelter34/archive/2006/05/03/444961.aspx

简述：默认情况下，Dictionary是不支持XML序列化的，为了达到这个目的，我们需要自定义一个类型来做

For some reason, the generic Dictionary in .net 2.0 is not XML serializable.

The following code snippet is a xml serializable generic dictionary.

The dictionary is serialzable by implementing the IXmlSerializable interface.

    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Xml.Serialization;
 
    [XmlRoot("dictionary")]
    public class SerializableDictionary
 
  
        : Dictionary
  
   , IXmlSerializable
    {
        
   #region IXmlSerializable Members
        
   public System.Xml.Schema.XmlSchema GetSchema()
        {
            
   return 
   null;
        }
 
        
   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();
        }
 
        
   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
    }
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