将 XML 反序列化为对象时缺少子节点

本文关键字:子节点 对象 XML 反序列化 | 更新日期: 2023-09-27 17:55:55

我需要处理某些xml,但无法从中反序列化对象列表。以下是 xml:

<catalog>
<item>
    <id>18338517</id>
    <note label="Name ">Gear xyz</note>
    <note label="Size ">10</note>       
    <note label="Source">Store xyz</note>
    <relation weight="100">
        <type>External</type>
        <id>123</id>
        <name>Mcday</name>          
    </relation>
    <relation weight="99">
        <type>Internal</type>
        <id>234</id>
        <name>Mcnight</name>
    </relation>
</item>
    <item> ..... </item></catalog>

以下是我的课程

[XmlRoot("catalog")]
public class Catalog
{
    [XmlArray("item")]
    [XmlArrayItem("item", typeof(Item))]
    public Item[] item{ get; set; }
}
[XmlRoot("item")]
public class Item
{
    [XmlElement("id")]
    public string id { get; set; }
    [XmlArrayItem("note", typeof(Note))]
    public Note[] note { get; set; }
    [XmlArrayItem("relation", typeof(Relation))]
    public Relation[] relation { get; set; }
}
[Serializable]
public class Note
{
    [XmlAttribute("label")]
    public string label { get; set; }
    [XmlText]
    public string Value { get; set; }
}
[Serializable]
public class Relation
{
    [XmlAttribute("weight")]
    public string weight { get; set; }
    [XmlText]
    public string Value { get; set; }
    [XmlElement("id")]
    public string id { get; set; }
    [XmlElement("type")]
    public string type { get; set; }
    [XmlElement("name")]
    public string name { get; set; }
}

最后,调用反序列化

Catalog catalog = null;
XmlSerializer mySerializer = new XmlSerializer(typeof(Catalog));
using (TextReader reader = new StreamReader(@"D:'TEMP'deserialize xml'catalog.xml"))
{
    catalog = (Catalog)mySerializer.Deserialize(reader);
}

它不返回任何错误,只返回目录对象中的空项。

将 XML 反序列化为对象时缺少子节点

要使用 XmlArrayXmlArrayItem 属性,就像您在此处所做的那样:

[XmlArray("term")]
[XmlArrayItem("term", typeof(Item))]
public Item[] item{ get; set; }

您的 XML 必须实际提供正确的集合元素。所以你的类应该看起来像

[XmlRoot("catalog")]
public class Catalog
{
    [XmlArray("items")] // note that I corrected 'term' to 'items'/'item'
    [XmlArrayItem("item", typeof(Item))]
    public Item[] item{ get; set; }
}

你的XML应该看起来像

<catalog>
  <items>
    <item>
      <id>18338517</id>
       ...

请注意对应于 [XmlArray("items")]<items> 元素和对应于 [XmlArrayItem("item", typeof(Item))] 的子元素<item>

如果您不想/无法更改 XML 格式,则 use 可以简单地使用 XmlElement 属性而不是 XmlArrayItem 属性。因此,您的最终代码应如下所示:

[XmlRoot("catalog")]
public class Catalog
{
     [XmlElement("item")] // no XmlArray/XmlArrayItem, just XmlElement
     public Item[] Items { get; set; }
}
[XmlType("item")]
public class Item
{
    [XmlElement("id")]
    public string id { get; set; }
    [XmlElement("note", typeof(Note))] // no XmlArray/XmlArrayItem, just XmlElement
    public Note[] note { get; set; }
    [XmlElement("relation", typeof(Relation))] // no XmlArray/XmlArrayItem, just XmlElement
    public Relation[] relation { get; set; }
}
[Serializable]
public class Note
{
    [XmlAttribute("label")]
    public string label { get; set; }
    [XmlText]
    public string Value { get; set; }
}
[Serializable]
public class Relation
{
    [XmlAttribute("weight")]
    public string weight { get; set; }
    [XmlText]
    public string Value { get; set; }
    [XmlElement("id")]
    public string id { get; set; }
    [XmlElement("type")]
    public string type { get; set; }
    [XmlElement("name")]
    public string name { get; set; }
}

您的属性是错误的:

public class Catalog
{
    [XmlArray("term")]
    [XmlArrayItem("term", typeof(Item))]

试试这个:

public class Catalog
{
    [XmlArray("items")]
    [XmlArrayItem("item", typeof(Item))]

编辑:为了进一步开发项目,应考虑创建XML架构并使用XSD生成代码.exe例如,请参阅此问题:反序列化xml-to-objects-in-c-sharp

编辑2:查看MSDN,XmlArrayAttribute构造函数定义为:

public XmlArrayAttribute(
    string elementName
)

其中参数记录为:

元素名称 类型:系统字符串

The name of the XML element that the XmlSerializer generates.