XML转C#实体类还原XML异常求助：缺失命名空间等属性

先修正示例XML的语法错误 #

原示例中<PermissiblePurpose>标签未正确闭合，修正后如下：

<p:EIDVBusinessSearch xmlns:p="example.com" xmlns:xsi="abc.com" xsi:schemaLocation="cde.com">
  <PermissiblePurpose>
    <GLB>{{GLB}}</GLB>
    <DPPA>{{DPPA}}</DPPA>
    <VOTER>{{VOTER}}</VOTER>
  </PermissiblePurpose>
</p:EIDVBusinessSearch>

正确的C#实体类实现 #

通过XmlSerializer特性精准控制XML命名空间和前缀：

using System.Xml.Serialization;

[XmlRoot(ElementName = "EIDVBusinessSearch", Namespace = "example.com", Prefix = "p")]
public class EIDVBusinessSearch
{
    // 声明XML命名空间
    [XmlNamespaceDeclarations]
    public XmlSerializerNamespaces Xmlns { get; set; } = new XmlSerializerNamespaces();

    // 根元素的xsi:schemaLocation属性
    [XmlAttribute(AttributeName = "schemaLocation", Namespace = "abc.com")]
    public string SchemaLocation { get; set; } = "cde.com";

    [XmlElement(ElementName = "PermissiblePurpose")]
    public PermissiblePurpose PermissiblePurpose { get; set; }

    public EIDVBusinessSearch()
    {
        // 初始化命名空间绑定
        Xmlns.Add("p", "example.com");
        Xmlns.Add("xsi", "abc.com");
    }
}

public class PermissiblePurpose
{
    [XmlElement(ElementName = "GLB")]
    public string GLB { get; set; }

    [XmlElement(ElementName = "DPPA")]
    public string DPPA { get; set; }

    [XmlElement(ElementName = "VOTER")]
    public string VOTER { get; set; }
}

序列化代码示例 #

使用上述实体类生成符合要求的XML：

using System.IO;
using System.Xml.Serialization;

var request = new EIDVBusinessSearch
{
    PermissiblePurpose = new PermissiblePurpose
    {
        GLB = "{{GLB}}",
        DPPA = "{{DPPA}}",
        VOTER = "{{VOTER}}"
    }
};

var serializer = new XmlSerializer(typeof(EIDVBusinessSearch));
using var writer = new StringWriter();
serializer.Serialize(writer, request, request.Xmlns);
var outputXml = writer.ToString();

关键特性说明 #

• XmlRoot：指定根元素的命名空间和前缀，确保生成<p:EIDVBusinessSearch>标签
• XmlNamespaceDeclarations：用于定义XML文档中的命名空间声明（xmlns:p、xmlns:xsi）
• XmlAttribute：为根元素添加xsi:schemaLocation属性，匹配API要求的格式
• 子元素无p:前缀，因此无需额外指定命名空间，保持默认即可

内容的提问来源于stack exchange，提问作者Khan