C# XML序列化：保留列表包装标签，移除列表项包装标签

要实现保留PartnerContacts包装标签，同时移除每个PartnerContact项的包裹标签，直接将联系人的属性元素放在PartnerContacts下，推荐以下两种实现方式：

方法一：实现IXmlSerializable接口自定义序列化 #

这种方式可以完全控制XML生成结构，精准匹配你的需求：

修改Partner类并实现IXmlSerializable接口：

using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;

public class Partner : IXmlSerializable
{
    public List<PartnerContact> PartnerContacts { get; set; } = new List<PartnerContact>();

    public XmlSchema GetSchema() => null;

    public void ReadXml(XmlReader reader)
    {
        // 按需实现反序列化逻辑，示例仅处理核心结构
        reader.ReadStartElement("Partner");
        if (reader.Name == "PartnerContacts")
        {
            reader.ReadStartElement("PartnerContacts");
            while (reader.Name == "ContactType")
            {
                var contact = new PartnerContact
                {
                    ContactType = reader.ReadElementContentAsString(),
                    Name = reader.ReadElementContentAsString("Name", ""),
                    PhoneNumber = reader.ReadElementContentAsString("PhoneNumber", ""),
                    EmailAddress = reader.ReadElementContentAsString("EmailAddress", "")
                };
                PartnerContacts.Add(contact);
            }
            reader.ReadEndElement();
        }
        reader.ReadEndElement();
    }

    public void WriteXml(XmlWriter writer)
    {
        writer.WriteStartElement("PartnerContacts");
        foreach (var contact in PartnerContacts)
        {
            writer.WriteElementString("ContactType", contact.ContactType);
            writer.WriteElementString("Name", contact.Name);
            writer.WriteElementString("PhoneNumber", contact.PhoneNumber);
            writer.WriteElementString("EmailAddress", contact.EmailAddress);
        }
        writer.WriteEndElement();
    }
}

public class PartnerContact
{
    public string ContactType { get; set; }
    public string Name { get; set; }
    public string PhoneNumber { get; set; }
    public string EmailAddress { get; set; }
}

方法二：使用XmlAttributeOverrides动态配置序列化规则 #

如果不想修改原有类结构，可以通过动态属性覆盖实现：

using System.Xml.Serialization;

var overrides = new XmlAttributeOverrides();

// 移除PartnerContact的默认包裹标签
var contactAttrs = new XmlAttributes { XmlRoot = null };
overrides.Add(typeof(PartnerContact), contactAttrs);

// 配置PartnerContacts为包装标签，并指定内部属性的序列化方式
var listAttrs = new XmlAttributes();
listAttrs.XmlArray = new XmlArrayAttribute("PartnerContacts");

// 为每个联系人属性添加XmlElement标记，让属性直接作为包装标签的子元素
foreach (var prop in typeof(PartnerContact).GetProperties())
{
    listAttrs.XmlArrayItems.Add(new XmlElementAttribute(prop.Name));
}
overrides.Add(typeof(Partner), "PartnerContacts", listAttrs);

// 使用自定义配置的序列化器
var serializer = new XmlSerializer(typeof(Partner), overrides);

测试序列化代码 #

以方法一为例，测试代码如下：

var partner = new Partner
{
    PartnerContacts = new List<PartnerContact>
    {
        new PartnerContact
        {
            ContactType = "AR",
            Name = "John Doe",
            PhoneNumber = "0123456789",
            EmailAddress = "test@test.com"
        },
        new PartnerContact
        {
            ContactType = "OR",
            Name = "John Does wife",
            PhoneNumber = "987654321",
            EmailAddress = "test@test.com"
        }
    }
};

using var writer = new StringWriter();
var serializer = new XmlSerializer(typeof(Partner));
serializer.Serialize(writer, partner);
Console.WriteLine(writer.ToString());

运行后会输出你期望的XML结构：

<Partner>
  <PartnerContacts>
    <ContactType>AR</ContactType>
    <Name>John Doe</Name>
    <PhoneNumber>0123456789</PhoneNumber>
    <EmailAddress>test@test.com</EmailAddress>
    <ContactType>OR</ContactType>
    <Name>John Does wife</Name>
    <PhoneNumber>987654321</PhoneNumber>
    <EmailAddress>test@test.com</EmailAddress>
  </PartnerContacts>
</Partner>

内容的提问来源于stack exchange，提问作者D. Brugmans