在序列化过程中，将c#类属性分组到XmlElement属性中

using System;
using System.Xml.Serialization;

[XmlRoot("Person")]
public class Person
{
    [XmlElement("PersonalInfo")]
    public PersonalInfo Personal { get; set; }

    [XmlElement("ContactInfo")]
    public ContactInfo Contact { get; set; }
}

public class PersonalInfo
{
    [XmlElement("Name")]
    public string Name { get; set; }

    [XmlElement("Age")]
    public int Age { get; set; }
}

public class ContactInfo
{
    [XmlElement("Email")]
    public string Email { get; set; }

    [XmlElement("Phone")]
    public string Phone { get; set; }
}

class Program
{
    static void Main()
    {
        Person person = new Person
        {
            Personal = new PersonalInfo { Name = "John Doe", Age = 30 },
            Contact = new ContactInfo { Email = "john.doe@example.com", Phone = "123-456-7890" }
        };

        XmlSerializer serializer = new XmlSerializer(typeof(Person));
        using (System.IO.StringWriter writer = new System.IO.StringWriter())
        {
            serializer.Serialize(writer, person);
            Console.WriteLine(writer.ToString());
        }
    }
}

<Person>
  <PersonalInfo>
    <Name>John Doe</Name>
    <Age>30</Age>
  </PersonalInfo>
  <ContactInfo>
    <Email>john.doe@example.com</Email>
    <Phone>123-456-7890</Phone>
  </ContactInfo>
</Person>