如何使用XmlSerializer反序列化为现有实例？

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

[Serializable]
public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Program
{
    public static void Main()
    {
        // 创建一个Person实例
        Person person = new Person { Name = "John", Age = 30 };

        // 序列化Person实例
        XmlSerializer xmlSerializer = new XmlSerializer(typeof(Person));
        using (FileStream fileStream = new FileStream("person.xml", FileMode.Create))
        {
            xmlSerializer.Serialize(fileStream, person);
        }

        // 反序列化Person实例
        using (FileStream fileStream = new FileStream("person.xml", FileMode.Open))
        {
            Person deserializedPerson = (Person)xmlSerializer.Deserialize(fileStream);
            Console.WriteLine($"Name: {deserializedPerson.Name}, Age: {deserializedPerson.Age}");
        }
    }
}