XML-сериализация IP-адреса в C#

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
 
using System.Xml.Serialization;
using System.IO;
 
namespace SerializationTest
{
    public enum MyEnum { enum1, enum2, enum3 }
 
    [Serializable]
    public class Test
    {
        public Test()
        {
            a = 1;
            b = true;
            s = "string";
            ip = IPAddress.Loopback;
        }
 
        public int a;
        public bool b;
        public string s;
        public MyEnum e;
 
        [XmlElement(ElementName = "IPAddress")]
        public string IPAddressAsString
        {
            get { return ip != null ? ip.ToString() : null; }
            set
            {
                IPAddress a;
                if (value != null && IPAddress.TryParse(value, out a))
                    ip = a;
                else
                    ip = null;
            }
        }
 
        [XmlIgnore]
        public IPAddress ip { get; set; }
    }
 
    class Program
    {
        static void Main(string[] args)
        {
            Test test = new Test();
 
            XmlSerializer xs = new XmlSerializer(typeof(Test));
            FileStream writer = new FileStream("file.xml", FileMode.OpenOrCreate);
            xs.Serialize(writer, test);
            writer.Close();
        }
    }
}