如何使用XmlSerializer在c#中序列化google站点地图

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

public class GoogleSiteMap
{
    public string Url { get; set; }
    public DateTime LastModified { get; set; }
    public string ChangeFrequency { get; set; }
    public double Priority { get; set; }
}

public class Program
{
    public static void Main(string[] args)
    {
        var siteMap = new GoogleSiteMap
        {
            Url = "https://www.example.com/",
            LastModified = DateTime.Now,
            ChangeFrequency = "daily",
            Priority = 0.8
        };

        var serializer = new XmlSerializer(typeof(GoogleSiteMap));
        using var writer = new StringWriter();
        serializer.Serialize(writer, siteMap);

        var xml = writer.ToString();
        File.WriteAllText("sitemap.xml", xml);
    }
}