xml 序列化

using System.Text;
using System.Xml;
using System.Xml.Serialization;

var p = new Person
{
    Id = 1,
    Name = "Furion",
    Items = new List<string> { "Furion", "百小僧" }
};

var xml = XmlSerialize(p);

Console.ReadKey();

static string XmlSerialize(object obj)
{
    if (obj == null) throw new ArgumentNullException(nameof(obj));

    var xs = new XmlSerializer(obj.GetType());
    using var stream = new MemoryStream();
    var setting = new XmlWriterSettings
    {
        Encoding = new UTF8Encoding(false),
        Indent = true
    };

    using var writer = XmlWriter.Create(stream, setting);

    var ns = new XmlSerializerNamespaces();
    ns.Add(string.Empty, string.Empty);
    xs.Serialize(writer, obj, ns);

    return Encoding.UTF8.GetString(stream.ToArray());
}

[XmlRoot("person")]
public class Person
{
    [XmlAttribute("id")]
    public int Id { get; set; }

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

    [XmlArray("items")]
    [XmlArrayItem("item")]
    public List<string> Items { get; set; }
}