相当于解决的方式，就是在初始化的时候，指定一下XML根节点的名称

new XmlRootAttribute("AppSettings")

序列化：

var seri = new XmlSerializer(typeof(AppSettings), new XmlRootAttribute("AppSettings"));
using var writer = new StreamWriter(_path);
seri.Serialize(writer, configObj);

反序列化：

var seri = new XmlSerializer(typeof(AppSettings), new XmlRootAttribute("AppSettings"));
using var reader = new StreamReader(_path);
var config = seri.Deserialize(reader) as AppSettings;
if (config != null)
{
    config.Adapt(this);
}