有没有办法获得基于任意xml的System.Configuration.Configuration实例？

using System;
using System.Configuration;
using System.IO;
using System.Xml;

public class ConfigurationManagerExample
{
    public static void Main()
    {
        // 创建一个XML文档，其中包含您的配置信息
        string xmlConfig =
            @"<?xml version='1.0' encoding='utf-8'?>
           <configuration>
                <appSettings>
                    <add key='setting1' value='value1' />
                    <add key='setting2' value='value2' />
                </appSettings>
            </configuration>";

        // 将XML字符串转换为XML文档
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.LoadXml(xmlConfig);

        // 使用System.Configuration.ConfigurationManager类加载XML文档
        System.Configuration.Configuration config = ConfigurationManager.OpenMappedExeConfiguration(new ExeConfigurationFileMap { ExeConfigFilename = Path.GetTempFileName() }, ConfigurationUserLevel.None);
        config.AppSettings.Settings.Clear();
        config.Save();

        // 将XML文档中的appSettings节点添加到配置实例
        config.AppSettings.Settings.Add(xmlDoc.DocumentElement.SelectSingleNode("//appSettings").FirstChild);

        // 获取配置实例中的设置
        string setting1 = ConfigurationManager.AppSettings["setting1"];
        string setting2 = ConfigurationManager.AppSettings["setting2"];

        Console.WriteLine("Setting 1: " + setting1);
        Console.WriteLine("Setting 2: " + setting2);
    }
}