如何使用.NET XML API删除xmlns属性

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

namespace RemoveXmlnsAttribute
{
    class Program
    {
        static void Main(string[] args)
        {
            string xml = @"<?xml version=""1.0"" encoding=""utf-8""?>
<root xmlns=""http://www.example.com"">
 <element1>Text1</element1>
 <element2>Text2</element2>
</root>";

            XmlDocument doc = new XmlDocument();
            doc.LoadXml(xml);

            RemoveXmlns(doc.DocumentElement);

            string outputXml = doc.OuterXml;
            Console.WriteLine(outputXml);
        }

        static void RemoveXmlns(XmlElement element)
        {
            if (element.HasAttributes)
            {
                for (int i = element.Attributes.Count - 1; i >= 0; i--)
                {
                    XmlAttribute attribute = element.Attributes[i];
                    if (attribute.Name.StartsWith("xmlns:"))
                    {
                        element.RemoveAttributeNode(attribute);
                    }
                }
            }

            foreach (XmlNode childNode in element.ChildNodes)
            {
                if (childNode is XmlElement childElement)
                {
                    RemoveXmlns(childElement);
                }
            }
        }
    }
}