如何使用C#从XML中删除重复的属性

using System;
using System.Linq;
using System.Xml.Linq;

class Program
{
    static void Main(string[] args)
    {
        string xml = @"<root>
                         <element attribute1='value1' attribute2='value2' attribute1='value3' />
                         <element attribute1='value4' attribute2='value5' />
                      </root>";

        XDocument doc = XDocument.Parse(xml);

        foreach (XElement element in doc.Descendants().Where(e => e.HasAttributes))
        {
            RemoveDuplicateAttributes(element);
        }

        Console.WriteLine(doc.ToString());
    }

    static void RemoveDuplicateAttributes(XElement element)
    {
        var attributes = element.Attributes().GroupBy(a => a.Name).Select(g => g.Last()).ToList();
        foreach (var attribute in attributes)
        {
            attribute.Remove();
            element.Add(attribute);
        }
    }
}