C#:XPath选择包含子字符串属性的节点？

using System;
using System.Xml.XPath;

public class Program
{
    public static void Main()
    {
        string xml = @"<root>
                          <item name='apple' />
                          <item name='banana' />
                          <item name='orange' />
                        </root>";

        XPathDocument doc = new XPathDocument(new StringReader(xml));
        XPathNavigator nav = doc.CreateNavigator();

        // 选择包含子字符串属性的节点
        XPathNodeIterator nodes = nav.Select("//item[contains(@name, 'an')]");

        // 输出匹配的节点
        while (nodes.MoveNext())
        {
            Console.WriteLine(nodes.Current.OuterXml);
        }
    }
}

<item name="banana" />
<item name="orange" />