.NET中的XPath SelectNodes

  <book>
   <title>Book 1</title>
   <author>Author 1</author>
  </book>
  <book>
   <title>Book 2</title>
   <author>Author 2</author>
  </book>
</books>

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml<books><book><title>Book 1</title<author>Author 1</author></book><book><title>Book 2</title<author>Author 2</author></book></books>");

XmlNodeList nodes = xmlDoc.SelectNodes("//book");

foreach (XmlNode node in nodes)
{
    Console.WriteLine(node.OuterXml);
}

<book>
 <title>Book 1</title>
 <author>Author 1</author>
</book>
<book>
 <title>Book 2</title>
 <author>Author 2</author>
</book>