c# - XmlDocument - 带有命名空间的 SelectSingleNode

Question

这是我的代码:

XmlTextReader reader = new XmlTextReader(xmlPath);
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(reader);
XmlNode root = xmlDoc.DocumentElement;

XmlNode node = root.SelectSingleNode("marketingid");

有效的 XML:

<confirmsubmit>
    <marketingid>-1</marketingid>
</confirmsubmit>

无效的 XML:

<confirmsubmit xmlns="http:....">
    <marketingid>-1</marketingid>
</confirmsubmit>

xmlns属性的处理方式是什么，如何解析？

和命名空间有关系吗？

编辑:这是有效的代码:

XmlTextReader reader = new XmlTextReader(xmlPath);
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(reader);

XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("ns", xmlDoc.DocumentElement.NamespaceURI);

XmlNode book = xmlDoc.SelectSingleNode("/ns:confirmsubmit/ns:marketingid", nsmgr);

所有的 XPath 比看起来要复杂得多，我建议像我这样的初学者阅读:http://www.w3schools.com/xpath/xpath_syntax.asp

Answer 1

您需要在游戏中添加一个XmlNamespaceManager 实例，如本例所示来自documentation :

public class Sample
{
    public static void Main()
    {

      XmlDocument doc = new XmlDocument();
      doc.Load("booksort.xml");

      //Create an XmlNamespaceManager for resolving namespaces.
      XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
      nsmgr.AddNamespace("bk", "urn:samples");

      //Select and display the value of all the ISBN attributes.
      XmlNodeList nodeList;
      XmlElement root = doc.DocumentElement;
      nodeList = root.SelectNodes("/bookstore/book/@bk:ISBN", nsmgr);
      foreach (XmlNode isbn in nodeList){
        Console.WriteLine(isbn.Value);
      }

    }
}