public void EditXmlFile()
{
      XmlDocument xmlDoc = new XmlDocument();
      xmlDoc.Load("yourFile");
      XmlNode root = xmlDoc.DocumentElement;
      //if (root.HasChildNodes)
      //{
      //  return node.ChildNodes;
      //}
      /// 
      EditNode(root, "Book", "mingcheng", xmlDoc);
      xmlDoc.Save("yourFile");
}

private void EditNode(XmlNode node, string newName, string oldName, XmlDocument xmlDoc)
    {
      if(node.Name == oldName)
      {
        XmlNode newNode = xmlDoc.CreateNode(newName, node.LocalName, node.NamespaceURI);
        foreach(XmlAttribute a in node.Attributes)
        {
          if (a.Name == "genre")
          {
            XmlAttribute newAttr = xmlDoc.CreateAttribute("chuBanShe");
            newAttr.Value = a.Value;
            newNode.Attributes.Append(newAttr);
          }
          else if(a.Name != "publicationdate")
          {
            newNode.Attributes.Append(a);
          }
        }

        foreach(XmlNode n in node.ChildNodes)
        {
          newNode.AppendChild(n);
        }
        XmlNode parent = node.ParentNode;
        parent.ReplaceChild(newNode, node);
      }
    }

------解决方案--------------------

调试成功。注意，当我们Append一个XMLNode时，总是取第一个Node。

C# code

  {
      if (node.Name == oldName)
      {
        XmlNode newNode = xmlDoc.CreateNode(XmlNodeType.Element, newName, node.NamespaceURI);
        XmlAttributeCollection collection = node.Attributes;
        foreach (XmlAttribute a in collection)
        {
          if (a.Name == "genre")
 this.data