<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" ?>
<page>
</page>

想通过C#环境下DOM在<page></page>之间写入这样一行内容：
<xi:include href="pic1.xml" xmlns:xi="http://www.w3.org/2003/XInclude"/>
应该如何使用DOM来读写上述内容？谢谢。盼指点。谢谢。

   xmldoc.DocumentElement.AppendChild(oNewNode);
   Console.WriteLine(xmldoc.OuterXml);

   //匹配一节点
   XmlNamespaceManager nsmgr=new XmlNamespaceManager(xmldoc.NameTable);
   nsmgr.AddNamespace("xi","http://www.w3.org/2003/XInclude");
   
   XmlNode oNode=xmldoc.SelectSingleNode("//xi:include",nsmgr);
   if(oNode!=null)
    Console.WriteLine(oNode.OuterXml);
   else
    Console.WriteLine("none!");

   xmldoc.DocumentElement.AppendChild(oNewNode);
   
   XmlTextReader reader=new XmlTextReader(xmldoc.OuterXml,XmlNodeType.Document,null);
   
   while(reader.Read())
   {
    if(reader.NodeType==XmlNodeType.Element)
    {
     Console.WriteLine("Node:" + reader.Name);
     if(reader.HasAttributes)
     {
      while(reader.MoveToNextAttribute())
      {
       Console.WriteLine("attribute:" + reader.Name + ";;value:" + reader.Value);
      }
     }
    }
   }

   xmldoc.DocumentElement.AppendChild(oNewNode);
   reader(xmldoc.OuterXml);
   
   //Console.WriteLine(xmldoc.OuterXml);

   //匹配一节点
   XmlNamespaceManager nsmgr=new XmlNamespaceManager(xmldoc.NameTable);
   nsmgr.AddNamespace("xi","http://www.w3.org/2003/XInclude");
   
   XmlNode oNode=xmldoc.SelectSingleNode("//xi:include",nsmgr);
   if(oNode!=null)
    Console.WriteLine(oNode.OuterXml);
   else
    Console.WriteLine("none!");
  }
  private void reader(string sXml)
  {
   XmlTextReader reader=new XmlTextReader(sXml,XmlNodeType.Document,null);
   
   while(reader.Read())
   {
    if(reader.NodeType==XmlNodeType.Element)
    {
     Console.WriteLine("Node:" + reader.Name);
     if(reader.HasAttributes)
     {
      while(reader.MoveToNextAttribute())
      {
       Console.WriteLine("attribute:" + reader.Name + ";;value:" + reader.Value);
      }
     }
    }
   }
   reader.Close();
  }

首先在里面插入XInclude的内容：
public XmlDocument xmloutput()
{
XmlDocument pdoc=new XmlDocument();
pdoc=mydis.Insert("page.xml","pic.xml");//这步完成调试，如果将文件保存，显示正常

//？？？？就是这里需要调用xmlcreator的方法应该如何把pdoc的参数顺利传给xmlcreator,     
//然后返回一个经XInclude的XmlDocument,调用xmlcreator的参数传送不知道应该如何处理

return pagedoc;
}

//插入内容的方法：
public XmlDocument Insert(string filename,string includename)
{
XmlDocument mydoc=new XmlDocument();
mydoc.Load(Server.MapPath(filename));
XmlNode oNewNode=mydoc.CreateElement("xi","include","http://www.w3.org/2003/XInclude");
XmlAttribute attr=mydoc.CreateAttribute("href");
attr.Value=includename;
oNewNode.Attributes.Append(attr);
mydoc.DocumentElement.AppendChild(oNewNode);
return mydoc;
}

//执行XInclude的方法：（在这里面引用了MS的XInclude的库）
public XmlDocument xmlcreator(string xmlname)
{  
XmlTextReader r = new XmlTextReader(xmlname);
XIncludingReader xir = new XIncludingReader(r);
XmlDocument doc = new XmlDocument();
doc.Load(xir);
r.Close();
return doc;
}