中文XML论坛--vs2005.net 中操作xml的问题？请高手帮忙！！

贴子主题： vs2005.net 中操作xml的问题？请高手帮忙！！

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我在用vs2005.net操作xml中总找不到所的结点，为什么？代码如下
System.Xml.XmlDocument pDoc =new System.Xml.XmlDocument();
System.Xml.XmlDocument pDoc1 =new System.Xml.XmlDocument();
System.Xml.XmlNode pNode,pNode1;
System.Xml.XmlNodeList pNodeList,pNodes2;
pDoc.Load("d:\\document.xml");

      System.Xml.XmlNamespaceManager xmlns = new system.Xml.XmlNamespaceManager(pDoc.NameTable);
//     xmlns.AddNamespace(String.Empty, "http://tempuri.org/mydefaultnamespace");
      xmlns.AddNamespace("w", "http://schemas.openxmlformats.org/officeDocument/2006/math");
  pNodeList=pDoc.SelectNodes("//w:p",xmlns);
  pNode1 =pNodeList.Item(2);

xml如下：<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<w:document xmlns:ve="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing" xmlns:w10="urn:schemas-microsoft-com:office:word" xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main" xmlns:wne="http://schemas.microsoft.com/office/word/2006/wordml">
<w:body>
  <w:p w:rsidR="00247062" w:rsidRPr="00DC0EA8" w:rsidRDefault="00247062" w:rsidP="00247062">
   <w:r w:rsidRPr="00DC0EA8">
    <w:rPr>
     <w:rFonts w:hint="eastAsia"/>
     <w:b/>
     <w:color w:val="000000"/>
    </w:rPr>
    <w:t>探索xml</w:t>
   </w:r>
</w:body>
</w:document>


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