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 public override string SerializeToXml(object objArg)
  {
  if (objArg == null)
  return "";

  StringBuilder builder = new StringBuilder();
  try
  {
  //ÉùÃ÷Xmldocument¶ÔÏó
  _docXml = new XmlDocument();

  //´¦ÀíÃèÊöÐÅÏ¢
  _docXml.AppendChild(_docXml.CreateXmlDeclaration("1.0", "utf-8", "yes"));

  //ÐòÁл¯¶ÔÏó
  DoSirialAtFirst(objArg, _docXml);

  //дÈëµ½Builder¶ÔÏó
  XmlWriter writer = XmlWriter.Create(builder); 

  //±£´æ
  _docXml.Save(writer);
  }
  catch (Exception ex)
  {
  throw new Exception("¿Í»§¶ËÐòÁл¯¶ÔÏó³ö´í£¡",ex);
  }
  return builder.ToString();
  }
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XmlDocument.InsertBefore();

XmlDocument xmldoc =new ...
XmlDeclicration dec = xmldoc.CreateXmlDeclaration