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  objNodeList = objDoc.SelectNodes(“Company/Department/Employees/Employee”)
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  objNodeList = objNode.SelectNodes(“/Company/Department/Employees/Employee”)
  ÒÔÉÏÁ½ÖÖ·½·¨¿É·µ»ØÒ»¸öNodeList¶ÔÏó£¬Èç¹ûÒª·µ»Øµ¥¸ö½Úµã¿ÉʹÓÃSelectSingleNode·½·¨£¬¸Ã·½·¨Èç¹û²éѯµ½Ò»¸ö»ò¶à¸ö½Úµã£¬·µ»ØµÚÒ»¸ö½Úµã£»Èç¹ûûÓвéѯµÄÈκνڵ㷵»Ø Nothing¡£ÀýÈ磺
  objNode = objNode.SelectSingleNode(“/Company/Department/Employees/Employee”)
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  2.3 ²éѯÒÑÖªÔªËØÃûµÄ½Úµã£¨¼¯£©
  ÔÚʹÓò»¹æÔòµÄ²ã´ÎÎĵµÊ±£¬ÓÉÓÚ²»ÖªµÀÖмä²ã´ÎµÄÔªËØÃû£¬¿ÉʹÓÃ//·ûºÅÀ´Ô½¹ýÖмäµÄ½Úµã£¬²éѯÆä×Ó£¬Ëï»ò¶à²ã´ÎÏÂµÄÆäËûËùÓÐÔªËØ¡£ÀýÈ磺
  objNodeList = objDoc.SelectNodes(“Company//Employee”)
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