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   Element, Ö¸ÐÎÈç<Name>Tom<Name>µÄ½Úµã¡£Ëü¿ÉÒÔ°üÀ¨£ºElement, Text, Comment, ProcessingInstruction, CDATA, and EntityReference.  
 
   Attribute, Ö¸ÔÚ<Employee >ÖеĴÖÌ岿·Ö¡£  
 
   Comment£¬Ö¸ÐÎÈ磺<!-- my comment --> µÄ½Úµã¡£  
 
   Text£¬Ö¸ÔÚ<Name>Tom<Name>µÄ´ÖÌ岿·Ö¡£  
 
  ÔÚXMLÖУ¬¿ÉÒÔÓÃXmlNode¶ÔÏóÀ´²ÎÕÕ¸÷ÖÖXMLÊý¾ÝÀàÐÍ¡£  
 
   2.1 ²éѯÒÑÖª¾ø¶Ô·¾¶µÄ½Úµã£¨¼¯£©  
 
   objNodeList = objDoc.SelectNodes(“Company/Department/Employees/Employee”)  
 
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   objNodeobjNodeList = 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  
 
   objNodeobjNode = objNode.SelectSingleNode(“/Company/Department/Employees/Employee”)  
 
   If Not (objNode is Nothing) then  
 
   ‘- Do process  
 
   End If  
 
   2.2 ²éѯÒÑÖªÏà¶Ô·¾¶µÄ½Úµã£¨¼¯£©  
 
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   objNode = objDoc.SelectSingleNode(“Company/Department”)  
 
   objNodeobjNodeList = objNode.SelectNodes(“../Department)  
 
   objNodeobjNode = objNode.SelectNode(“Employees/Employee”)  
 
   2.3 ²éѯÒÑÖªÔªËØÃûµÄ½Úµã£¨¼¯£©  
 
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Linq to XML customize distinct function

Definition comparer class,
class ItemComparer : IEqualityComparer<XElement>
{
public bool Equals(XElement x, XElement y)
{
return x.Attribute("Name").Value == x.Attribute("Name").Value;
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