Check if XML Element exists

Question

How can someone validate that a specific element exists in an XML file  Say I have an ever changing XML file and I need to verify every element exists before reading parsing it

User · Answer

additionally to sangam code  if  chNode  innerNode    innermostNode    null              return true    node     parentNode  innerNode innermostNode exists

User · Answer

if the problem is  just  to verify that the element exist in the xml-file before you   extract the value you could do like this  XmlNodeList YOURTEMPVARIABLE   doc GetElementsByTagName  YOUR ELEMENTNAME             if  YOURTEMPVARIABLE Count  gt  0                         doctype   YOURTEMPVARIABLE 0  InnerXml                     else                       doctype

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I am finding childnode ERNO at 2nd but last place  If StrComp xmlnode i  ChildNodes Item xmlnode i  ChildNodes Count - 1  Name ToString     ERNO   CompareMethod Text    0 Then                 xmlnode i  ChildNodes Item xmlnode i  ChildNodes Count - 1  InnerText   c             Else                 elem   xmldoc CreateElement  ERNo                   elem InnerText   c ToString                 root ChildNodes i  AppendChild elem              End If

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You can iterate through each and every node and see if a node exists   doc Load xmlPath           XmlNodeList node   doc SelectNodes    Nodes Node            foreach  XmlNode chNode in node                        try              if  chNode  innerNode    null                  return true    node exists               if     check for any other nodes you need to              catch Exception e  return false    some node doesn t exists               You iterate through every Node elements under Nodes  say this is root  and check to see if node named  innerNode   add others if you need  exists  try  catch is because I suspect this will throw popular  object reference not set  error if the node does not exist

User · Answer

Not sure what you re wanting to do but using a DTD or schema might be all you need to validate the xml    Otherwise  if you want to find an element you could use an xpath query to search for a particular element

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Following is a simple function to check if a particular node is present or not in the xml file    public boolean envParamExists String xmlFilePath  String paramName       try          Document doc   DocumentBuilderFactory newInstance   newDocumentBuilder   parse new File xmlFilePath            doc getDocumentElement   normalize            if doc getElementsByTagName paramName  getLength   gt 0              return true          else             return false       catch  Exception e              error handling           return false

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string name    quot some node name quot       var xDoc   XDocument Load  quot yourFile quot        var docRoot   xDoc Element  quot your docs root name quot          var aNode   docRoot Elements   Where x   gt  x Name    name  FirstOrDefault                    if  aNode    null                                        return   quot file has no  name  quot

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Check xml element value if exists using XmlReader             using  XmlReader xmlReader   XmlReader Create new StringReader  XMLSTRING                                  if  xmlReader ReadToFollowing  XMLNODE                                            string nodeValue   xmlReader ReadElementString  XMLNODE

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How about trying this    using  XmlTextReader reader   new XmlTextReader xmlPath         while  reader Read                  if  reader NodeType    XmlNodeType Element                           do your code here

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You can validate that and much more by using an XML schema language  like XSD   If you mean conditionally  within code  then XPath is worth a look as well

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if doc SelectSingleNode    mynode    null        Should do it  where doc is your XmlDocument object  obviously   Alternatively you could use an XSD and validate against that

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A little bit late  but if it helps  this works for me     XmlNodeList NodoEstudios   DocumentoXML SelectNodes    ALUMNOS ALUMNO  id       Id        estudios     string Proyecto        foreach XmlElement ElementoProyecto in NodoEstudios        XmlNodeList EleProyecto   ElementoProyecto GetElementsByTagName  proyecto        Proyecto    EleProyecto 0     null      EleProyecto 0  InnerText

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Just came across the same problem and the null-coalescing operator with SelectSingleNode worked a treat  assigning null with string Empty    foreach  XmlNode txElement in txElements          var txStatus   txElement SelectSingleNode     ns TxSts   nsmgr  InnerText    string Empty       var endToEndId   txElement SelectSingleNode     ns OrgnlEndToEndId   nsmgr  InnerText    string Empty       var paymentAmount   txElement SelectSingleNode     ns InstdAmt   nsmgr  InnerText    string Empty       var paymentAmountCcy   txElement SelectSingleNode     ns InstdAmt   nsmgr  Attributes  Ccy   Value    string Empty       var clientId   txElement SelectSingleNode     ns OrgnlEndToEndId   nsmgr  InnerText    string Empty       var bankSortCode   txElement SelectSingleNode     ns OrgnlEndToEndId   nsmgr  InnerText    string Empty           TODO finish Object creation and Upsert DB

[c#] Check if XML Element exists

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