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Return XML array element number in Xpath

Posted on 2011-09-21
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Last Modified: 2013-11-11
I have the following XML:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <ns2:findAllRolesResponse xmlns:ns2="http://x.xx.xxx.com/" xmlns:ns3="http://x.xx.xx.com/">
      <return>
        <description>HOUSEMAN</description>      
      </return>
      <return>
        <description>AM HOUSEKEEPER</description>    
      </return>    
      <return>
        <description>CLERK</description>    
      </return>      
    </ns2:findAllRolesResponse>
  </soap:Body>
</soap:Envelope>

When the attached code - recursive method called ProcessNodes - runs it produces the xpath without the array number:
     
-----------------------------
row: 2
name:      description
xpath1:      /soap:Envelope/soap:Body/ns2:findAllRolesResponse/return/description
value1:      HOUSEMAN
   
-----------------------------
row: 4
name:      description
xpath1:      /soap:Envelope/soap:Body/ns2:findAllRolesResponse/return/description
value1:      AM HOUSEKEEPER
   
-----------------------------
row: 6
name:      description
xpath1:      /soap:Envelope/soap:Body/ns2:findAllRolesResponse/return/description
value1:      CLERK
-----------------------------

What I would like is the xpath array element number added to the xpath.  So, for example:

name:      description
xpath1:      /soap:Envelope/soap:Body/ns2:findAllRolesResponse/return[1]/description
value1:      HOUSEMAN

name:      description
xpath1:      /soap:Envelope/soap:Body/ns2:findAllRolesResponse/return[2]/description
value1:      AM HOUSEKEEPER


Any ideas?

Thanks in advance.

private void LoadXmlToGrid()
        {
            //load xml, get xpath value pairs, bind to gridview            
            try
            {
                m_XmlDoc.Load(m_XmlFileName);

                DataTable myDataTable = new DataTable();

                myDataTable.Columns.Add("name");
                myDataTable.Columns.Add("xpath1");
                myDataTable.Columns.Add("value1");

                //set node path to start the xpath query build
                XmlNode XpathNodes = m_XmlDoc.SelectSingleNode("/*[local-name(.)='Envelope'][1]/*[local-name(.)='Body'][1]/*[local-name(.)='findAllRolesResponse']");
                                
                //get xpath value pair; save to datatable
                ProcessNode(XpathNodes, myDataTable);

                //bind to datagrid view
                //dgXpath.AutoGenerateColumns = false;
                dgXpath.DataSource = myDataTable;
              
            }

        //recursive method to read xml file to get xpath value pair
        private void ProcessNode(XmlNode node, DataTable table)
        {
            try
            {
                StringBuilder xpath = new StringBuilder();
                XmlNode temp = node;
                XmlNodeList children = node.SelectNodes("*");
                
                while (temp.ParentNode != null && temp.Name != "#document")
                {
                    xpath.Insert(0, "/" + temp.Name);
                    temp = temp.ParentNode;                   
                }

                string value = children.Count > 0 ? string.Empty : node.InnerText;

                table.Rows.Add(new object[] { node.Name, xpath.ToString(), value });

               
                foreach (XmlNode child in children)
                {
                   
                    if (child.NodeType == XmlNodeType.Element)
                    {
                        ProcessNode(child, table);                     
                    }
                }
                
            }
            catch (Exception e)
            {
                Debug.WriteLine(e.ToString());
            }
        }

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Question by:j420exe1
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5 Comments
 
LVL 35

Expert Comment

by:Robert Schutt
ID: 36578946
Well, if you're only interested in 'description' nodes, and there's only ever 1 in a 'return' node, then an easy way would be to use a global variable and append the index yourself when prefixing your stringbuilder with the current node name:

        private int m_Counter = 0;

        private void ProcessNode(XmlNode node, DataTable table)
        {
            try
            {
                StringBuilder xpath = new StringBuilder();
                XmlNode temp = node;
                XmlNodeList children = node.SelectNodes("*");
                
                while (temp.ParentNode != null && temp.Name != "#document")
                {
                    if (node.Name == "description" && temp.Name == "return") {
                        ++m_Counter;
                        xpath.Insert(0, "]").Insert(0, m_Counter.ToString()).Insert(0, "[");
                    }
                    xpath.Insert(0, "/" + temp.Name);
                    temp = temp.ParentNode;                   
                }
...

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Author Comment

by:j420exe1
ID: 36579516
No, the XML could contain 1 to many elements and nested elements.  The goal is to crawl the XML and return the xpath value pair so the code needs to be dynamic enough to handle all variations of the xml soap message.
0
 
LVL 35

Expert Comment

by:Robert Schutt
ID: 36580157
ah, well to do it properly I think we should add an xsd schema to the xml, but it just might be possible without that.

Would it be terribly inconvenient if any single occurrences would have a [1] after the name?
0
 
LVL 35

Accepted Solution

by:
Robert Schutt earned 2000 total points
ID: 36580220
ah, forget that last remark, I built in another check.

        private void ProcessNode(XmlNode node, DataTable table, StringBuilder xpath)
        {
            try
            {
                if (xpath == null)
                    xpath = new StringBuilder();

                xpath.Append("/" + node.Name);

                int cnt = 1;
                XmlNode tmptmp = node;
                do {
                    tmptmp = tmptmp.PreviousSibling;
                    if (tmptmp != null && tmptmp.Name == node.Name)
                        cnt++;
                } while (tmptmp != null);
                if (cnt == 1) {
                    tmptmp = node;
                    bool fnd = false;
                    do {
                        tmptmp = tmptmp.NextSibling;
                        if (tmptmp!= null && tmptmp.Name == node.Name) {
                            fnd = true;
                            break;
                        }
                    } while (tmptmp != null);
                    if (!fnd)
                        cnt = 0;
                }
                if (cnt != 0)
                    xpath.Append("[").Append(cnt.ToString()).Append("]");

                XmlNodeList children = node.SelectNodes("*");
                string value = children.Count > 0 ? string.Empty : node.InnerText;

                table.Rows.Add(new object[] { node.Name, xpath.ToString(), value });

               
                string bak = xpath.ToString();
                foreach (XmlNode child in children)
                {
                    StringBuilder xpath2 = new StringBuilder(bak);
                    if (child.NodeType == XmlNodeType.Element)
                    {
                        ProcessNode(child, table, xpath2);
                    }
                }
            }
            catch (Exception e)
            {
                Debug.WriteLine(e.ToString());
            }
        }

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Author Closing Comment

by:j420exe1
ID: 36580902
Awesome!  Thanks!
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