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Parsing an XML File

Posted on 2011-09-20
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Last Modified: 2013-11-18
I need to get currency exchange rates from an RSS feed. I am having trouble (1) parsing the nodes and (2) getting the currency value.

I have successfully saved the xml file. The full file is attached :

The code section I am stuck with is:

 XmlNamespaceManager man = new XmlNamespaceManager(responseXML.NameTable);
                man.AddNamespace("rdf", "http://www.w3.org/1999/XSL/Transform");

                XmlNodeList xnList = responseXML.SelectNodes("rdf:RDF/item", man);
         
                foreach (XmlNode xn in xnList)
                {
                    if (xn["targetCurrency"].InnerText != "EUR")
                               //Get the value of the item :node"
                }

The xnList.Count = 0 which may indicate selectNodes list is not correct.

Please help

J
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:syn="http://purl.org/rss/1.0/modules/syndication/" xmlns:admin="http://webns.net/mvcb/" xmlns:feedburner="http://rssnamespace.org/feedburner/ext/1.0">
  <channel rdf:about="http://xurrency.com/aud/feed">
    <title>Xurrency.com | AUD</title>
    <link>http://xurrency.com/aud/feed</link>
    <description>Australian Dollar</description>
    <dc:language>en-us</dc:language>
    <dc:rights>Creative Commons</dc:rights>
    <dc:date>2011-09-20T17:06:43Z</dc:date>
    <dc:creator>Xurrency.com</dc:creator>
    <dc:subject>Currency Values</dc:subject>
  </channel>
  <item rdf:about="http://xurrency.com/eur">
    <title xml:lang="en"><![CDATA[1 AUD = 0.7516 EUR]]></title>
    <link>http://xurrency.com/eur</link>
    <description xml:lang="en"><![CDATA[1 AUD = 0.7516 EUR]]></description>
    <dc:date>Tue Sep 20 18:03:00 UTC 2011</dc:date>
    <dc:language>en</dc:language>
    <dc:creator>Xurrency.com</dc:creator>
    <dc:simpleTitle>1 AUD = 0.7516 EUR</dc:simpleTitle>
    <dc:baseCurrency>AUD</dc:baseCurrency>
    <dc:targetCurrency>EUR</dc:targetCurrency>
    <dc:value frequency="daily" decimal="4">0.7516</dc:value>
  </item>
  <item rdf:about="http://xurrency.com/usd">
    <title xml:lang="en"><![CDATA[1 AUD = 1.0279 USD]]></title>
    <link>http://xurrency.com/usd</link>
    <description xml:lang="en"><![CDATA[1 AUD = 1.0279 USD]]></description>
    <dc:date>Tue Sep 20 18:03:00 UTC 2011</dc:date>
    <dc:language>en</dc:language>
    <dc:creator>Xurrency.com</dc:creator>
    <dc:simpleTitle>1 AUD = 1.0279 USD</dc:simpleTitle>
    <dc:baseCurrency>AUD</dc:baseCurrency>
    <dc:targetCurrency>USD</dc:targetCurrency>
    <dc:value frequency="daily" decimal="4">1.0279</dc:value>
  </item>


and so on

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20110921-ExchangeRates.xml
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Comment
Question by:JenebyM
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  • 3
6 Comments
 
LVL 7

Accepted Solution

by:
dimaj earned 500 total points
ID: 36568982
I wrote a quick article on how to parse/modify xml using linq... see if it'll help you: http://blog.dimaj.net/2011/02/howto-update-xml-file-using-linq/
0
 

Author Comment

by:JenebyM
ID: 36569148
I need to identify what is wrong with parsing this specific file.

The node names appear peculiar and are not being parsed judging by the node.count = 0.

Using LINQ does not solve that problem and I will get nowhere by simply changing to using LInqXML if I cant get past this.

Please have a look at the XML file itself and see whether you can determine what Is the issue.

Many thanks
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LVL 7

Assisted Solution

by:dimaj
dimaj earned 500 total points
ID: 36569363
try this:
      private void TestSomething ()
      {
         string fname = @"C:\temp\20110921-ExchangeRates.xml";
         XDocument myDoc = XDocument.Load(fname);

         IEnumerable<XElement> enumElements = myDoc.Root.Elements();
         IEnumerator enumer = enumElements.GetEnumerator();
         while (enumer.MoveNext() != null)
         {
            XElement curItem = (XElement)enumer.Current;
            var item = (from a in curItem.Attributes()
                             where !a.Value.Contains("EUR")
                             select a).ToList();
            if (item.Count > 0)
            {
               // get the value

            }
         }
      }

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Author Comment

by:JenebyM
ID: 36570075
Not really what I am looking for.

My problem is that i need to work with rdf and I was unable to read the xml file.

I have found what was missing:

1. I did not include all the required namespace reference for the RSS.
i.e
                man.AddNamespace("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
                man.AddNamespace("slash", "http://purl.org/rss/1.0/modules/slash/");
                man.AddNamespace("taxo", "http://purl.org/rss/1.0/modules/taxonomy/");
                man.AddNamespace("dc", "http://purl.org/dc/elements/1.1/");
                man.AddNamespace("syn", "http://purl.org/rss/1.0/modules/syndication/");
                man.AddNamespace("admin", "http://webns.net/mvcb/");
                man.AddNamespace("feedburner", "http://rssnamespace.org/feedburner/ext/1.0");
                man.AddNamespace("rss", "http://purl.org/rss/1.0/");


2. The nodes list is obtained by:

 XmlNodeList xnList = responseXML.SelectNodes("rdf:RDF//rss:item", man);

These two changes have given me the results I need.

Will award partial marks for the answer.

Regards

0
 

Author Closing Comment

by:JenebyM
ID: 36570086
research further and found solution I was looking for elsewhere
0
 
LVL 7

Expert Comment

by:dimaj
ID: 36570088
Glad you've got it resolved!

dimaj
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