Get specific values from Xml

Question

I don't how to extract the values from XML document, and am looking for some help as I'm new to C#

I am using XmlDocument and then XmlNodeList for fetching the particular XML document

Here is my code

XmlNodeList XMLList = doc.SelectNodes("/response/result/doc");

And my XML looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<response>
<result>
  <doc>
    <long name="LoadID">494</long>
    <long name="EventID">5557</long>
    <str name="XMLData"><TransactionDate>2014-05-28T14:17:31.2186777-06:00</TransactionDate><SubType>tblQM2222Components</SubType><IntegerValue title="ComponentID">11111</IntegerValue></str></doc>
  <doc>
    <long name="LoadID">774</long>
    <long name="EventID">5558</long>
    <str name="XMLData"><TransactionDate>2014-05-28T14:17:31.2186777-06:00</TransactionDate><SubType>tblQM2222Components</SubType><IntegerValue title="ComponentID">11111</IntegerValue></str></doc>
</result>
</response>

In this i have to fetch every the XMLData data that is under every doc tag and i have to fetch last doc tag EventID .

Answer 1

var xml = XDocument.Parse(xmlString);

var docs = xml.Root.Elements("doc");

var lastDocEventID = docs.Last()
                         .Elements("long")
                         .First(l => (string)l.Attribute("name") == "EventID")
                         .Value;

Console.WriteLine ("Last doc EventId: " +lastDocEventID);

foreach (var doc in docs)
{
    Console.WriteLine (doc.Element("str").Element("TransactionDate").Value);
}

prints:

Last doc EventId: 5558
2014-05-28T14:17:31.2186777-06:00
2014-05-28T14:17:31.2186777-06:00

Answer 2

You can use two XPath expressions to select the nodes you want. To answer each part of your question in turn:

To select all of the XMLData nodes:

XmlNodeList XMLList 
      = doc.SelectNodes("/response/result/doc/str[@name='XMLData']");

To select the last EventId:

XmlNode lastEventIdNode = 
   doc.SelectSingleNode("/response/result/doc[position() = 
                          last()]/long[@name='EventID']");

If not all doc nodes are guaranteed to have an event id child node, then you can simply:

XmlNodeList eventIdNodes = 
    doc.SelectNodes("/response/result/doc[long[@name='EventID']]");
XmlNode lastNode = eventIdNodes[eventIdNodes.Count - 1];

That should give you what you've asked for.

Update;

If you want the XML data inside each strXml element, you can use the InnerXml property:

XmlNodeList xmlList 
      = doc.SelectNodes("/response/result/doc/str[@name='XMLData']");
foreach(XmlNode xmlStrNode in xmlList)
{
    string xmlInner = xmlStrNode.InnerXml;
}

Answer 3

There's one result tag short in your xml.

Try using this. It's cleaner too imho

XmlNodeList docs = doc.SelectSingleNode("response").SelectSingleNode("result").SelectNodes("doc");

Then you can use a combination of SelectSingleNode , InnerText , Value to get the data from each XmlNode in your list.

For example if you want the EventID from the first doc tag:

int eventID = int.Parse(docs[0].SelectSingleNode("long[@name='EventID']").InnerText);