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Parsing xml response - Select specific node based on value of another node

I'm new to xml so I'm not sure if I worded the question correctly, but I will do my best to explain.
Basically, I'm trying to parse an xml response in C# such as the one below:
<Premium>
<TotalPremiumAmount>87</TotalPremiumAmount>
<StandardPremium>87</StandardPremium>
<OptionalPremium>0</OptionalPremium>
<StandardTax>0</StandardTax>
<OptionalTax>0</OptionalTax>
<ExtendedTax>0</ExtendedTax>
<ExtendedPremium>0</ExtendedPremium>
<PromotionalPremium>0</PromotionalPremium>
<FeesPremium>0</FeesPremium>
<FeesTax>0</FeesTax>
<StandardFeesPremium>0</StandardFeesPremium>
<OptionalFeesPremium>0</OptionalFeesPremium>
<Tax>0</Tax>
<StandardPremiumDistribution>
<Travelers>
<Traveler>
<TravelerPremium>42</TravelerPremium>
<TravelerTax>0</TravelerTax>
</Traveler>
<Traveler>
<TravelerPremium>45</TravelerPremium>
<TravelerTax>0</TravelerTax>
</Traveler>
</Travelers>
</StandardPremiumDistribution>
<PackagePremiumDistribution>
<Packages>
<Package>
<PackageID>20265</PackageID>
<PackageName />
<PackageTypeID>12</PackageTypeID>
<Premium>87</Premium>
<Fees>0</Fees>
<Tax>0</Tax>
<Travelers>
<Traveler>
<TravelerID>0</TravelerID>
<Premium>42</Premium>
<Tax>0</Tax>
</Traveler>
<Traveler>
<TravelerID>1</TravelerID>
<Premium>45</Premium>
<Tax>0</Tax>
</Traveler>
</Travelers>
</Package>
</Packages>
</PackagePremiumDistribution>
</Premium>
I would like to get the value of the (Traveler) Premium. In the case of only one traveler, I have been using an XMLDocument and the 'SelectSingleNode" function. For example I could do something like:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlResponse);
var premium = xmlDoc.SelectSingleNode("//TravelerPremium").InnerText;
But this wouldn't work when multiple travelers are returned under one plan. For example, I need the premium when TravelerID = 0. How would I go about doing this?
Thanks.

Using XmlDocument:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlResponse);
var premium = xmlDoc.SelectSingleNode("//Premium[../TravelerID = '0']")
You could also iterate through the nodes if multiple could match on this condition like so:
foreach(var premium in xmldoc.SelectNodes("//Premium[../TravelerID = '0']")
{
// do work on each premium node where TravelerID = 0
}
I'd encourage you to look into using LINQ to XML - it's generally easier to work with and will be more performant in most cases. You could even still use XPath expressions, but the following would work:
XDocument xdoc = XDocument.Load(xmlResponse);
var premium = (string)xdoc.Descendants("Traveler").Where(x => (string)x.Element("TravelerID") == "0").Element("Premium");

Assuming your xml looks like that, try something like this:
XmlDocument doc = new XmlDocument();
xmlDoc.Load(xmlResponse);
if (doc.HasChildNodes)
{
foreach (XmlNode node in doc.DocumentElement.ChildNodes)
if (node.Name == "StandardPremiumDistribution")
{
XmlNodeList xnList = node.SelectNodes("//Travelers");
double travelerPremium= xnList.Item(z).FirstChild.InnerText);
}}
Based on this, I think you're gonna do it.

Let's suppose you have a file called XMLFile1.xml with the XML you posted you can iterate through all your TravelerPremium with the following code:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("XMLFile1.xml");
XmlNodeList premiums = xmlDoc.SelectNodes("//TravelerPremium");
foreach(XmlNode node in premiums)
{
MessageBox.Show(node.FirstChild.InnerText);
}
You can also acces the other elements with similar code.

Can't parse XML data with C#

I have been trying to extract one value from a XML file, and then store it on the same file but in another node, I tried all the examples i've found on the net, read XPath Syntax documentation like hell and still can't get it to work.
I must take the <Documento ID="F60T33"> ID Value (which may vary) and copy it into <Reference URI="#F60T33">.
But I can't even do that if I can't manage to parse the lines, most of times node/variables/"", or I get an "object reference not established as object instance error".
Here's the code:
// Create a new XML document.
XmlDocument xmlDoc = new XmlDocument();
// Load an XML file into the XmlDocument object.
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load(pfile);
//TEST !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! PROBLEMA
XmlNodeList Documentos = xmlDoc.GetElementsByTagName("//Documento");
XmlNodeList DatosDocumento = ((XmlElement)Documentos[0]).GetElementsByTagName("ID");
foreach (XmlElement nodo in DatosDocumento)
{
int I = 0;
XmlNodeList ID = nodo.GetElementsByTagName("ID");
Console.WriteLine("Elemento nombre ... {0}}", ID[i].InnerText);
}
//
XmlNodeList nodes = xmlDoc.SelectNodes("EnvioDTE");
XmlNode nodesimple = xmlDoc.SelectSingleNode("EnvioDTE");
Console.WriteLine("Lista Nodos: " + nodes.Count);
Console.WriteLine("Nodo Simple: " + nodesimple.InnerText);
foreach (XmlNode node in nodes)
{
string id = node.Attributes["ID"].InnerText;
Console.WriteLine(id);
}
I am almost certain the problem is on the XPath Syntax, but I can't get it to work.
Sadly I can't use XDocument as im using .NET 3.5 for this task, I would really appreciate some help on this, by behand apologize my bad english
As the XML file is too big, I'll put it here on this URL
http://puu.sh/bVNDc/31e4da5a26.xml

If you can get your references right for using System.Linq.XDocument you can do:
string idValue = xDocument.XPathSelectElement("//EnvioDTE/SetDTE")
.Attributes().SingleOrDefault(a => a.Name == "ID").Value;

Reading Elements within a Namespace

I have an XML file that looks like:
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://www.someurl.com/somefile.xslt"?>
<AutoInsuranceClaim xmlns="http://www.someurl.com/schemas/AutoInsuranceClaim">
<Identification>
<BaseOwner>3</BaseOwner>
<BaseType>ABC123</BaseType>
<BaseTypeRef>471038341757</BaseTypeRef>
</Identification>
</AutoInsuranceClaim>
and I'm trying to read the Identification node. Here's my code:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(#"..\..\Data.xml");
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("ns", "http://www.someurl.com/schemas/AutoInsuranceClaim");
XmlNodeList nodeList = xmlDoc.SelectNodes(#"/ns:AutoInsuranceClaim/Identification", nsmgr);
Console.WriteLine("There are {0} nodes...", nodeList.Count);
I know I should get a least 1 value. My understanding of .NET XML parsing is that if you have a default namespace with no prefix, you have to create your own namespace. But this should have returned 1.
If not, what am I missing?

I might be grasping at straws here, but shouldn't you be namespacing both entities in your xpath expression?
XmlNodeList nodeList = xmlDoc.SelectNodes(#"/ns:AutoInsuranceClaim/ns:Identification", nsmgr);

XElement root = XElement.Load("Data.xml");
var identifications = root.Descendants()
.Where(x => x.Name.LocalName == "Identification")
.ToList()

The problem is that you're trying to find an Identification node without a namespace, but it will have defaulted to the same namespace as the parent due to the xmlns=... part. Try this:
var nodeList = xmlDoc.SelectNodes("/ns:AutoInsuranceClaim/ns:Identification",
nsmgr);
Having tried it myself, it printed a count of 1.
Personally I'd use LINQ to XML instead though, which makes namespace easier handling:
XDocument doc = XDocument.Load(#"..\..\Data.xml");
XNamespace ns = "http://www.someurl.com/schemas/AutoInsuranceClaim";
var nodes = doc.Root.Elements(ns + "Identification");

Select an XML node via XPath at an arbitrary depth

Having an XML document, I want to get the first node with a certain name, no matter in which nesting depth it is contained.
I tried several things without success:
var node1 = doc.SelectSingleNode(#"//Shortcut");
var node2 = doc.SelectSingleNode(#"/*/Shortcut");
var node3 = doc.SelectSingleNode(#"//*/Shortcut");
var node4 = doc.SelectSingleNode(#"*/Shortcut");
...
Each call results in a NULL node.
I think it should be some trivial XPath syntax. Can you help me?
(In case this matters: The XML document is an input file for a WiX project, so there could be some namespace issues involved?!?).
Edit
I also tried the following:
var nsm = new XmlNamespaceManager(doc.NameTable);
nsm.AddNamespace(string.Empty, #"http://schemas.microsoft.com/wix/2006/wi");
nsm.AddNamespace(#"ns", #"http://schemas.microsoft.com/wix/2006/wi");
together with:
var node1 = doc.SelectSingleNode(#"//Shortcut", nsm);
var node2 = doc.SelectSingleNode(#"/*/Shortcut", nsm);
var node3 = doc.SelectSingleNode(#"//*/Shortcut", nsm);
var node4 = doc.SelectSingleNode(#"*/Shortcut", nsm);
...
Leading to the same results.
Edit 2 - Solution
I found the solution:
var nsm = new XmlNamespaceManager(doc.NameTable);
nsm.AddNamespace(string.Empty, #"http://schemas.microsoft.com/wix/2006/wi");
nsm.AddNamespace(#"ns", #"http://schemas.microsoft.com/wix/2006/wi");
and then
var node1 = doc.SelectSingleNode(#"//ns:Shortcut", nsm);
This succeeded.

The XPath expression that selects exactly the wanted node (and nothing in addition) is:
(//x:Shortcut)[1]
So, using:
doc.SelectNodes("(//x:Shortcut)[1]", someNamespaceManager)
where
the prefix "x" is bound to the namespace "http://schemas.microsoft.com/wix/2006/wi"
in someNamespaceManager
This has an advantage over the proposed solution (to use SelectSingleNode()), because it can easily be adjusted to select the N-th wanted node in the XML document.
For example:
(//x:Shortcut)[3]
selects the 3rd (in document order) x:Shortcut element, and
(//x:Shortcut)[last()]
selects the last (in document order) x:Shortcut element in the XML document.

Why do not use XDocument?
XDocument doc = XDocument.Load("test.xml");
doc.Descendants("Shortcut").First();
IMO XDocument is faster and more readable than XPath.

I finally found the solution by myself:
var nsm = new XmlNamespaceManager(doc.NameTable);
nsm.AddNamespace(string.Empty, #"http://schemas.microsoft.com/wix/2006/wi");
nsm.AddNamespace(#"ns", #"http://schemas.microsoft.com/wix/2006/wi");
and then
var node1 = doc.SelectSingleNode(#"//ns:Shortcut", nsm);
This succeeded.

Maximum number of attributes a node has in a XML document

We are interested in finding maximum number of attributes a node has in a XML document. My code is below using C#:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(#"C:\ABC.xml");
XmlNode root = xmlDoc.DocumentElement;
int nodeAttrCount = 0;
foreach (XmlNode node in root)
if (nodeAttrCount < node.Attributes.Count)
nodeAttrCount = node.Attributes.Count;
We are interested is: do we have any thing better than this. Like any method or property which give us the same result or anyother option.

You can also use LINQ to XML:
XElement el = XElement.Load("MyXML.xml");
int maxAttr = el.DescendantNodesAndSelf().OfType<XElement>().Max(x => x.Attributes().Count());
The above code traverses all the xml nodes (it works with nested nodes too) and get the maximum number of attributes.
For .net 2.0:
XmlDocument doc = new XmlDocument();
doc.Load("MyXML.xml");
int max = 0;
foreach (XmlNode xmlNode in doc.SelectNodes("//*"))
if (max < node.Attributes.Count)
max = node.Attributes.Count;
This is basically the same as your solution;
the main difference is that it considers all nodes at every nesting level (using XPath navigation).

This is three lines of code for a fairly niche requirement. I wouldn't expect this to already exist in the .NET framework.
Your foreach loop looks fine. Are you sure you want to only look at the root elements, and not recurse inside the document?