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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.

Get xml node using c#

I have a request that returns a large xml file. I have the file in a XmlDocument type in my application. From that Doc how can I read an element like this:
<gphoto:videostatus>final</gphoto:videostatus>
I would like to pull that value final from that element. Also If i have multiple elements as well, can I pull that into a list? thanks for any advice.

If you already have an XmlDocument then you can use the function GetElementsByTagName() to create an XmlNodeList that can be accessed similar to an array.
http://msdn.microsoft.com/en-us/library/dc0c9ekk.aspx
//Create the XmlDocument.
XmlDocument doc = new XmlDocument();
doc.Load("books.xml");
//Display all the book titles.
XmlNodeList elemList = doc.GetElementsByTagName("title");
for (int i=0; i < elemList.Count; i++)
{
Console.WriteLine(elemList[i].InnerXml);
}

You can select nodes using XPath and SelectSingleNode SelectNodes. Look at http://www.codeproject.com/Articles/9494/Manipulate-XML-data-with-XPath-and-XmlDocument-C for examples. Then you can use for example InnerText to get final. Maybe you need to work with namespaces (gphoto). The //videostatus would select all videostatus elements

You can try using LINQ
XNamespace ns = XNamespace.Get(""); //use the xmnls namespace here
XElement element = XElement.Load(""); // xml file path
var result = element.Descendants(ns + "videostatus")
.Select(o =>o.Value).ToList();
foreach(var values in value)
{
}
Thanks
Deepu

How to get the value from XML?

I'm making a small tool for checking the material number from the XML file.
I know this quite easy for you experts and I would like to ask for your help on this to get me started on this. On my machine I have .NET 2.0 framework I guess, and VS C# Express 2005 installed.
I have an XML that contains data of a material. It is located at my local drive. I am able now to browse the XML file and save the file in a string variable. Well, that's what I have done so far..
if(folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
string[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath, "Product.xml");
string prodFile = files[0];
...
...
Suppose this is the structure of the XML:
<Record>
<Product>
<Material_Number>20209485</Material_Number>
<Product_Type>Type1</Product_Type>
...
...
</Product>
</Record>
How can I get the material number value?

You can use the XmlDocument class for loading your XML File into a DOM.
MSDN - This class implements the W3C Document Object Model (DOM) Level 1 Core and the Core DOM Level 2. The DOM is an in-memory (cache) tree representation of an XML document and enables the navigation and editing of this document. Because XmlDocument implements the IXPathNavigable interface it can also be used as the source document for the XslTransform class.
Sample
There are many ways to read your value. I really encourage you to read Working with Xml DOM
XmlNodeList list = xml.GetElementsByTagName("Product");
XmlAttributeCollection attr = list[0].Attributes;
string materialNumber = list[0].ChildNodes[0].InnerText;
or
XmlNodeList list = xml.GetElementsByTagName("Material_Number");
string materialNumber = list[0].InnerText;
More Information
MSDN - XmlDocument Class
Working with Xml DOM

You could also use XPathNavigator and XPathExpression with XmlDocument.
var xmlDoc = new XmlDocument();
xmlDoc.Load("Product.xml") //or xmlDoc.LoadXml(xmlString);
var xmlNav = xmlDoc.CreateNavigator();
string materialNum;
var iterator = xmlNav.Select("/Record/Product/Material_Number");
if (iterator.MoveNext() && iterator.Current != null)
materialNum = iterator.Current.Value;
If you use .Net 3.0+ you could use System.Xml.Linq.XDocument.
var xdoc = XDocument.Load("Product.xml"); //or var xdoc = XDocument.Parse(xmlString);
var materialNum = xdoc.Root.Element("Product").Element("Material_Number").Value;

I was able to find a solution. Not so elegant though...
XmlDocument xmlDoc= new XmlDocument();
xmlDoc.Load(#"C:\Product.xml");
XmlNodeList a = xmlDoc.GetElementsByTagName("Material_Number");
string materialNumber = a[0].InnerText;

How do I parse this xml?

I need to parse the following xml code in c# using system.xml. I need a list of strings containing the content of the tags User.
<Configuration>
....
<DebugUsersMail>
<User>bob#example.com</User>
<User>lenny#example.com</User>
</DebugUsersMail>
...
</Configuration>

If you can use Linq something like this is nice and simple
XDocument xmlDoc = XDocument.Load("C:\\your_xml_file.xml");
List<string> users = xmlDoc.Descendants("User").Select(xElem => (string)xElem).ToList();
You'll need to include a reference to System.Xml.Linq in your using statements to use the XDocument object.
This does however assume that there are no other User elements in the xml file that you don't want included in the list.
If you want to be more specific you could do this
List<string> users = xmlDoc.Descendants("DebugUsersMail")
.Descendants("User").Select(xElem => (string)xElem).ToList();

I found a solution:
List<string> returnList = new List<string>();
XmlNodeList node = xmlDocument.GetElementsByTagName("DebugUsersMail");
XmlNodeList childNodes = node[0].ChildNodes;
for(int i = 0; i < childNodes.Count; i++)
{
returnList.Add(childNodes[i].InnerText);
}
return returnList;

There are tons of ways to do it in C#. You can use:
XmlDocument andthen XPath and XQuery
XDocument and Linq
XmlTextReader/SAX
Regular expressions
Deserialise the XML to objects
The route to take depends a lot of what the rest of XML looks like.

How to read XML attributes in C#?

I have several XML files that I wish to read attributes from. My main objective is to apply syntax highlighting to rich text box.
For example in one of my XML docs I have: <Keyword name="using">[..] All the files have the same element: Keyword.
So, how can I get the value for the attribute name and put them in a collection of strings for each XML file.
I am using Visual C# 2008.

The other answers will do the job - but the syntax highlighting thingy and the several xml files you say you have makes me thinks you need something faster, why not use a lean and mean XmlReader?
private string[] getNames(string fileName)
{
XmlReader xmlReader = XmlReader.Create(fileName);
List<string> names = new List<string>();
while (xmlReader.Read())
{
//keep reading until we see your element
if (xmlReader.Name.Equals("Keyword") && (xmlReader.NodeType == XmlNodeType.Element))
{
// get attribute from the Xml element here
string name = xmlReader.GetAttribute("name");
// --> now **add to collection** - or whatever
names.Add(name);
}
}
return names.ToArray();
}
Another good option would be the XPathNavigator class - which is faster than XmlDoc and you can use XPath.
Also I would suggest to go with this approach only IFF after you try with the straightforward options you're not happy with performance.

You could use XPath to get all the elements, then a LINQ query to get the values on all the name atttributes you find:
XDocument doc = yourDocument;
var nodes = from element in doc.XPathSelectElements("//Keyword")
let att = element.Attribute("name")
where att != null
select att.Value;
string[] names = nodes.ToArray();
The //Keyword XPath expression means, "all elements in the document, named "Keyword".
Edit: Just saw that you only want elements named Keyword. Updated the code sample.

Like others, I would suggest using LINQ to XML - but I don't think there's much need to use XPath here. Here's a simple method to return all the keyword names within a file:
static IEnumerable<string> GetKeywordNames(string file)
{
return XDocument.Load(file)
.Descendants("Keyword")
.Attributes("name")
.Select(attr => attr.Value);
}
Nice and declarative :)
Note that if you're going to want to use the result more than once, you should call ToList() or ToArray() on it, otherwise it'll reload the file each time. Of course you could change the method to return List<string> or string[] by -adding the relevant call to the end of the chain of method calls, e.g.
static List<string> GetKeywordNames(string file)
{
return XDocument.Load(file)
.Descendants("Keyword")
.Attributes("name")
.Select(attr => attr.Value)
.ToList();
}
Also note that this just gives you the names - I would have expected you to want the other details of the elements, in which case you'd probably want something slightly different. If it turns out you need more, please let us know.

You could use LINQ to XML.
Example:
var xmlFile = XDocument.Load(someFile);
var query = from item in xmlFile.Descendants("childobject")
where !String.IsNullOrEmpty(item.Attribute("using")
select new
{
AttributeValue = item.Attribute("using").Value
};

You'll likely want to use XPath. //Keyword/#name should get you all of the keyword names.
Here's a good introduction: .Net and XML XPath Queries

**<Countries>
<Country name ="ANDORRA">
<state>Andorra (general)</state>
<state>Andorra</state>
</Country>
<Country name ="United Arab Emirates">
<state>Abu Z¸aby</state>
<state>Umm al Qaywayn</state>
</Country>**
public void datass(string file)
{
string file = HttpContext.Current.Server.MapPath("~/App_Data/CS.xml");
XmlDocument doc = new XmlDocument();
if (System.IO.File.Exists(file))
{
//Load the XML File
doc.Load(file);
}
//Get the root element
XmlElement root = doc.DocumentElement;
XmlNodeList subroot = root.SelectNodes("Country");
for (int i = 0; i < subroot.Count; i++)
{
XmlNode elem = subroot.Item(i);
string attrVal = elem.Attributes["name"].Value;
Response.Write(attrVal);
XmlNodeList sub = elem.SelectNodes("state");
for (int j = 0; j < sub.Count; j++)
{
XmlNode elem1 = sub.Item(j);
Response.Write(elem1.InnerText);
}
}
}