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Linq to XML elements

Hi I try to read an xml file with LINQ.
The name of the file is:categorizedBooks.xml
and the content of the file looks like this:
<category name=".NET">
<books>
<book>CLR via C#</book>
<book>Essential .NET</book>
</books>
</category>
The code for reading the file looks like this:
XElement rootss = XElement.Load(#"D:/categorizedBooks.xml");
XElement dotNetCategoryss = rootss.Element("category");
XAttribute namehallo = dotNetCategoryss.Attribute("name");
XElement booksss = dotNetCategoryss.Element("books");
IEnumerable<XElement> bookElements = booksss.Elements("book");
Console.WriteLine((string)dotNetCategoryss);
foreach (XElement bookElement in bookElements)
{
Console.WriteLine(" - " + (string)bookElement);
}
But i get null on this line:
XAttribute namehallo = dotNetCategoryss.Attribute("name");
So how to fix this , so that it not will be null?
Thank you

Your doc root is the category element - try:
XAttribute namehallo = rootss.Attribute("name");
Console.WriteLine(namehallo.Value);
You'll have to change your other XElement references similarly

instead of XElement.Load use XDocument.Load or XDocument.Parse
var xml = #"
<category name='.NET'>
<books>
<book>CLR via C#</book>
<book>Essential .NET</book>
</books>
</category>";
var document = XDocument.Parse(xml);
// returns: .NET
var category = document
.Element("category")
.Attributes("name")
.Select(p => p.Value);
// returns: CLR via C#, Essential .NET
var books = document
.Descendants("book")
.Select(p => p.Value);

Finding Correct Xpath C# [duplicate]

I'm having this XML document with namespaces and I want to extract some nodes using XPath.
Here's the document:
<ArrayOfAnyType xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/">
<anyType xsi:type="Document">
<Id>5</Id>
<Title>T1</Title>
</anyType>
<anyType xsi:type="Document">
<Id>15</Id>
<Title>T15</Title>
</anyType>
</ArrayOfAnyType>
What's the XPath expression going to be if I want to extract all "anyType" elements with xsi:type="Document"?
I've tried this:
//anyType[#xsi:type="Document"]
and it doesn't work:

If you are using C# then you need to specify the namespace for the "anyType" element in your XPath:
var xml = new XmlDocument();
xml.LoadXml( "your xml" );
var names = new XmlNamespaceManager( xml.NameTable );
names.AddNamespace( "xsi", "http://www.w3.org/2001/XMLSchema-instance" );
names.AddNamespace( "a", "http://tempuri.org/" );
var nodes = xml.SelectNodes( "//a:anyType[#xsi:type='Document']", names );

I think that
//anyType[namespace-uri() = "http://www.w3.org/2001/XMLSchema-instance"][local-name() = "type"]
Will do what you want.

This way you don't need to specify namespace:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml("your xml");
XmlNode node = xmlDoc.SelectSingleNode("/*[local-name() = 'anyType']");
XmlNode nodeToImport = xmlDoc2.ImportNode(node, true);
xmlDoc2.AppendChild(nodeToImport);

Had nearly the same problem, I forgot to add the correct namespace for xsi:type
(http://www.w3.org/2001/XMLSchema-instance) was using http://www.w3.org/2001/XMLSchema
and I did never get any result - now it is working the following way:
<xsl:value-of select="/item1/item2/item3/#xsi:type"></xsl:value-of>

Trying to parse xml in Windows Phone 7.8 app but getting null value?

I am trying to parse a xml that I got as response to webservice response the xml is shown below
<GeneralSearchResponse>
<serverDetail></serverDetail>
<exceptions exceptionCount="1"></exceptions>
<clientTracking height="19" type="logo" width="106"></clientTracking>
<searchHistory></searchHistory>
<categories matchedCategoryCount="1" returnedCategoryCount="1">
<category id="0">
<name>bart</name>
<categoryURL>http://www.shopping.com/bart/products?oq=bart&linkin_id=7000610
</categoryURL>
<items matchedItemCount="1045" pageNumber="1" returnedItemCount="5">
<product id="130506037"></product>
<product id="104483377"></product>
<offer featured="false" id="tp-VCdOoO1RL6xICeRONqg==" smartBuy="false" used="false"></offer>
<offer featured="false" id="12evWWi57lddzFufngUWsg==" smartBuy="false" used="false"></offer>
<product id="96754577"></product>
</items>
<attributes matchedAttributeCount="5" returnedAttributeCount="5"></attributes>
<contentType>hybrid</contentType>
</category>
<intActualCategoryCount>4</intActualCategoryCount>
</categories>
<relatedTerms></relatedTerms>
</GeneralSearchResponse>
But when I am trying to parse using following code I am not able to get any descend or any node
XDocument xDoc = new XDocument();
xDoc = XDocument.Parse(data);
var xEle = xDoc.Root.Descendants("categories");
But xEle is not having any categories. Please let me know what is the issue??

Your XML has a default namespace - so the elements in it are in that namespace. The methods which find elements in LINQ to XML are namespace sensitive. You want:
XNamespace ns = "urn:types.partner.api.shopping.com";
XDocument xDoc = new XDocument();
xDoc = XDocument.Parse(data);
var xEle = xDoc.Root.Descendants(ns + "categories");

Adding an element to this xml structure

<root>
<element1>innertext</element1>
<element2>innertext</element2>
<element3>
<child1>innertext</child1>
</element3>
</root>
I have an xml structure shown above.
I would like to "append" the xml file (it is already created) to add another "child" inside element3>, so that it will look like this:
<root>
<element1>innertext</element1>
<element2>innertext</element2>
<element3>
<child1>innertext</child1>
<child2>innertext</child2>
</element3>
</root>
Linq to xml and/or Xpath would be great
EDIT:
I have tried doing this:
XElement doc = XElement.Load(mainDirectory);
XElement newElem = doc.Elements("element3").First();
newElem.Add(new XElement("child2", "child2innertext"));
doc.Add(newElem);
doc.Save(mainDirectory);

XmlDocument xDoc = new XmlDocument();
xDoc.Load("filename.xml");
foreach (XmlNode xNode in xDoc.SelectNodes("/root/element3"))
{
XmlElement newElement = xDoc.CreateElement("Child2");
xNode.AppendChild(newElement);
xNode.InnerText = "myInnerText";
}

With XDocument you can achieve this as:
string xml = "<root><element1>innertext</element1><element2>innertext</element2><element3><child1>innertext</child1></element3></root>";
var doc = XDocument.Parse(xml); //use XDocument.Load("filepath"); in case if your xml is in a file.
var el3 = doc.Descendants("element3").FirstOrDefault();
el3.Add(new XElement("child2", "innertext"));

Please, try this LINQPAD example
void Main()
{
var xml =
#"<root>
<element1>innertext</element1>
<element2>innertext</element2>
<element3>
<child1>innertext</child1>
</element3>
</root>";
var doc = XDocument.Parse(xml);
doc.Root.Element("element3")
.Add(new XElement("child2", "innertext"));
doc.Dump();
}

How to get the value of an XML attribute?

I have a XML file:
<SourceMessage xmlns="test.test">
<updated>2011</updated>
<title type="p1"/>
<title type="p2"/>
<title type="p3"/>
<entry>
</entry>
</SourceMessage>
How could I use LINQ to get the <type> attribute of the <title> element, i.e. "p1", "p2" and "p3"?

Use XDocument.Load or XDocument.Parse to load the XML data into an XDocument. Then, using LINQ, you can get the type for each <title> element under the document root as follows:
XNamespace test = "test.test";
XDocument doc = XDocument.Load(file);
// - or -
XDocument doc = XDocument.Parse("<SourceMessage ...");
IEnumerable<string> query = from title in doc.Root.Elements(test + "title")
select (string)title.Attribute("type");
foreach (string item in query)
{
Console.WriteLine(item);
}
Output:
p1
p2
p3

var xElement XElement.Parse(xmlString);
var result = xElement.Descendants("title")
.Select(e => e.Attribute("type").Value);

XDocument xml = XDocument.Parse (#"<SourceMessage xmlns="test.test">
<updated>2011</updated>
<title type="p1"/>
<title type="p2"/>
<title type="p3"/>
<entry>
</entry>
</SourceMessage>");
foreach (var t in xml.Root.Descendants("title"))
Console.Write(t.Attribute("type").Value);