Develop Reference

Extract data from xml string

Let's say I have an xml string:
<?xml version="1.0" encoding="UTF-8"?>
<Return version="1.0">
<File>1</File>
<URL>2</URL>
<SourceUUID>1191CF90-5A32-4D29-9F90-24B2EXXXXXX0</SourceUUID>
</Return>
and I want to extract the value of SourceUUID, how?
I tried:
XDocument doc = XDocument.Parse(xmlString);
foreach (XElement element in doc.Descendants("SourceUUID"))
{
Console.WriteLine(element);
}

If all you want is the content of the SourceUUID element, and there's only going to be 1 in the XML, you can do this:
XDocument doc = XDocument.Parse(xmlString);
var value = doc.Descendants("SourceUUID").SingleOrDefault()?.Value;
If there are going to be more than one, you can do this:
var values = doc.Descendants("SourceUUID").Select(x => x.Value);
This gives you an enumerable of strings that are the text values of the elements.

How to get enclosure url with XElement C# Console

I read multiple feed from many sources with C# Console, and i have this code where i load XML From sources:
XmlDocument doc = new XmlDocument();
doc.Load(sourceURLX);
XElement xdoc = XElement.Load(sourceURLX);
How to get enclosure url and show as variable?

If I understand your question correctly (I'm making a big assumption here) - you want to select an attribute from the root (or 'enclosing') tag, named 'url'?
You can make use of XPath queries here. Consider the following XML:
<?xml version="1.0" encoding="utf-8"?>
<root url='google.com'>
<inner />
</root>
You could use the following code to retrieve 'google.com':
String query = "/root[1]/#url";
XmlDocument doc = new XmlDocument();
doc.Load(sourceURLX);
String value = doc.SelectSingleNode(query).InnerText;
Further information about XPath syntax can be found here.
Edit: As you stated in your comment, you are working with the following XML:
<item>
<description>
</description>
<enclosure url="blablabla.com/img.jpg" />
</item>
Therefore, you can retrieve the url using the following XPath query:
/item[1]/enclosure[1]/#url

With xml like below
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
<channel>
<title>title</title>
<link>https://www.link.com</link>
<description>description</description>
<item>
<title>RSS</title>
<link>https://www.link.com/xml/xml_rss.asp</link>
<description>description</description>
<enclosure url="https://www.link.com/media/test.wmv"
length="10000"
type="video/wmv"/>
</item>
</channel>
</rss>
You will get url by reading attribute
var document = XDocument.Load(sourceURLX);
var url = document.Root
.Element("channel")
.Element("item")
.Element("enclosure")
.Attribute("url")
.Value;
To get multiple urls
var urls = document.Descendants("item")
.Select(item => item.Element("enclosure").Attribute("url").Value)
.ToList();
Using foreach loop
foreach (var item in document.Descendants("item"))
{
var title = item.Element("title").Value;
var link = item.Element("link").Value;
var description = item.Element("description").Value;
var url = item.Element("enclosure").Attribute("url").Value;
// save values to database
}

how to get child element attribute value from xml to linq in c#

<?xml version="1.0" encoding="utf-8" ?>
<Response success="true">
<data>
<class name="getId" classValue=" this is a class value"></class>
</data>
</Response>
string strPath = #"C:\Users\Fale\Documents\practice\xpathNavigator\xpathNavigator\1.xml";
XDocument Xdco = XDocument.Load(strPath);
var list = from i in Xdco.Root.Descendants("Response")
where i.Attribute("success").Value == "true"
select i.Element("data").Element("class").Attribute("classValue").Value;
How to check response is true and then to get attribute value using linq c#?

var list = from i in Xdco.Descendants("Response")
where i.Attribute("success").Value == "true"
select i.Element("data").Element("class").Attribute("classValue").V‌​alue;

Reading data from XML with attributes

I have an XML file which is like below:
<CPageDataXML xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<control id="busRowOAppr2EIDLookUpUserControl" controltype="business">
<field controlvaluetype="single" key="busRowOAppr2EIDLookUpUserControl_txtEID">
<valuefield value="709227">E8 - John Doe</valuefield>
</field>
<field controlvaluetype="hidden_single" key="busRowOAppr2EIDLookUpUserControl_txtEID_Email">
<valuefield value="_JohnDoe#Wonder.com">emailid</valuefield>
</field>
</control>
<control id="busDelegationFromDate123" controltype="business">
<field controlvaluetype="single" key="txtCalanderDateWithImage_UserControl">
<valuefield value="" />
</field>
</control>
</CPageDataXML>
I want to read the value of the valuefield where control id="busRowOAppr2EIDLookUpUserControl"
The C# code is:
This is the code for loading the XML:
XmlDocument xPagedata=new XmlDocument();
XmlNode xnodePagedata = null;
xPagedata.LoadXml(strPageData);
This is the code for SelectSingleNode:
string a = xnodePagedata.SelectSingleNode(//Control[#id='busRowOAppr2EIDLookUpUserControl']).Attributes["Value"].Value;
I have tried to use SelectSingleNode(string) but that is giving me a null reference exception. Kindly suggest how should I go about this one. I am an absolute beginer on XML.

One possible way using the same approach :
string a =
xnodePagedata.SelectSingleNode("//control[#id='busRowOAppr2EIDLookUpUserControl']/field/valuefield/#value")
.Value;
UPDATE :
In case there are multiple <valuefield> in one <control> and you want all values, use SelectNodes() for example :
var values =
xPagedata.SelectNodes("//control[#id='busRowOAppr2EIDLookUpUserControl']/field/valuefield/#value");
foreach (XmlNode value in values)
{
Console.WriteLine(value.Value);
}

You can use XDocument : use Descendants("control") to get all controls then filter them using the Where clause then use SelectMany to get a flattened collection of values of valuefield.
XDocument doc = XDocument.Load(filepath);
var result = doc.Descendants("control")
.Where(i => (string)i.Attribute("id") == "busRowOAppr2EIDLookUpUserControl")
.SelectMany(i => i.Descendants("valuefield")
.Select(j => j.Attribute("value")))
.ToList();
And this is the result:
result Count = 2
[0] {value="709227"}
[1] {value="_JohnDoe#Wonder.com"}

xml XPathSelectElements => to string type

I have the following XML structure:
<?xml version="1.0" encoding="utf-8"?>
<xml>
<root>
<Item>
<taxids>
<string>330</string>
<string>374</string>
<string>723</string>
<string>1087</string>
<string>1118</string>
<string>1121</string>
</taxids>
</Item>
</root>
</xml>
I need to get all the string nodes from the xml file to a string variable, like this:
var query = from ip in doc.XPathSelectElements("xml/root/Item")
where ip.XPathSelectElement("taxid").Value == "723"
select ip.XPathSelectElements("taxids").ToString();
But I am getting the following in one row of the variable query:
"System.Xml.XPath.XPathEvaluator+<EvaluateIterator>d__0`1[System.Xml.Linq.XElement]"
I want to get a string like this:
<taxids><string>330</string><string>374</string><string>723</string><string>1087</string><string>1118</string><string>1121</string></taxids>
Is this possible?
Thanks!

I would suggest you something like:
var values = from ids in doc.XPathSelectElements("/xml/root/Item/taxids")
from id in ids.XPathSelectElements("string")
where id.Value.Contains("723")
select ids.ToString();
var result = string.Join("", values);
The value variable will contain all the taxids, which have at least one string child with value 723.
Another variant, which doesn't use XPath for the children checking:
var values = from ids in doc.XPathSelectElements("/xml/root/Item/taxids")
from id in ids.Elements("string")
where id.Value.Contains("723")
select ids.ToString();
var result = string.Join("\n", values);

var doc = XDocument.Parse(#"<?xml version=""1.0"" encoding=""utf-8""?>
<xml>
<root>
<Item>
<taxids>
<string>330</string>
<string>374</string>
<string>723</string>
<string>1087</string>
<string>1118</string>
<string>1121</string>
</taxids>
</Item>
</root>
</xml>");
var query = doc.XPathSelectElement("xml/root/Item/taxids");
Console.WriteLine(query);