Develop Reference

Unable to parse xml string using Xdocument and Linq

I would like to parse the below xml using XDocument in Linq.
<?xml version="1.0" encoding="UTF-8"?>
<string xmlns="http://tempuri.org/">
<Sources>
<Item>
<Id>1</Id>
<Name>John</Name>
</Item>
<Item>
<Id>2</Id>
<Name>Max</Name>
</Item>
<Item>
<Id>3</Id>
<Name>Ricky</Name>
</Item>
</Sources>
</string>
My parsing code is :
var xDoc = XDocument.Parse(xmlString);
var xElements = xDoc.Element("Sources")?.Elements("Item");
if (xElements != null)
foreach (var source in xElements)
{
Console.Write(source);
}
xElements is always null. I tried using namespace as well, it did not work. How can I resolve this issue?

Try below code:
string stringXml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><string xmlns=\"http://tempuri.org/\"><Sources><Item><Id>1</Id><Name>John</Name></Item><Item><Id>2</Id><Name>Max</Name></Item><Item><Id>3</Id><Name>Ricky</Name></Item></Sources></string>";
XDocument xDoc = XDocument.Parse(stringXml);
var items = xDoc.Descendants("{http://tempuri.org/}Sources")?.Descendants("{http://tempuri.org/}Item").ToList();
I tested it and it correctly shows that items has 3 lements :) Maybe you used namespaces differently (it's enough to inspect xDoc objct in object browser and see its namespace).

You need to concatenate the namespace and can directly use Descendants method to fetch all Item nodes like:
XNamespace ns ="http://tempuri.org/";
var xDoc = XDocument.Parse(xmlString);
var xElements = xDoc.Descendants(ns + "Item");
foreach (var source in xElements)
{
Console.Write(source);
}
This prints on Console:
<Item xmlns="http://tempuri.org/">
<Id>1</Id>
<Name>John</Name>
</Item><Item xmlns="http://tempuri.org/">
<Id>2</Id>
<Name>Max</Name>
</Item><Item xmlns="http://tempuri.org/">
<Id>3</Id>
<Name>Ricky</Name>
</Item>
See the working DEMO Fiddle

How do I edit the value of a specific node in XML when there are multiple nodes with the same name?

I am trying to edit a specific node in an XML document. I have the following XML data:
<Items xmlns="http://foo.com/blah/blah">
<Item>
<Format>1</Format>
<Name>Edit this one</Name>
<MetaDataDictionary>
<MetaData>
<Name>Do not edit this one</Name>
<Value>0</Value>
</MetaData>
</MetaDataDictionary>
</Item>
<Item>
<Format>1</Format>
<Name>Edit this one</Name>
<MetaDataDictionary>
<MetaData>
<Name>Do not edit this one</Name>
<Value>0</Value>
</MetaData>
</MetaDataDictionary>
</Item>
</Items>
I want to append a number to each Item/Name node content but not to the Metadata/Name nodes, save the file off as test_n.xml and repeat n number of times.
The code I'm using seems to get me what I want for the Item/Name node and saved the file(s) correctly but it also updates the Metadata/Name nodes and I do not want that value to be updated. I understand the problem is in the navigator.Select call but I just don't know how to update one and skip the other.
XmlDocument doc = new XmlDocument();
doc.Load("test.xml");
XPathNavigator navigator = doc.CreateNavigator();
XmlNamespaceManager manager = new XmlNamespaceManager(navigator.NameTable);
manager.AddNamespace("at", "http://foo.com/blah/blah");
for (int i = 0; i < 10; i++)
{
foreach (XPathNavigator nav in navigator.Select("//at:Name", manager))
{
var currValue = nav.Value;
nav.SetValue(currValue + " " + i);
}
doc.Save("test_" + i + ".xml");
}
In the end I'd like it to be:
<Items xmlns="http://foo.com/blah/blah">
<Item>
<Format>1</Format>
<Name>Edit this one 0</Name>
<MetaDataDictionary>
<MetaData>
<Name>Do not edit this one</Name>
<Value>0</Value>
</MetaData>
</MetaDataDictionary>
</Item>
<Item>
<Format>1</Format>
<Name>Edit this one 0</Name>
<MetaDataDictionary>
<MetaData>
<Name>Do not edit this one</Name>
<Value>0</Value>
</MetaData>
</MetaDataDictionary>
</Item>
</Items>

Don't select all name tags, instead select only name tags which are children of /Items/Item tag.
The XPath query would look like /Items/Item/Name.
You can test it here. See the documentation for details.

How can I select a specific XML node and fetch the values in its child nodes

I'm trying to select a specific node and fetch the values in it's childnodes. This would normally be pretty easy, but the complication is that the nodes have the same name. My xml looks something like this;
<Settings>
<Config>
</Config>
<Items>
<Item>
<ID>Hello</ID>
<Pth>Somevalue</Pth>
<Zvb>True</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Overflow</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
</Items>
</Settings>
Each <ID>'s innertext is always unique. I now want to select the <Item> ,where it's <ID>'s innertext is "Stack". (I need the other childnode-values as well, like Pth, Zvb and Ico. So everything under <Item> basically)
I did this is powershell, and it looks something like this;
$script:specificItem = $dgvItems.rows[$_.RowIndex].Cells[1].Value
$script:fetch = #($xml.SelectNodes('//Item')) | Select-Object * | Where { $_.ID -like $specificItem }
So far I've got this (I'm in a RowEnter event of a datagridview):
XmlDocument xml = new XmlDocument();
xml.Load(GlobalVars.configfile);
int rowindex = dgvItemlist.CurrentCell.RowIndex;
dgvItemlist.Rows[rowindex].Cells[2].Value.ToString(); //This will contain for example "Stack"
XmlNodeList Items = xml.SelectNodes("//Items/Item"); //probably other ways to start as well
... but from here I struggle with filtering or selecting the one I want. I know this is a fairly common question, but I can't find a good solution for this exact issue.

You could also use XDocument (Linq to XML):
string xml =#"<Settings>
<Config>
</Config>
<Items>
<Item>
<ID>Hello</ID>
<Pth>Somevalue</Pth>
<Zvb>True</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Overflow</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
</Items>
</Settings>";
XDocument xdoc = XDocument.Parse(xml);
XElement desired = xdoc.Descendants("Item").FirstOrDefault(x=>(string)x.Element("ID")=="Stack");
if(desired!=null)
{
string Pth = (string)desired.Element("Pth");
string Zvb = (string)desired.Element("Zvb");
string Ico = (string)desired.Element("Ico");
}
desired will be the wanted element.

Try to change the last line of your code into:
XmlNodeList Items = xml.SelectNodes("//Items/Item[ID='Stack']");
This should return:
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>

Try the following. It will return the specific node you are looking for.
XmlNode itemNode = doc.SelectSingleNode("//ID[text()='Stack']").ParentNode;

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
}

XElement wont return any media:content / xmlns:media breaks XElement

Here is my sample xml:
<rss version='2.0' xmlns:media='http://search.yahoo.com/mrss/'>
<channel>
<title>Title of RSS feed</title>
<link>LINK</link>
<description>Details about the feed</description>
<language>en</language>
<item>
<title>TITLE</title>
<media:content url='http://LINK' type='' xmlns:media='http://search.yahoo.com/mrss' />
</item>
</channel>
</rss>
My Code:
XElement rss = XElement.Parse(xml);
XNamespace media = "http://search.yahoo.com/mrss/";
var item = rss.Element("channel").Elements("item").First();
var mediaa = item.Element(media + "content"); //this part doesn't work as expected
var url = mediaa.Attribute("url");
it seems as if the "xmlns:media='http://search.yahoo.com/mrss'" part of the media:content tag is breaking the .Element(media + "content").
(I can not change the feed)

Wrong namespace. There's no "/" at the end.

This should work:
XNamespace media = XNamespace.Get("http://search.yahoo.com/mrss/");
Also note that you have to fix it in the media:content element as well, it should say
<media:content url='http://LINK' type='' xmlns:media='http://search.yahoo.com/mrss/'/>

Should that be
XNamespace media = "{http://search.yahoo.com/mrss/}";
ie with curly braces?