Develop Reference

How do I edit Node Values in an Xml File with C#

I am trying to change the values in a Farming simulator 22 savegame xml file from C# in visual studio. There are a lot of nodes so I have reduced them to make things easier. I want to know how to replace the value in the node using C# with out having to create and rebuild the xml file from scratch.
the path to the xml file is: (C:\Users\Name\Documents\My Games\FarmingSimulator2022\savegame1\careerSavegame.xml)
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<careerSavegame revision="2" valid="true">
<settings>
<savegameName>My game save</savegameName>
<creationDate>2022-05-03</creationDate>
<mapId>MapFR</mapId>
<mapTitle>Haut-Beyleron</mapTitle>
<saveDateFormatted>2022-08-22</saveDateFormatted>
<saveDate>2022-08-22</saveDate>
<resetVehicles>false</resetVehicles>
</careerSavegame>

You can use the System.Xml.Linq namespace to access the xml file. This will load the file in the memory.
There is one class inside it, XDocument, that represents the xml document.
String filePath = "C:\Users\Name\Documents\My Games\FarmingSimulator2022\savegame1\careerSavegame.xml"
XDocument xdoc = XDocument.Load(filePath);
var element = xdoc.Elements("MyXmlElement").Single();
element.Value = "foo";
xdoc.Save("file.xml");
You can set the element variable as per the one which is needed to be replaced.

Through some research I found the solution to editing the values within the nodes. In this example I only change the value of savegameName, but it will be the same for the rest.
//Routing the xml file
XmlDocument xmlsettings = new XmlDocument();
xmlsettings.Load(#"D:\careerSavegame.xml");
//Setting values to nodes through innertext
String FarmNameSetting = "Martek Farm";
XmlNode savegameNamenode =
xmlsettings.SelectSingleNode
("careerSavegame/settings/savegameName");
savegameNamenode.InnerText = FarmNameSetting;

Issue with loading xml in C# containing google kml

I am trying to access the second element in this xml (google kml type) of file and the issue I am having is I get returned null values for my code unless I remove out the <kml xmlns="http://earth.google.com/kml/2.0"> and the related close from the source file. Here is the code I'm using. (mind you this works if I remove the specified line so what I'm looking for is a clean way to process this file without editing the supplied source file.)
XmlDocument doc = new XmlDocument();
doc.Load("2014_q2.xml");
XmlNodeList xnlNodes = doc.SelectNodes("/kml/Document/Folder");
var Node2Use = xnlNodes.Item(1);
here is the top of the source file:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.0">
<Document>
<open>1</open>
<Folder>
<name>Pts_2014_q3_point Drawing</name>
<Placemark>
<description>HOLTSVILLE</description>
<name>00501</name>
<Style>
<IconStyle>
<color>ffc0c0c0</color>
I have a break on the var Node2Use = xnlNodes.Item(1); line so I can see the contents and thats where I see that I have a zero value where I should have 2 for Folder (like mentioned I get the 2 when I remove out that kml tagged line.)

You need to include the namespace. Something like this:
XmlDocument doc = new XmlDocument();
doc.Load("2014_q2.xml");
XNamespace ns = "http://earth.google.com/kml/2.0";
XmlNodeList xnlNodes = doc.SelectNodes(ns + "/kml/Document/Folder");

unable to change the value of an XML tag

Here's the XML:
<PolicyChangeSet schemaVersion="2.1" username="" description="">
<Attachment name="" contentType="">
<Description/>
<Location></Location>
</Attachment>
</PolicyChangeSet>
I'm just trying to add the value "XXX" between the "location" tag.
I tried this but it isn't working:
string newValue = string.Empty;
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(AppVars.pxCentralXMLPayloadFilePath);
node = xmlDoc.SelectSingleNode("/PolicyChangeSet/Attachment/location");
node.InnerText = "XXX";
xmlDoc.Save(AppVars.pxCentralXMLPayloadFilePath);
What am I missing?!

doc.Save(#"XML FILE PATH"); //This will save the changes to the file.

Please use iteration through ChildNodes of XmlDocument - as described in walkthrough from MS Support site. According to documentation of SelectSingleNode() method:
The XmlNode should not be expected to be connected "live" to the XML
document. That is, changes that appear in the XML document may not
appear in the XmlNode, and vice versa.

Found out what the problem was CASE SENSITIVITY.

How to select xml root node when root node has attribute?

I am trying to select all the child nodes of root node of an xml document using XPath query.
My xml file looks something like following :
<?xml version="1.0" encoding="UTF-8" ?>
<root>
<automotive_industry>
<automotive />
<rail_global_services />
</automotive_industry>
</root>
AND
<?xml version="1.0" encoding="UTF-8" ?>
<root xmlns="http://www.my_department.my_company.com/project_name">
<automotive_industry>
<automotive />
<rail_global_services />
</automotive_industry>
</root>
C# Code to select root node is as follows :
XmlDocument gazetteDocument = new XmlDocument();
gazetteDocument.Load(xmlFilePath);
XmlNodeList allNodes = gazetteDocument.SelectNodes("root");
This code works fine, it selects all the child nodes of root node when root node does not have any attribute that is, it works for 1st xml file but does not work for 2nd xml file because 2nd file has xmlns attribute.
Does anyone knows how to select all the child nodes of root node when root node has attributes??
EDIT :
I found one XPath query : /* This query selects root node no matter whether it has any attribute or not. Once root node is selected, I can iterate through its all the child nodes .

Although the namespace in your XML document is fine, you need to use it in your SelectNodes.
Use this code for your second XML:
XmlDocument gazetteDocument = new XmlDocument();
gazetteDocument.Load(xmlFilePath);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(gazetteDocument.NameTable);
nsmgr.AddNamespace("ns", "http://www.my_department.my_company.com/project_name");
XmlNodeList allNodes = gazetteDocument.SelectNodes("ns:root", nsmgr);
The better way would be to use XDocument and corresponding classes. They are a lot easier to work with.

I don't know the old xml methods of C#, but you could always open the file to read as normal text, and then read to the first node and parse it however you like.

You can use GetElementsByTagName method below are the snippet of my code
XmlDocument gazetteDocument = new XmlDocument();
gazetteDocument.Load(xmlFilePath);
XmlNodeList allNodes = gazetteDocument.GetElementsByTagName("root");

No Nodes Selected from Atom XML document using XPath?

I'm trying to parse an Atom feed programmatically. I have the atom XML downloaded as a string. I can load the XML into an XmlDocument. However, I can't traverse the document using XPath. Whenever I try, I get null.
I've been using this Atom feed as a test: http://steve-yegge.blogspot.com/feeds/posts/default
Calling SelectSingleNode() always returns null, except for when I use "/". Here is what I'm trying right now:
using (WebClient wc = new WebClient())
{
string xml = wc.DownloadString("http://steve-yegge.blogspot.com/feeds/posts/default");
XmlNamespaceManager nsMngr = new XmlNamespaceManager(new NameTable());
nsMngr.AddNamespace(string.Empty, "http://www.w3.org/2005/Atom");
nsMngr.AddNamespace("app", "http://purl.org/atom/app#");
XmlDocument atom = new XmlDocument();
atom.LoadXml(xml);
XmlNode node = atom.SelectSingleNode("//entry/link/app:edited", nsMngr);
}
I thought it might have been because of my XPath, so I've also tried a simple query of the root node since I knew the root should work:
// I've tried both with & without the nsMngr declared above
XmlNode node = atom.SelectSingleNode("/feed");
No matter what I do, it seems like it can't select anything. Obviously I'm missing something, I just can't figure out what. What is it that I need to do in order to make XPath work on this Atom feed?
EDIT
Although this question has an answer, I found out this question has an almost exact duplicate: SelectNodes not working on stackoverflow feed

While the C# implementation may allow default namespaces (I don't know), the XPath 1.0 spec doesn't. So, give "Atom" its own prefix:
nsMngr.AddNamespace("atom", "http://www.w3.org/2005/Atom");
And change your XPath appropriately:
XmlNode node = atom.SelectSingleNode("//atom:entry/atom:link/app:edited", nsMngr);

Load XML from a string and lookup for any 'Errors/Error' nodes.
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xmlResult);
XmlNamespaceManager nm = new XmlNamespaceManager(xmlDoc.NameTable);
nm.AddNamespace("ns", "http://somedomain.com/namespace1/2"); //ns - any name, make sure it is same in the below line
XmlNodeList errors = xmlDoc.SelectNodes("/ns:*//ns:Errors/ns:Error", nm);
-Mathulan