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;

C# Parsing XML in ISO-8859-1

I'm working on a tool for validating XML files grabbed from a mainframe. For reasons beyond my control every XML file is encoded in ISO 8859-1.
<?xml version="1.0" encoding="ISO 8859-1"?>
My C# application utilizes the System.XML library to parse the XML and eventually a string of a message contained within one of the child nodes.
If I manually remove the XML encoding line it works just fine. But i'd like to find a solution that doesn't require manual intervention. Are there any elegant approaches to solving this? Thanks in advance.
The exception that is thrown reads as:
System.Xml.XmlException' occurred in System.Xml.dll. System does not support 'ISO 8859-1' encoding. Line 1, position 31
My code is
XMLDocument xmlDoc = new XMLDocument();
xmlDoc.Load(//fileLocation);

As Jeroen pointed out in a comment, the encoding should be:
<?xml version="1.0" encoding="ISO-8859-1"?>
not:
<?xml version="1.0" encoding="ISO 8859-1"?>
(missing dash -).
You can use a StreamReader with an explicit encoding to read the file anyway:
using (var reader = new StreamReader("//fileLocation", Encoding.GetEncoding("ISO-8859-1")))
{
var xmlDoc = new XmlDocument();
xmlDoc.Load(reader);
// ...
}
(from answer by competent_tech in other thread I linked in an earlier comment).
If you do not want the using statement, I guess you can do:
var xmlDoc = new XmlDocument();
xmlDoc.LoadXml(File.ReadAllText("//fileLocation", Encoding.GetEncoding("ISO-8859-1")));
Instead of XmlDocument, you can use the XDocument class in the namespace System.Xml.Linq if you refer the assembly System.Xml.Linq.dll (since .NET 3.5). It has static methods like Load(Stream) and Parse(string) which you can use as above.

How to create the XDocument instance for loading the XML file after deserializing the the object?

I am developing window phone 7 application. I am new to the window phone 7 application. I am referring to the following link for XML Serialization & Deserialization.
http://www.codeproject.com/KB/windows-phone-7/wp7rssreader.aspx
In the above link the LoadFromIso() function is used for XML Deserialization. I want to load the xml file after deserialization in the above link. In simple one case we can do this as in the following code. Similar to the following code I want "doc" in the above link. In the following code we can perform the various opeations on the XML file by using LINQ to XML with following statement
doc = XDocument.Load(isfStream);
The complete code is as follows
IsolatedStorageFile isfData = IsolatedStorageFile.GetUserStoreForApplication();
XDocument doc = null;
IsolatedStorageFileStream isfStream = null;
if (isfData.FileExists(strXMLFile))
{
isfStream = new IsolatedStorageFileStream(strXMLFile, FileMode.Open, isfData);
doc = XDocument.Load(isfStream);
isfStream.Close();
}
In the similar way I want the instance of the XDocument after deserializing the object so that I can perform the various operations on the XML file by using LINQ to XML. Can you please provide me any code or link through which I can obtain the instance of the XDocument so that I can load the XML file & perform the various operation on the XML file by using the LINQ to XML ?

The variable doc in your code is an XDocument of the deserialized content.
You can perform your operations on/with doc.

A simple WP7 project demonstrating loading XML using XDocument and LINQ and data binding to a listbox here. As Matt advises the work gets done on your XDocument instance.
binding a Linq datasource to a listbox

adding element to xml file from c#.net

how to add element to a xml file using asp.net& c#.net inweb application

Here's an example of adding a new element to the root node:
XDocument doc = XDocument.Load("test.xml");
doc.Root.Add(new XElement("someNode", "some node value"));
doc.Save("test.xml");

Load the document using XmlDocument class and then modify it as needed. Reference documentation and examples here.

You can use XmlDocument.CreateElement method to create it and then to append it

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