unable to persist newly added tags in xml using LINQ

StackOverflow https://stackoverflow.com/questions/23340991

  •  10-07-2023
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Question

I have the following xml file:

<?xml version="1.0" encoding="UTF-8"?>

<!-- New XML document created with EditiX XML Editor (http://www.editix.com) at Tue Mar 18 22:41:05 IST 2014 
-->
<html xsi:NamespaceSchemaLocation="http://www.w3.org/1999/xhtml DM_Project.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <head>
        <title>title1</title>
    </head>
    <body>
        <fragment name="heading" id="heading1">
            <h1>Heading 1</h1>
        </fragment>
    </body>
</html>

I am using LINQ to add another fragment tag to my xml file, which is:

XDocument xdocument = XDocument.Load("C:\\Users\\Administrator\\Desktop\\DM_Project.xml");
var id = "heading3";
var name="heading";
var content = "This is the data part";
var temp = xdocument.Descendants("fragment").First();
temp.Parent.Add(new XElement("fragment", content, new XAttribute("id", id), new XAttribute("name", name)));
var temp1 = xdocument.Descendants("fragment");
Console.WriteLine(temp1);

The result of the query is:

<fragment name="heading" id="heading1">
  <h1>Heading 1</h1>
</fragment> 
<fragment id="heading3" name="heading">This is the data part</fragment>

If one can observe a few fragment tag having id "heading3" is added. However, if the try to extract the fragment tags again, using the below query:

XDocument xdocument = XDocument.Load("C:\\Users\\Administrator\\Desktop\\DM_Project.xml");
var temp = xdocument.Descendants("fragment");
Console.WriteLine(temp);

The result is:

 <fragment name="heading" id="heading1">
      <h1>Heading 1</h1>
    </fragment>

The newly added tag is missing. How can I get the data to be persistant? Am I missing something here? Or, this entire approach is itself wrong?

I am using LINQPad to test my queries.

Thank you.

Was it helpful?

Solution

You are not saving document back to file. After you finished editing it call XDocument.Save:

string path = @"C:\Users\Administrator\Desktop\DM_Project.xml";
XDocument xdocument = XDocument.Load(path);
// modify document
xdocument.Save(path);

Next time when you will execute your code (i.e. load document and query it) new elements will be there.

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