Question

I have the following xml file

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfParams xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Params Key="Domain" Value="User123">
    <Variable>
      <Name>Domain</Name>
      <Type>String</Type>
      <Value>User123</Value>
    </Variable>
  </Params>
  <Params Key="Password" Value="Password123">
    <Variable>
      <Name>Password</Name>
      <Type>String</Type>
      <Value>Password123</Value>
    </Variable>
  </Params>
  <Params Key="Username" Value="Domain123">
    <Variable>
      <Name>Username</Name>
      <Type>String</Type>
      <Value>Domain123</Value>
    </Variable>
  </Params>
</ArrayOfParams>

I would like to change the password from Password123 to NewPassword123
The xml should be changed in 2 places:

<Params Key="Password" Value="Password123">

and

<Value>Password123</Value>

How can this be done?

EDIT the XML already exist, not my design. i just need to change it

I tried to use XDocument, but am having problems with the query.
can you provide a linq that knows how to query it?

Answer 1

How about using LINQ to XML?

var doc = XDocument.Parse(xmlString);

var passwordParams = doc.Root.Elements("Params").SingleOrDefault(e => (string)e.Attribute("Key") == "Password");

if(passwordParams != null)
{
    passwordParams.Attribute("Value").Value = newPasswordString;
    passwordParams.Element("Variable").Element("Value").Value = ewPasswordString;
}

After that you can save the document wherever you want.

I can’t test it right now, but general idea should be clear.