read and update XML file using C#

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I have an XML document in which part of it shown below. I want to read and update ‘base’ value of region ‘DEF’ using C#. I need your suggestions. Thanks!

XML

<scenario>
   <world>
      <region name="ABC">
         <demographics>
            <population year="2015">
               <totalPop>6377</totalPop>
            </population>
         </demographics>
         <GDP>
            <base>910</base>
            <force fillout="1" year="1975">0.5</force>
            <labor year="1990">0.02354</labor>
            <Convert constRatio="1">0.96187</Convert>
         </GDP>
      </region>
      <region name="DEF">
         <demographics>
            <population year="2015">
               <totalPop>3363</totalPop>
            </population>
         </demographics>
         <GDP>
            <base>739</base>
            <force fillout="1" year="1975">0.5</force>
            <labor year="1990">0.02354</labor>
            <Convert constRatio="1">0.96187</Convert>
         </GDP>
      </region>

      ....

    </world>
</scenario>

Posted 19-Oct-15 4:16am

getrelax

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Maciej Los · Accepted Answer · 2015-10-19T04:31:00

Something like this should work:

C#

//XDocument xdoc = XDocument.Load("fullfielname.xml");
var xNodeToChange = xdoc.Descendants("region")
    .Where(x=>(string)x.Attribute("name") =="DEF")
    .Select(x=>x.Descendants("base"))
    .SingleOrDefault()
    .First();

Console.WriteLine("Original value: {0}", xNodeToChange);
//xNodeToChange is type of XElement
//so we can change it's value ;)
xNodeToChange.Value = "Whatever";
Console.WriteLine("Changed value: {0}", xNodeToChange);
Console.WriteLine();
Console.WriteLine("Document content:");
Console.WriteLine("{0}", xdoc);
//save changes
//xdoc.Save("fullfilename.xml")

For further information, please see: XElement.Value Property[^]