Replacing a string in a xml doc with C#

Unity Engine
1

What I want to do is to replace a string in a xml doc. right now my xml doc looks like this:

<?xml version="1.0"?>
<Data>
  <Player id="1">
    <name>TestName</name>
  </Player>
</Data>

What I want to do now, is to replace TestName with another string.

I have a method that looks like this, but I’m not sure if I’m going in the right direction, could really use some help getting this right.

void WriteXML(string xmlData)
{

    string name = "NewPlayer";
    XmlDocument xmlDoc = new XmlDocument();
    xmlDoc.Load(new StringReader(xmlData));
    XmlNode node = xmlDoc.SelectSingleNode("data/player/name");

    //DO something to replace the innnertext of the node with a new string
    // It is here I could use some help.

    xmlDoc.Save(xmlData);

 }

Some help would really be appriciated. Thanks in advance.

2

its kind of funny that you answered your own question…

node.InnerText = “NewName”

3

I know thats what I should do. But I’m not sure how to do it. if I just do node.InnerText = “NewName”… I get an exception object not set to an instance of an object…

4

Its not funny, its fantastic. People looking for solutions before asking!

5

touche!

Well that just means your node is null, ie. you havnt actually found the node correctly…

6

Ok, I fixed that issue, I changed the innertext of the node. But how do I write the new node back to the xml file? When I change the nod like that it just changes the innertext of the node but I guess I need to write the info in the xml file before I can save it.

7

Did you look at the file after this line?

xmlDoc.Save(xmlData);

I dont see why that wouldnt have saved the change, of course I am assuming that xmlData is a path.

8

Hello guys,

I am having similar problem like above mentioned.

public static string XmlMessageWriter(string xmlData, string[] xmlNodeNames, List<string> xmlNewValues)
    {
        string data = xmlData;
        Debug.Log("Before Editing" + data);

        XmlDocument doc = new XmlDocument();
        doc.LoadXml(data);

        for (int i = 0; i < xmlNodeNames.Length; i++)
        {
          
            // edit xml child nodes with new values.  
            doc.SelectSingleNode("//" + xmlNodeNames[i]).InnerXml = xmlNewValues[i];
           // Child nodes names and new values come from method parameter above
                   
        }
        Debug.Log("After Editing" + data);
        return data;
    }

This method does 3 things:

  1. get xml data as a parameter
  2. edit its values
  3. return back after editing.

Problem is returned variable was not edited even though it was edited in the for loop.
I think I am using xml string not xml file. I found some solutions but all of them for xml file not xml string (xml file can be saved by using xml.Save method).

Can anybody suggest any solutions please?

9

This is the solutions for question above which I asked:

https://stackoverflow.com/questions/6161159/converting-xml-to-string-using-c-sharp