Problems writing to existing xml

Questions & Answers
1

Hi! i followed some tutorials regarding XML files and im having my issues writing to an existing xml, my xml is something like this (real one have more items)

<?xml version="1.0" encoding="utf-8"?>
<levels>
        <name>Level 1-1</name>
	<title>This is level 1</title>
	</level>
	<name>Level 1-2</name>
        <title>This is level 2</title>
	</level>
</levels>

I’ve a script to load this xml and put it’s data to some variables so i can use ingame, this is the script:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.IO;


public class LoadXmlData : MonoBehaviour // the Class
{
	public int actualLevel = 1;
	static int LevelMaxNumber;
	static int WaipointCounter = 0;
	
	public static string lvlname = "";
	public static string lvltitle = "";
	
	public TextAsset XMLData;
	
	List<Dictionary<string,string>> levels = new List<Dictionary<string,string>>();
	Dictionary<string,string> obj;
	
	
	void Start()
	{	//Timeline of the Level creator
		GetLevel();
		StartCoroutine(LevelLoadInfo(0.0F));
		LevelMaxNumber = levels.Count;
	}
	
	public void GetLevel()
	{
		XmlDocument xmlDoc = new XmlDocument(); // xmlDoc is the new xml document.
		xmlDoc.LoadXml(XMLData.text); // load the file.
		XmlNodeList levelsList = xmlDoc.GetElementsByTagName("level"); // array of the level nodes.
	
		foreach (XmlNode levelInfo in levelsList)
		{
			XmlNodeList levelcontent = levelInfo.ChildNodes;
			obj = new Dictionary<string,string>(); // Create a object(Dictionary) to colect the both nodes inside the level node and then put into levels[] array.
			
			foreach (XmlNode levelsItens in levelcontent) // levels itens nodes.
			{
				if(levelsItens.Name == "name")
				{
					obj.Add("name",levelsItens.InnerText); // put this in the dictionary.
				}


				if(levelsItens.Name == "title")
				{
					obj.Add("title",levelsItens.InnerText); // put this in the dictionary.
				}

				
			}
			levels.Add(obj); // add whole obj dictionary in the levels[].
		}
	}
	

	IEnumerator LevelLoadInfo(float Wait)
	{
		levels[actualLevel-1].TryGetValue("name",out lvlname);

		levels[actualLevel-1].TryGetValue("title",out lvltitle);

		yield return new WaitForSeconds(Wait);

	}


	void Update()
	{
	}

}

ok, everything works fine, but i would like to know how i could change some data and put it back to the xml file and save it, for example, how to change the level 2 title, i tried a lot of different things but none work at all, can i access the node directly?, do i have to loop every node and find the one a need like in the load script? how is the way to do it? thanks in advance!

2

First, add some tag in your xml in question. Second, if you want to rewrite data in a XML file, the simplest way, it to create a text line, and then to save it in the file or somewhere else. I will write function of saving of your data:

 public void myReSave() {
  //create string as xml
  string tempStr = "";
  //Fill variable
  tempStr = tempStr + "<levels>";
  //Your all data level in dictionaries, change title of level 2 and save all dictionaries
  (levels[1])["title"] = "MegaTitle Level 2"; //change title
  for(int i = 0; i < levels.Count; i++) {
   //Create one level data
   tempStr = tempStr + "<level>";
   tempStr = tempStr + "<name>" + (levels*)["name"] + "</name>";*

tempStr = tempStr + “” + (levels*)[“title”] + “”;*
tempStr = tempStr + “”;
}
tempStr = tempStr + “”;
//And save your string into your file.
//Simple way, but remember, that filepath shall exist already, differently there will be an error
System.IO.File.WriteAllText(“C:\yourfilepath\yourtextfile.xml”, tempStr);
}
I hope that it will help you.