Question

It is easy to read an XML file and get the exact Node Text, but how do I Update that Node with a new value?

To read:

public static String GetSettings(SettingsType type, SectionType section) {     XmlTextReader reader = new XmlTextReader(HttpContext.Current.Request.MapPath(APPSETTINGSPATH));     XmlDocument document = new XmlDocument();     document.Load(reader);      XmlNode node = document.SelectSingleNode(                         String.Format('/MyRootName/MySubNode/{0}/{1}',                         Enum.Parse(typeof(SettingsType), type.ToString()),                         Enum.Parse(typeof(SectionType), section.ToString())));            return node.InnerText; } 

to write …?

public static void SetSettings(SettingsType type, SectionType section, String value) {     try     {         XmlTextReader reader = new XmlTextReader(HttpContext.Current.Request.MapPath(APPSETTINGSPATH));         XmlDocument document = new XmlDocument();         document.Load(reader);          XmlNode node = document.SelectSingleNode(                             String.Format('/MyRootName/MySubNode/{0}/{1}',                             Enum.Parse(typeof(SettingsType), type.ToString()),                             Enum.Parse(typeof(SectionType), section.ToString())));         node.InnerText = value;         node.Update();     }     catch (Exception ex)     {         throw new Exception('Error:', ex);     } } 

Note the line, node.Update(); does not exist, but that’s what I wanted 🙂

I saw the XmlTextWriter object, but it will write the entire XML to a new file, and I just need to update one value in the original Node, I can save as a new file and then rename the new file into the original name but… it has to be simpler to do this right?

Any of you guys have a sample code on about to do this?

Thank you

Answer 1

You don’t need an ‘update’ method – setting the InnerText property updates it. However, it only applies the update in memory. You do need to rewrite the whole file though – you can’t just update a small part of it (at least, not without a lot of work and no out-of-the-box support).