保存修改的XML- WP8 C＃

Question

I've been trying to modify and save an xml dynamically. i've tried to find some answers but i didnt manage to. i Succeeded to modify and change the xml data, but i encounter a problem with saving. here is the code:

var resourceStreamInfo = Application.GetResourceStream(uri);
using (var stream = resourceStreamInfo.Stream)
{
     doc = XDocument.Load(stream);
     var Currencies = doc.Descendants("Currency");
     XElement root = Currencies.Where(b => b.Element("ID").Value.IndexOf(CurrencyID, StringComparison.CurrentCultureIgnoreCase) >= 0).First();
     root.SetElementValue("Rate", rate);

     doc.Save(stream);
}   

I understood that my stream is readonly, but what should I do?

Answer 1

From Application.GetResourceStream I guess your are reading a file from your project bundle. You cannot modify it. You need to save the modified file to isolated storage