public void WriteSettingsFile()
{
if (!xDoc.Descendants("someNodeName").Any())
{
return;
}
foreach (var desc in xDoc.Descendants("someNodeName"))
{
desc.SetValue(TheAnswerToLifeUniverseAndEverything);
}
xDoc.Save(SettingsFile);
}
public decimal?GetPrice(string bookId)
{
var book = xDoc.Descendants("book")
.Where(x => x.Attribute("id").Value == bookId)
.SingleOrDefault();
return(decimal.TryParse(book?.Element("price")?.Value, out decimal price) ? price : (decimal?)null);
}