public Records Load()
{
if (File.Exists(fileName))
{
var document = XDocument.Load(fileName);
var data = new Records();
var records = document.Root.Elements("record");
foreach (var element in records)
{
data.Add(
new Record(
DateTime.Parse(
element.Attribute("datetime").Value,
CultureInfo.InvariantCulture),
float.Parse(
element.Attribute("amount").Value,
CultureInfo.InvariantCulture)));
}
return(data);
}
return(new Records());
}
public double Sum(Records records) => records.Sum(record => record.Amount);
public double Rate(Records records) =>
records.Count() > 1
? (Duration(records).TotalSeconds > 0
? Sum(records) / Duration(records).TotalSeconds
: 0.0f)
: 0.0f;