public async Task Preloadreadings(IList <Reading> majorReadings, IList <Reading> minoReadings)
{
ReadingsMajor = majorReadings.Select(x => new HistoryReadingViewModel(x, this)).ToList();
ReadingsMinor = minoReadings.Select(x => new HistoryReadingViewModel(x, this)).ToList();
firstDate = ReadingsMajor.FirstOrDefault()?.Reading.Time;
var first = ReadingsMinor.FirstOrDefault()?.Reading.Time;
if (first < firstDate || firstDate == new DateTime())
{
firstDate = first;
}
lastDate = ReadingsMajor.LastOrDefault()?.Reading.Time;
var last = ReadingsMajor.FirstOrDefault()?.Reading.Time;
if (last > lastDate || lastDate == new DateTime())
{
lastDate = last;
}
if (firstDate != null)
{
dateSpan = (lastDate.Value - firstDate.Value);
}
await LoadGraph(ReadingsMajor, ReadingsMinor);
}
public void RemoveReading(HistoryReadingViewModel historyReadingViewModel)
{
ReadingsMajor.Remove(historyReadingViewModel);
ReadingsMinor.Remove(historyReadingViewModel);
}