private static void SetForecastData <TIn, TOut>(
Dictionary <DateTime, ForecastInfo> forecasts,
Dictionary <Period, TIn> periodData,
Func <IEnumerable <KeyValuePair <Period, TIn> >, TOut> getValue,
Action <ForecastInfo, TOut> setValue)
{
if (periodData != null)
{
foreach (var dateGroup in periodData.GroupBy(pair => pair.Key.Start.Date))
{
DateTime date = dateGroup.Key;
TOut value = getValue(dateGroup);
if (!forecasts.TryGetValue(date, out ForecastInfo forecast))
{
forecast = new ForecastInfo
{
Day = date.ToString("ddd"),
#pragma warning disable MEN013 // Use UTC time. This compares against the user's local date.
IsToday = date == DateTime.Today,
#pragma warning restore MEN013 // Use UTC time
};
forecasts.Add(date, forecast);
}
setValue(forecast, value);
}
}
}
protected override async Task UpdateAsync()
{
if (string.IsNullOrEmpty(this.Settings.UserLocation))
{
this.Weather.SetError("A US Zip code location must be specified.");
}
else
{
if (this.locationRequestParameters == null)
{
this.locationRequestParameters = await this.CacheLocationRequestParametersAsync().ConfigureAwait(false);
}
if (this.locationRequestParameters == null)
{
this.Weather.SetError("Unable to determine latitude and longitude.");
}
else
{
Uri weatherDataUri = BuildlUri("http://forecast.weather.gov/MapClick.php", this.locationRequestParameters);
XElement weatherData = await this.GetXmlAsync(weatherDataUri).ConfigureAwait(false);
if (this.IsDwml(weatherData))
{
var dataElements = weatherData.Elements("data");
this.Weather.Current = this.GetCurrent(dataElements.FirstOrDefault(e => (string)e.Attribute("type") == "current observations"));
this.Weather.DailyForecasts = this.GetForecasts(dataElements.FirstOrDefault(e => (string)e.Attribute("type") == "forecast"));
// After mid-day, Weather.gov stops giving the high temp and icon forecast for today, so we'll get it from Current.
ForecastInfo todaysForecast = this.Weather.DailyForecasts.FirstOrDefault(f => f.IsToday);
if (todaysForecast != null && this.Weather.Current != CurrentInfo.Missing)
{
todaysForecast.ImageUri = this.Weather.Current.ImageUri;
if (todaysForecast.High == null)
{
todaysForecast.High = this.Weather.Current.TemperatureValue;
if (todaysForecast.High < todaysForecast.Low)
{
todaysForecast.Low = todaysForecast.High;
}
}
}
}
}
}
}