private async Task <WeatherInfoCollection> performMergeTypeImportAsync(
WeatherInfoCollection newWeatherInfoCollection)
{
var matchedDates = newWeatherInfoCollection.Where(weatherInfo =>
ActiveWeatherInfoCollection.Active.Any(activeWeatherInfo =>
activeWeatherInfo.Date == weatherInfo.Date));
var unmatchedDates = newWeatherInfoCollection.Where(weatherInfo =>
ActiveWeatherInfoCollection.Active.All(activeWeatherInfo =>
activeWeatherInfo.Date != weatherInfo.Date));
await this.requestUserMergePreference(matchedDates);
foreach (var current in unmatchedDates)
{
ActiveWeatherInfoCollection.Active.Add(current);
}
return(ActiveWeatherInfoCollection.Active);
}