private static decimal?GetPriceFromMarkets(Currency currency, MarketManager marketManager, Currency?quoteCurrency)
{
if (quoteCurrency == null)
{
return(null);
}
IEnumerable <MarketSummaryDto> markets = marketManager.GetPair(currency1: currency, currency2: quoteCurrency);
return(markets.Where(predicate: x => x.Last != null)
.OrderByDescending(keySelector: x => x.LastUpdated ?? DateTime.MinValue)
.FirstOrDefault()
?.Last);
}