public void UpdateCurrencyAmount(string currency, double amount)
{
var mutable = CurrencyAmounts.ToDictionary(x => x.Key, x => x.Value);
mutable[currency] += amount;
CurrencyAmounts = mutable.ToImmutableDictionary <string, double>();
}
private void OnSerializing(StreamingContext context)
{
_LatestTrades = LatestTrades.ToArray();
_CurrencyAmounts = CurrencyAmounts.ToDictionary(x => x.Key, x => x.Value);
}
