public ForecastIORequest(string apiKey, float latF, float longF, Unit unit, Extend[] extend = null, Exclude[] exclude = null)
{
_apiKey = apiKey;
_latitude = latF.ToString(CultureInfo.InvariantCulture);
_longitude = longF.ToString(CultureInfo.InvariantCulture);
_unit = Enum.GetName(typeof(Unit), unit);
_extend = (extend != null) ? RequestHelpers.FormatExtendString(extend) : "";
_exclude = (exclude != null) ? RequestHelpers.FormatExcludeString(exclude) : "";
}