public TradesController()
{
if (_tradeProvider == null)
{
_tradeProvider = new TradeProvider();
}
}
public TradeMiddleware(RequestDelegate next, ILogger <TradeMiddleware> logger, TradeProvider tradeProvider)
{
_next = next ?? throw new ArgumentNullException(nameof(next));
_logger = logger;
_tradeProvider = tradeProvider;
}