mp-main/AppStart/Helper/Profit/TradeService.cs

using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;

public class TradeService : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            int timespan = 50;
            await Task.Delay(timespan).ContinueWith(tsk =>
            {
                // MySystem.ProfitHelper.Instance.StartListenTradeDo();
            });
        }
    }
}