how to stop an “ex” like that. The canceltaion token is not always supported in Execute method. I would always like to kill task.

try
            {
                var ex = Execute(parameters, cancellationToken, performContext);

                await Task.WhenAny(ex
                    ,
                    ThrowIfCancellationRequested(ex, cancellationToken));

                return;
            }
            catch (Exception ex)
            {
                _loggerService.LogError(ex, "JobBase execute internal with raw params without job semaphore.");
                throw;
            }

private async Task ThrowIfCancellationRequested(Task task, CancellationToken cancellationToken)
{
try
{
while (true)
{
await Task.Delay(5000, cancellationToken);
cancellationToken.ThrowIfCancellationRequested();
}
}
catch
{
task.Dispose();
}
}

    protected override async Task Execute(Parameter parameter,
        CancellationToken cancellationToken,
        PerformContext performContext = null)
    {
        while (true)
        {
            await Task.Delay(TimeSpan.FromSeconds(10));
        }
    }

próbwałem chyba wszystkiego i nie mam pojęcią jak ubić zadanie.

methoda execute cały czas działa pomimo tego ze robie dispose na catch