Action before retry

Question

I have this use case where, for some errors, I need to perform an action before the retry; otherwise, just retry.

Something like this:

try
{
action:
    <action>
}
catch (SpecialException)
{
    <cleanup>
    goto action:
}
catch (Exception)
{
    goto action:
}

Is this possible with Polly?

Answer 1

register handle with Retry(Action<Exception, int> onRetry), the action will be executed before retry. so you can clear up in some case.

Policy.Handle<Exception>().Retry((ex, count) => {
    if(ex is NotImplementedException)
    {
        Console.WriteLine("clear up");
    }
    }).Execute(() => {
        Console.WriteLine("throw exception");
        throw new Exception();//or NotImplementedException
    });