Polly 在 X 次重试后继续

Polly continue after X retries

我在 Xamarin 项目中使用 Polly,效果非常好。我面临的问题是,在重试 2 次后,它应该继续该方法,但由于某种原因,它卡住了并不断重试。有谁知道我该怎么做?

private async Task<List<EventDto>> GetEventsErrorRemoteAsync()
{
    List<EventDto> conferences = null;

    if (CrossConnectivity.Current.IsConnected) 
    {
        // Retrying a specific amount of times (5)
        // In this case will wait for
        //  1 ^ 2 = 2 seconds then
        //  2 ^ 2 = 4 seconds then
        //  3 ^ 2 = 8 seconds then
        //  4 ^ 2 = 16 seconds then
        //  5 ^ 2 = 32 seconds
        conferences = await Policy
            .Handle<Exception>()
            .WaitAndRetryAsync(
                retryCount: 2, 
                sleepDurationProvider:retryAttempt => 
                    TimeSpan.FromSeconds(Math.Pow (2, retryAttempt)), 
                onRetry: (exception, timeSpan, context) => 
                {
                    var ex = (ApiException)exception;

                    //Do something with exception. Send to insights (now hockeyapp)
                    Debug.WriteLine($"Error: {ex.ReasonPhrase} | 
                        TimeSpan: {timeSpan.Seconds}");
                    return;
                }).ExecuteAsync(async () => 
                    await _eventService.GetEventsWithError());
    }
    return conferences;
}

关于相同 Github 问题的详细回答问题:https://github.com/App-vNext/Polly/issues/106

政策没有卡住,一直在重试。相反,如果重试策略在 .ExecuteAsync() 内执行委托时所做的最终尝试仍然抛出,则重试策略将重新抛出此最终异常。由于您没有捕获和处理该异常,该方法自然不会继续执行 return 语句。