Jak ponawiać operacje w .NET z wykorzystaniem Polly?

filtr.txt

outbound and ip.DstAddr >= 185.255.40.24 and ip.DstAddr <= 185.255.40.24

Program.cs

class Program
{
    private static NLog.Logger _logger = NLog.LogManager.GetCurrentClassLogger();

    static void Main(string[] args)
    {
        _logger.Info("Start");
        try
        {
            var content = Download("http://plawgo.pl");

            _logger.Info("Success");
        }
        catch (Exception ex)
        {
            _logger.Fatal(ex, "Error");
        }
        _logger.Info("End");
    }
    static string Download(string url)
    {
        var client = new WebClient();

        return client.DownloadString(url);
    }
}

Program2.cs

static string DownloadWithRetry(string url)
{
    var client = new WebClient();

    return Policy
        .Handle<WebException>()
        .Retry(3, (ex, retryCount) =>
        {
            _logger.Error(ex, $"Error - try retry (count: {retryCount})");
        })
        .Execute(() => client.DownloadString(url));
}

Program3.cs

static string DownloadWithRetryAndDelay(string url)
{
    var client = new WebClient();

    return Policy
        .Handle<WebException>()
        .WaitAndRetry(new[]
        {
            TimeSpan.FromSeconds(10),
            TimeSpan.FromSeconds(20),
            TimeSpan.FromSeconds(50)
        }, (ex, timeSpan, retryCount, context) =>
        {
            _logger.Error(ex, $"Error - try retry (count: {retryCount}, timeSpan: {timeSpan})");
        })
        .Execute(() => client.DownloadString(url));
}

Program4.cs

static string DownloadWithRetryForever(string url)
{
    var client = new WebClient();

    return Policy
        .Handle<WebException>()
        .RetryForever(ex =>
        {
            _logger.Error(ex, $"Error - try retry forever");
        })
        .Execute(() => client.DownloadString(url));
}