Crawling a site for all external links

The following snippet crawls a specific site for all outbound links. Note the ExcludeHostsExcept-filter, or all outbound links will also be crawled.

var crawler = new Crawler
{
    ExcludeFilters = new IExcludeFilter[]
    {
        new ExcludeHostsExcept(new[] { "nyqui.st" }),
        new ExcludeImagesFilter(),
        new ExcludeTrackbacks(),
        new ExcludeMailTo(),
        new ExcludeJavaScript(), 
        new ExcludeAnchors(), 
    }
};
    
crawler.OnCompleted += () =>
{
    Console.WriteLine("[Main] Crawl completed!");
    Environment.Exit(0);
};

crawler.OnPageDownloaded += page =>
{
    Console.WriteLine("[Main] Downloaded page {0}", page.Url);

    // Write external links
    foreach (var link in page.Links)
    {
        if (link.TargetUrl.Host != page.Url.Host)
        {
            Console.WriteLine("Found outbound link from {0} to {1}", page.Url, link.TargetUrl);
        }
    }
};

crawler.Enqueue(new Uri("http://nyqui.st"));
crawler.Start();

Console.WriteLine("[Main] Crawler started.");
Console.WriteLine("[Main] Press [enter] to abort.");
Console.ReadLine();