private void RestoreMessagesFromDisk()
{
// try to populate the colleciton with values from disk, if any
var now = DateTime.UtcNow;
var messages =
from filename in Directory.GetFiles(_queueRecoveryFolder, "*.delayedqueue").AsParallel()
let lastModified = File.GetLastAccessTimeUtc(filename)
where now.Subtract(lastModified).TotalMinutes < 60
select new Tuple <string, Task <MailMessage> >(filename, ReadFromFile(filename));
messages.ForEachAsync(async m =>
{
if (await _queue.TryAddAsync(await m.Item2))
{
File.Delete(m.Item1);
}
});
}