private void UpdateTimeEstimate(DownloadInfoWrapper wrapper, int percent)
{
if (wrapper == null)
return;
if (percent <= 0)
return;
var elapsed = DateTime.UtcNow.Subtract(wrapper.StartTime);
var ticksPerPercent = elapsed.Ticks / percent;
var totalTicks = ticksPerPercent * 100;
var remainingTicks = totalTicks - elapsed.Ticks;
var timeRemaining = new TimeSpan(remainingTicks);
string message;
if (timeRemaining.TotalMinutes <= 60)
message = timeRemaining.TotalMinutes <= 1 ? "About 1 minute remains" : string.Format("About {0} minutes remain", timeRemaining.TotalMinutes);
else if (timeRemaining.TotalMinutes > 60)
message = "Over an hour remains";
else
message = "About 1 hour remains";
UpdateTimeEstimate(message);
}
protected virtual IResult DownloadFileAsync(FileInfoWrapper info)
{
try
{
using (var client = new ConfigurableWebClient { KeepAlive = false })
{
var targetPath = PathUtilities.DownloadFolder;
if (!Directory.Exists(targetPath))
return new DirectoryNotFound { Target = targetPath };
var uri = GetDownloadUri(info);
if (uri == null)
return new CouldNotDownloadFile
{
Issue = "Could not determine host target",
Target = info.FileName
};
client.Credentials = GetDownloadCredentials(uri);
client.DownloadFileCompleted += DownloadCompletedHandler;
client.DownloadProgressChanged += DownloadProgressHandler;
_completed = false;
if (string.IsNullOrWhiteSpace(info.FileName))
return new CouldNotDownloadFile
{
Issue = "Could not determine local target",
Target = info.FileName
};
if (string.IsNullOrWhiteSpace(DisplayName))
DisplayName = info.FileName;
targetPath = Path.Combine(targetPath, info.FileName);
var resultWrapper = new DownloadInfoWrapper
{
DisplayName = DisplayName,
Result = new NextResult(),
StartTime = DateTime.UtcNow
};
client.Headers.Add(HttpRequestHeader.UserAgent,
string.Format("{0} {1}",
Application.Current.GetProductName(),
Application.Current.GetVersion()));
InterveneIfConnectionLost();
client.DownloadFileAsync(uri, targetPath, resultWrapper);
do
{
Thread.Sleep(5);
Application.Current.DoEvents();
// check for cancel
_cancelRequested = CancelRequested();
if (!_cancelRequested) continue;
// handle cancel stuff
client.CancelAsync();
_cancelRequested = true;
SetCancelMessages();
} while (_completed == false);
UserInterfaceUtilities.WaitForMilliseconds(DateTime.UtcNow, 250);
UpdateProgressPercent(100);
UpdateTimeEstimate("");
UpdateProgressText(resultWrapper.Result.IsOk() ? "Download complete!" : "Download failed!");
return resultWrapper.Result;
}
}
catch (Exception e)
{
return new ExceptionOccurred(e);
}
}
