private void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
DownloadingProgress?.Invoke(this, e);
}
public IEnumerable <byte> Download(string uri)
{
if (string.IsNullOrWhiteSpace(uri))
{
throw new ArgumentNullException(nameof(uri));
}
IsStarted = true;
var credentials = new NetworkCredential("anonymous", "");
var sizeRequest = WebRequest.Create(uri);
sizeRequest.Credentials = credentials;
sizeRequest.Method = WebRequestMethods.Ftp.GetFileSize;
var fileSize = sizeRequest.GetResponse().ContentLength;
DownloadingFileSize?.Invoke(this, fileSize);
var request = (FtpWebRequest)WebRequest.Create(uri);
request.KeepAlive = true;
request.UsePassive = true;
request.UseBinary = true;
request.Method = WebRequestMethods.Ftp.DownloadFile;
request.Credentials = credentials;
using (var responseStream = request.GetResponse().GetResponseStream())
{
var buffer = new byte[4096];
var read = 0;
long bytesReceived = 0;
var stopwatch = new Stopwatch();
stopwatch.Start();
var timeToDownload = TimeSpan.FromSeconds(0);
while ((read = responseStream.Read(buffer, 0, buffer.Length)) > 0)
{
bytesReceived += read;
long seconds = stopwatch.ElapsedMilliseconds / 1000;
if (seconds > 0)
{
double currentSpeed = bytesReceived / seconds;
if (currentSpeed > 0)
{
timeToDownload = TimeSpan.FromSeconds((fileSize - bytesReceived) / Math.Round(currentSpeed, 2));
}
}
var progress = (bytesReceived / (double)fileSize) * 100.0;
DownloadingProgress?.Invoke((int)progress, timeToDownload, bytesReceived, fileSize);
for (int i = 0; i < read; i++)
{
yield return(buffer[i]);
}
}
}
IsStarted = false;
}