void CheckFileOrCreateFile()
{
DownloaderHelper.CheckFileOrCreateFile(this, fileLocker);
}
void DownloadInternal()
{
if (Status != DownloadStatus.Waiting)
{
return;
}
HttpWebRequest webRequest = null;
HttpWebResponse webResponse = null;
Stream responseStream = null;
MemoryStream downloadCache = null;
lastStartTime = DateTime.Now;
try
{
if (!HasChecked)
{
string filename = string.Empty;
CheckUrlAndFile(out filename);
}
EnsurePropertyValid();
Status = DownloadStatus.Downloading;
webRequest = DownloaderHelper.InitializeHttpWebRequest(this);
if (EndPoint != int.MaxValue)
{
webRequest.AddRange(StartPoint + DownloadedSize, EndPoint);
}
else
{
webRequest.AddRange(StartPoint + DownloadedSize);
}
webResponse = (HttpWebResponse)webRequest.GetResponse();
responseStream = webResponse.GetResponseStream();
downloadCache = new MemoryStream(MaxCacheSize);
byte[] downloadBuffer = new byte[BufferSize];
int bytesSize = 0;
CachedSize = 0;
int receivedBufferCount = 0;
while (true)
{
bytesSize = responseStream.Read(downloadBuffer, 0, downloadBuffer.Length);
if (Status != DownloadStatus.Downloading || bytesSize == 0 || MaxCacheSize < CachedSize + bytesSize)
{
try
{
WriteCacheToFile(downloadCache, CachedSize);
DownloadedSize += CachedSize;
if (Status != DownloadStatus.Downloading || bytesSize == 0)
{
break;
}
downloadCache.Seek(0, SeekOrigin.Begin);
CachedSize = 0;
}
catch (Exception ex)
{
OnDownloadCompleted(new DownloadCompletedEventArgs(null, DownloadedSize, TotalSize, TotalUsedTime, ex));
return;
}
}
downloadCache.Write(downloadBuffer, 0, bytesSize);
CachedSize += bytesSize;
receivedBufferCount++;
if (receivedBufferCount == BufferCountPerNotification)
{
InternalDownloadProgressChanged(CachedSize);
receivedBufferCount = 0;
}
}
usedTime = usedTime.Add(DateTime.Now - lastStartTime);
if (Status == DownloadStatus.Pausing)
{
Status = DownloadStatus.Paused;
}
else if (Status == DownloadStatus.Canceling)
{
Status = DownloadStatus.Canceled;
}
else
{
Status = DownloadStatus.Completed;
return;
}
}
catch (Exception ex)
{
OnDownloadCompleted(new DownloadCompletedEventArgs(null, DownloadedSize, TotalSize, TotalUsedTime, ex));
return;
}
finally
{
if (responseStream != null)
{
responseStream.Close();
}
if (webResponse != null)
{
webResponse.Close();
}
if (downloadCache != null)
{
downloadCache.Close();
}
}
}
public void CheckUrl(out string fileName)
{
fileName = DownloaderHelper.CheckUrl(this);
}