private void RiseFtpСredentialsNeed(FtpСredentialsNeedEventArgs e)
{
EventHandler <FtpСredentialsNeedEventArgs> handler = FtpСredentialsNeed;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Начинает закачку данных с опеределеного ресураса.
/// </summary>
/// <param name="url"></param>
/// <param name="filePath">Путь к закачиваемому файлу. </param>
public void Start(string url, string filePath)
{
_filePath = filePath;
var fileUri = new Uri(url);
if (File.Exists(filePath))
{
File.Delete(filePath);
} //if
if (fileUri.Scheme == Uri.UriSchemeHttp)
{
_state = new HttpWebRequestState(BUFFER_SIZE);
_state.request = WebRequest.Create(fileUri);
}
else if (fileUri.Scheme == Uri.UriSchemeFtp)
{
var args = new FtpСredentialsNeedEventArgs();
RiseFtpСredentialsNeed(args);
_state = new FtpWebRequestState(BUFFER_SIZE);
_state.request = FtpWebRequest.Create(fileUri);
_state.request.Credentials = new NetworkCredential(args.Login, args.Password);
// Set FTP-specific stuff
((FtpWebRequest)_state.request).KeepAlive = false;
//Проверка на существование системного proxy
var systemProxy = WebRequest.GetSystemWebProxy();
if (systemProxy.IsBypassed(new Uri(url)))
{
// First thing we do is get file size. 2nd step, done later,
// will be to download actual file.
_state.request.Method = WebRequestMethods.Ftp.GetFileSize;
_state.FtpMethod = WebRequestMethods.Ftp.GetFileSize;
}
else
{
_state.request.Method = WebRequestMethods.Ftp.DownloadFile;
_state.FtpMethod = WebRequestMethods.Ftp.DownloadFile;
} //else
}
else
{
throw new Exception("Ошибочная схема: " + fileUri.Scheme);
} //else
_state.FileUri = fileUri;
_state.TransferStart = DateTime.Now;
// Start the asynchronous request.
_state.request.BeginGetResponse(RespCallback, null);
}