/// <summary>
/// Ends a pending asynchronous operation started with <see cref="BeginGetResponse"/>.
/// </summary>
/// <param name="asyncResult">The <see cref="IAsyncResult"/> that was returned when the operation started.</param>
/// <returns>A <see cref="WebResponse"/> reference that contains an <see cref="FtpWebResponse"/> instance.
/// This object contains the FTP server's response to the request.</returns>
public override WebResponse EndGetResponse(IAsyncResult asyncResult)
{
if (asyncResult == null)
{
throw new ArgumentNullException("asyncResult");
}
FtpAsyncResult far = (FtpAsyncResult)asyncResult;
if (far.IsCompleted)
{
if (response == null)
{
throw new WebException(Properties.Resources.net_could_not_connect, WebExceptionStatus.ConnectFailure);
}
return(this.response);
}
//wait till operation finished
far.AsyncWaitHandle.WaitOne();
//mark as synchronous completion
far.completedSynchronously = true;
far.isCompleted = true;
if (response == null)
{
throw new WebException(Properties.Resources.net_could_not_connect, WebExceptionStatus.ConnectFailure);
}
return(this.response);
}
/// <summary>
/// Begins sending a request and receiving a response from an FTP server asynchronously.
/// </summary>
/// <param name="callback">An <see cref="AsyncCallback"/> delegate that references the method to invoke when the operation is complete.</param>
/// <param name="state">A user-defined object that contains information about the operation.
/// This object is passed to the callback delegate when the operation completes.</param>
/// <returns>An <see cref="IAsyncResult"/> instance that indicates the status of the operation.</returns>
public override IAsyncResult BeginGetResponse(AsyncCallback callback, object state)
{
if (gettingResponse)
{
throw new InvalidOperationException();
}
gettingResponse = true;
asyncResult = new FtpAsyncResult(this, state, callback);
System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(GetResponseThread), asyncResult);
//System.Threading.Thread t = new System.Threading.Thread(new System.Threading.ThreadStart(GetResponseThread));
//t.IsBackground = true;
//t.Start();
return(asyncResult);
}
