FtpWebRequest.Abort Yöntem

Tanım

Ad Alanı:

System.Net

Bütünleştirilmiş Kod:

System.Net.Requests.dll

Kaynak:

FtpWebRequest.cs

Zaman uyumsuz bir FTP işlemini sonlandırır.

public:
 override void Abort();

public override void Abort ();

override this.Abort : unit -> unit

Public Overrides Sub Abort ()

Örnekler

Aşağıdaki kod örneği, kullanıcının yerel dizinden sunucuya bir dosyanın zaman uyumsuz yüklemesini nasıl sonlandırabileceğini gösterir.

public:
   void AbortUpload( String^ fileName, String^ serverUri )
   {
      request = dynamic_cast<FtpWebRequest^>(WebRequest::Create( serverUri ));
      request->Method = WebRequestMethods::Ftp::UploadFile;

      // Get the file to be uploaded and convert it to bytes.
      StreamReader^ sourceStream = gcnew StreamReader( fileName );
      fileContents = Encoding::UTF8->GetBytes( sourceStream->ReadToEnd() );
      sourceStream->Close();

      // Set the content length to the number of bytes in the file.
      request->ContentLength = fileContents->Length;

      // Asynchronously get the stream for the file contents.
      IAsyncResult^ ar = request->BeginGetRequestStream( gcnew AsyncCallback( this, &AsynchronousFtpUpLoader::EndGetStreamCallback ), nullptr );
      Console::WriteLine( "Getting the request stream asynchronously..." );
      Console::WriteLine( "Press 'a' to abort the upload or any other key to continue" );
      String^ input = Console::ReadLine();
      if ( input->Equals( "a" ) )
      {
         request->Abort();
         Console::WriteLine( "Request aborted" );
         return;
      }
   }

public class ApplicationMain
{
    public static void Main()
    {
          ManualResetEvent wait = new ManualResetEvent(false);
          AsynchronousFtpUpLoader uploader = new AsynchronousFtpUpLoader(wait);
          uploader.AllowAbortUpload("out.txt", "ftp://sharriso1/ftptests.txt");
          wait.WaitOne();
          if (uploader.AsyncException != null)
          {
                Console.WriteLine(uploader.AsyncException.ToString());
          }
    }
}
    public class AsynchronousFtpUpLoader
    {
        ManualResetEvent wait;
        FtpWebRequest request;
        byte [] fileContents;
        Exception asyncException = null;

        public AsynchronousFtpUpLoader(ManualResetEvent wait)
        {
            this.wait = wait;
        }

        public Exception AsyncException
        {
            get { return asyncException;}
        }

        private void EndGetStreamCallback(IAsyncResult ar)
        {
            Stream requestStream = null;
            // End the asynchronous call to get the request stream.
            try
            {
                requestStream = request.EndGetRequestStream(ar);
            }
            // Return exceptions to the main application thread.
            catch (Exception e)
            {
                Console.WriteLine("Could not get the request stream.");
                asyncException = e;
                wait.Set();
                return;
            }
            // Write the file contents to the request stream.
            requestStream.Write(fileContents, 0, fileContents.Length);
            Console.WriteLine ("Writing {0} bytes to the stream.", fileContents.Length);
            // IMPORTANT: Close the request stream before sending the request.
            requestStream.Close();
        }

        // The EndGetResponseCallback method
        // completes a call to BeginGetResponse.
        private void EndGetResponseCallback(IAsyncResult ar)
        {
            FtpWebResponse response = null;
            try
            {
                response = (FtpWebResponse) request.EndGetResponse(ar);
            }
            // Return exceptions to the main application thread.
            catch (Exception e)
            {
                Console.WriteLine ("Error getting response.");
                asyncException = e;
                wait.Set();
            }
            Console.WriteLine("Upload status: {0}",response.StatusDescription);
            // Signal the application thread that this operation is complete.
            wait.Set();
        }
        internal void AbortRequest(FtpWebRequest request)
        {
            request.Abort();
            Console.WriteLine("Request aborted!");
            wait.Set();
        }

       public void AllowAbortUpload(string fileName, string serverUri)
       {
            request = (FtpWebRequest)WebRequest.Create(serverUri);
            request.Method = WebRequestMethods.Ftp.UploadFile;
            // Get the file to be uploaded and convert it to bytes.
            StreamReader sourceStream = new StreamReader(fileName);
            fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
            sourceStream.Close();
            // Set the content length to the number of bytes in the file.
            request.ContentLength = fileContents.Length;
            // Asynchronously get the stream for the file contents.
            IAsyncResult ar = request.BeginGetRequestStream(
                new AsyncCallback (EndGetStreamCallback), null);
             while (!ar.IsCompleted)
            {
                Console.WriteLine("Press 'a' to abort writing to the request stream. Press any other key to continue...");
                string input = Console.ReadLine();
                if (input == "a")
                {
                    AbortRequest(request);
                    return;
                }
            }
            Console.WriteLine("Sending the request asynchronously...");
            IAsyncResult responseAR = request.BeginGetResponse(
                new AsyncCallback (EndGetResponseCallback), null);

            while (!responseAR.IsCompleted)
            {
                Console.WriteLine("Press 'a' to abort the upload. Press any other key to continue.");
                string input = Console.ReadLine();
                if (input == "a")
                {
                    AbortRequest(request);
                    return;
                }
            }
        }

Açıklamalar

Devam eden bir işlem yoksa, bu yöntem hiçbir şey yapmaz. Bir dosya aktarımı devam ederse, bu yöntem aktarımı sonlandırır.

Not

Uygulamanızda ağ izlemeyi etkinleştirdiğinizde, bu üye izleme bilgilerini çıkarır. Daha fazla bilgi için bkz. .NET Framework'te Ağ İzleme.

Ayrıca bkz.

• FtpWebResponse
• FtpStatusCode
• WebRequestMethods.Ftp
• WebRequest
• WebResponse
• WebClient