FtpWebRequest.EnableSsl Properti

Definisi

Ruang nama:

System.Net

Rakitan:

System.Net.Requests.dll

Sumber:

FtpWebRequest.cs

Mendapatkan atau mengatur Boolean yang menentukan bahwa koneksi SSL harus digunakan.

public:
 property bool EnableSsl { bool get(); void set(bool value); };

public bool EnableSsl { get; set; }

member this.EnableSsl : bool with get, set

Public Property EnableSsl As Boolean

Nilai Properti

Boolean

true jika kontrol dan transmisi data dienkripsi; jika tidak, false. Nilai defaultnya adalah false.

Pengecualian

InvalidOperationException

Koneksi ke server FTP telah dibuat.

Contoh

Contoh kode berikut menggunakan koneksi terenkripsi untuk mengunduh daftar direktori dari server FTP.

static bool ListFilesOnServerSsl( Uri^ serverUri )
{
   // The serverUri should start with the ftp:// scheme.
   if ( serverUri->Scheme != Uri::UriSchemeFtp )
   {
      return false;
   }

   // Get the object used to communicate with the server.
   FtpWebRequest^ request = dynamic_cast<FtpWebRequest^>(WebRequest::Create( serverUri ));
   request->Method = WebRequestMethods::Ftp::ListDirectory;
   request->EnableSsl = true;

   // Get the ServicePoint object used for this request, and limit it to one connection.
   // In a real-world application you might use the default number of connections (2),
   // or select a value that works best for your application.
   ServicePoint^ sp = request->ServicePoint;
   Console::WriteLine( "ServicePoint connections = {0}.", sp->ConnectionLimit );
   sp->ConnectionLimit = 1;
   FtpWebResponse^ response = dynamic_cast<FtpWebResponse^>(request->GetResponse());
   Console::WriteLine( "The content length is {0}", response->ContentLength );

   // The following streams are used to read the data returned from the server.
   Stream^ responseStream = nullptr;
   StreamReader^ readStream = nullptr;
   responseStream = response->GetResponseStream();
   readStream = gcnew StreamReader( responseStream,System::Text::Encoding::UTF8 );

   // Display the data received from the server.
   Console::WriteLine( readStream->ReadToEnd() );
   Console::WriteLine( "List status: {0}", response->StatusDescription );
   readStream->Close();
   response->Close();

   Console::WriteLine( "Banner message: {0}", response->BannerMessage );

   Console::WriteLine( "Welcome message: {0}", response->WelcomeMessage );

   Console::WriteLine( "Exit message: {0}", response->ExitMessage );

   return true;
}

public static bool ListFilesOnServerSsl(Uri serverUri)
{
    // The serverUri should start with the ftp:// scheme.
    if (serverUri.Scheme != Uri.UriSchemeFtp)
    {
        return false;
    }
    // Get the object used to communicate with the server.
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri);
    request.Method = WebRequestMethods.Ftp.ListDirectory;
    request.EnableSsl = true;

    // Get the ServicePoint object used for this request, and limit it to one connection.
    // In a real-world application you might use the default number of connections (2),
    // or select a value that works best for your application.

    ServicePoint sp = request.ServicePoint;
    Console.WriteLine("ServicePoint connections = {0}.", sp.ConnectionLimit);
    sp.ConnectionLimit = 1;

    FtpWebResponse response = (FtpWebResponse) request.GetResponse();
     Console.WriteLine("The content length is {0}", response.ContentLength);
    // The following streams are used to read the data returned from the server.
    Stream responseStream = null;
    StreamReader readStream = null;
    try
    {
        responseStream = response.GetResponseStream();
        readStream = new StreamReader(responseStream, System.Text.Encoding.UTF8);

        if (readStream != null)
        {
            // Display the data received from the server.
            Console.WriteLine(readStream.ReadToEnd());
        }
        Console.WriteLine("List status: {0}",response.StatusDescription);
    }
    finally
    {
        if (readStream != null)
        {
            readStream.Close();
        }
        if (response != null)
        {
            response.Close();
        }
    }

    Console.WriteLine("Banner message: {0}",
        response.BannerMessage);

    Console.WriteLine("Welcome message: {0}",
        response.WelcomeMessage);

    Console.WriteLine("Exit message: {0}",
        response.ExitMessage);
    return true;
}

Keterangan

Perhatian

EnableSsl Kecuali properti adalah true, semua data dan perintah, termasuk informasi nama pengguna dan kata sandi Anda, dikirim ke server dalam teks yang jelas. Siapa pun yang memantau lalu lintas jaringan dapat melihat mandat Anda dan menggunakannya untuk terhubung ke server. Jika Anda menyambungkan ke server FTP yang memerlukan kredensial dan mendukung SSL, Anda harus mengatur EnableSsl ke true.

Perintah "AUTH TLS" dikirim ke server untuk meminta sesi terenkripsi. Jika server tidak mengenali perintah ini, Anda akan menerima WebException pengecualian.

Lihat juga

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