FtpWebResponse.GetResponseStream 方法

定义

命名空间:

System.Net

程序集:

System.Net.Requests.dll

Source:

FtpWebResponse.cs

检索包含从 FTP 服务器上发送的响应数据的流。

public:
 override System::IO::Stream ^ GetResponseStream();

public override System.IO.Stream GetResponseStream ();

override this.GetResponseStream : unit -> System.IO.Stream

Public Overrides Function GetResponseStream () As Stream

返回

Stream

可读取的 Stream 实例，它包含与响应一起返回的数据；如果服务器未返回任何响应数据，则为 Null。

例外

InvalidOperationException

响应未返回数据流。

示例

下面的代码示例演示如何获取请求的 ListDirectory 响应流。

static bool ListFilesOnServer( 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;

   // 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());

   // The following streams are used to read the data returned from the server.
   Stream^ responseStream = nullptr;
   StreamReader^ readStream = nullptr;
   try
   {
      responseStream = response->GetResponseStream();
      readStream = gcnew StreamReader( responseStream,System::Text::Encoding::UTF8 );
      if ( readStream != nullptr )
      {
         // Display the data received from the server.
         Console::WriteLine( readStream->ReadToEnd() );
      }

      Console::WriteLine( "List status: {0}", response->StatusDescription );
   }
   finally
   {
      if ( readStream != nullptr )
      {
         readStream->Close();
      }

      if ( response != nullptr )
      {
         response->Close();
      }
   }

   return true;
}

public static bool ListFilesOnServer(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;

    // 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();

    // 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();
        }
    }

    return true;
}

注解

读取数据后，必须关闭流。 关闭包含流的对象时， FtpWebResponse 将自动关闭该流。

除非请求方法是 DownloadFile 或 ListDirectory，否则将引发异常。

另请参阅

• FtpWebRequest
• FtpStatusCode
• WebRequestMethods.Ftp
• WebRequest
• WebResponse
• WebClient
• Close()