FtpWebRequest.GetRequestStream Method
Definition
Important
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Retrieves the stream used to upload data to an FTP server.
public:
override System::IO::Stream ^ GetRequestStream();public override System.IO.Stream GetRequestStream ();override this.GetRequestStream : unit -> System.IO.StreamPublic Overrides Function GetRequestStream () As StreamReturns
A writable Stream instance used to store data to be sent to the server by the current request.
Exceptions
BeginGetRequestStream(AsyncCallback, Object) has been called and has not completed.
-or-
An HTTP proxy is enabled, and you attempted to use an FTP command other than DownloadFile, ListDirectory, or ListDirectoryDetails.
A connection to the FTP server could not be established.
The Method property is not set to UploadFile or AppendFile.
Examples
The following code example demonstrates copying a file to a request's data stream and sending a request to the server to upload the data and append it to a file.
static bool AppendFileOnServer( String^ fileName, Uri^ serverUri )
{
// The URI described by serverUri should use the ftp:// scheme.
// It contains the name of the file on the server.
// Example: ftp://contoso.com/someFile.txt.
// The fileName parameter identifies the file containing
// the data to be appended to the file on the server.
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::AppendFile;
StreamReader^ sourceStream = gcnew StreamReader( fileName );
array<Byte>^fileContents = Encoding::UTF8->GetBytes( sourceStream->ReadToEnd() );
sourceStream->Close();
request->ContentLength = fileContents->Length;
// This example assumes the FTP site uses anonymous logon.
request->Credentials = gcnew NetworkCredential( "anonymous","janeDoe@contoso.com" );
Stream^ requestStream = request->GetRequestStream();
requestStream->Write( fileContents, 0, fileContents->Length );
requestStream->Close();
FtpWebResponse^ response = dynamic_cast<FtpWebResponse^>(request->GetResponse());
Console::WriteLine( "Append status: {0}", response->StatusDescription );
response->Close();
return true;
}
public static bool AppendFileOnServer(string fileName, Uri serverUri)
{
// The URI described by serverUri should use the ftp:// scheme.
// It contains the name of the file on the server.
// Example: ftp://contoso.com/someFile.txt.
// The fileName parameter identifies the file containing
// the data to be appended to the file on the server.
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.AppendFile;
StreamReader sourceStream = new StreamReader(fileName);
byte [] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential ("anonymous","janeDoe@contoso.com");
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse) request.GetResponse();
Console.WriteLine("Append status: {0}",response.StatusDescription);
response.Close();
return true;
}
Remarks
Set the request properties before calling the GetRequestStream method. After writing the data to the stream, you must close the stream prior to sending the request.
If you have not set the Method property to UploadFile or AppendFile, you cannot get the stream.
GetRequestStream blocks while waiting for the stream. To prevent this, call the BeginGetRequestStream method in place of GetRequestStream.
Note
This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.
Notes to Callers
This method generates network traffic.
