GetRequestStream Method
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FtpWebRequest.GetRequestStream Method ()

 

Retrieves the stream used to upload data to an FTP server.

Namespace:   System.Net
Assembly:  System (in System.dll)

public override Stream GetRequestStream()

Return Value

Type: System.IO.Stream

A writable Stream instance used to store data to be sent to the server by the current request.

Exception Condition
InvalidOperationException

BeginGetRequestStream has been called and has not completed.

- or -

An HTTP proxy is enabled, and you attempted to use an FTP command other than WebRequestMethods.Ftp.DownloadFile, WebRequestMethods.Ftp.ListDirectory, or WebRequestMethods.Ftp.ListDirectoryDetails.

WebException

A connection to the FTP server could not be established.

ProtocolViolationException

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.

System_CAPS_noteNote

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.

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.

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;
}

.NET Framework
Available since 2.0
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