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FtpWebResponse.ContentLength Property

Gets the length of the data received from the FTP server.

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

public override long ContentLength { get; }

Property Value

Type: System.Int64
An Int64 value that contains the number of bytes of data received from the FTP server.

When a response stream is returned by the FTP server, the ContentLength property contains the number of bytes in the stream. ContentLength returns −1 if no data was returned in the response or if the server did not send content length information. The return value is greater than or equal to zero if data was or should have been returned. For example, for requests that use the ListDirectory field, the ContentLength property always returns −1. For requests that use the UploadFile method, the ContentLength property is always zero. For requests that use the DownloadFile method, the property is greater than zero if the downloaded file contained data and is zero if it was empty.

For requests that use the GetFileSize method, ContentLength returns the size of the specified file on the server.

The following code example downloads a file from on the specified FTP server. This property contains the number of bytes in the downloaded file.

public static bool DownloadFileFromServer(Uri serverUri, string localFileName)
{
    // The serverUri parameter should start with the ftp:// scheme. 
    if (serverUri.Scheme != Uri.UriSchemeFtp)
    {
        return false;
    }
    // Get the object used to communicate with the server. 
    // Note that the cast to FtpWebRequest is done only 
    // for the purposes of illustration. If your application 
    // does not set any properties other than those defined in the 
    // System.Net.WebRequest class, you can use the following line instead: 
    // WebRequest request = WebRequest.Create(serverUri); 
    //
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri);
    request.Method = WebRequestMethods.Ftp.DownloadFile;

    FtpWebResponse response = (FtpWebResponse) request.GetResponse();

    Stream responseStream = null;
    StreamReader readStream = null;
    StreamWriter writeStream = null;
    try
    {
        responseStream = response.GetResponseStream(); 
        readStream = new StreamReader(responseStream, System.Text.Encoding.UTF8);
        // Display information about the data received from the server.
        Console.WriteLine("Bytes received: {0}",response.ContentLength);   

        Console.WriteLine("Message from server: {0}", response.StatusDescription);
        Console.WriteLine("Resource: {0}", response.ResponseUri);

        // Write the bytes received from the server to the local file. 
        if (readStream != null)
        {
            writeStream = new StreamWriter(localFileName, false);
            writeStream.Write(readStream.ReadToEnd());
        }
    }
    finally
    {
        if (readStream != null)
        {
            readStream.Close();
        }
        if (response != null)
        {
            response.Close();
        }
        if (writeStream != null)
        {
            writeStream.Close();
        }
    }
    return true;
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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