Stream.Length throws NotSupportedException

Question

I am getting a error when attempting stream.Length on a Stream object sent into my WCF method.

Unhandled Exception!
 Error ID: 0
 Error Code: Unknown
 Is War         


        

Answer 1

This is what I do:

    // Return the length of a stream that does not have a usable Length property
    public static long GetStreamLength(Stream stream)
    {
        long originalPosition = 0;
        long totalBytesRead = 0;

        if (stream.CanSeek)
        {
            originalPosition = stream.Position;
            stream.Position = 0;
        }

        try
        {
            byte[] readBuffer = new byte[4096];

            int bytesRead;

            while ((bytesRead = stream.Read(readBuffer, 0, 4096)) > 0)
            {
                totalBytesRead += bytesRead;
            }

        }
        finally
        {
            if (stream.CanSeek)
            {
                stream.Position = originalPosition;
            }
        }

        return totalBytesRead;
    }