wcf stream 不知道长度的情况下，读取stream

http://bbs.csdn.net/topics/360163784

            string filepath = @"http://ww4.sinaimg.cn/thumbnail/6741e029jw1dfzrlqr07kj.jpg";
            Stream stream = WebRequest.Create(filepath).GetResponse().GetResponseStream();

            int size = 1024;
            int read = 0;
            MemoryStream ms = new MemoryStream();
            byte[] buffer = new byte[size];
            do
            {
                buffer = new byte[size];
                read = stream.Read(buffer, 0, size);
                ms.Write(buffer, 0, read); 
            } while (read > 0);
             
            Console.WriteLine(ms.Length.ToString());

或者：

        private void CopyStream(Stream instream, Stream outstream)
        {
            const int bufferLen = 4096;
            byte[] buffer = new byte[bufferLen];
            int count = 0;
            while ((count = instream.Read(buffer, 0, bufferLen)) > 0)
            {
                outstream.Write(buffer, 0, count);
            }
        }

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