ServiceStack.HttpResult.WritePartialTo C# (CSharp) Méthode

        public void WritePartialTo(IResponse response)
        {
            var contentLength = GetContentLength().GetValueOrDefault(int.MaxValue); //Safe as guarded by IsPartialRequest
            var rangeHeader = RequestContext.GetHeader(HttpHeaders.Range);

            long rangeStart, rangeEnd;
            rangeHeader.ExtractHttpRanges(contentLength, out rangeStart, out rangeEnd);

            if (rangeEnd > contentLength - 1)
                rangeEnd = contentLength - 1;

            response.AddHttpRangeResponseHeaders(rangeStart, rangeEnd, contentLength);

            var outputStream = response.OutputStream;
            if (FileInfo != null)
            {
                using (var fs = FileInfo.OpenRead())
                {
                    fs.WritePartialTo(outputStream, rangeStart, rangeEnd);
                }
            }
            else if (ResponseStream != null)
            {
                try
                {
                    ResponseStream.WritePartialTo(outputStream, rangeStart, rangeEnd);
                }
                finally
                {
                    DisposeStream();
                }
            }
            else if (ResponseText != null)
            {
                using (var ms = MemoryStreamFactory.GetStream(Encoding.UTF8.GetBytes(ResponseText)))
                {
                    ms.WritePartialTo(outputStream, rangeStart, rangeEnd);
                }
            }
            else
                throw new InvalidOperationException("Neither file, stream nor text were set when attempting to write to the Response Stream.");
        }