Simple Object Content

SimpleObjectContent.cs

    public class SimpleObjectContent<T> : HttpContent
    {
        private readonly T _outboundInstance;
        private readonly HttpContent _inboundContent;
        private readonly MediaTypeFormatter _formatter;

        // Outbound constructor
        public SimpleObjectContent(T outboundInstance, MediaTypeFormatter formatter)
        {
            _outboundInstance = outboundInstance;
            _formatter = formatter;
        }

        //Inbound constructor
        public SimpleObjectContent(HttpContent inboundContent, MediaTypeFormatter formatter)
        {
            _inboundContent = inboundContent;
            _formatter = formatter;
        }

        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
        {
            // FormatterContext is required by XmlMediaTypeFormatter, but is not used by WriteToStreamAsync of XmlMediaTypeFormatter!
            return _formatter.WriteToStreamAsync(typeof (T), _outboundInstance, stream, this.Headers, new FormatterContext(new MediaTypeHeaderValue("application/bogus"), false), null);
        }

        public Task<T> ReadAsync()
        {
            return this.ReadAsStreamAsync()
                .ContinueWith<object>(streamTask => _formatter.ReadFromStreamAsync(typeof(T), streamTask.Result, _inboundContent.Headers, new FormatterContext(new MediaTypeHeaderValue("application/bogus"), false)))
                .ContinueWith<T>(objectTask => (T)((Task<object>)(objectTask.Result)).Result);
        }

        
        protected override Task<Stream> CreateContentReadStreamAsync()
        {
            return _inboundContent.ReadAsStreamAsync();
        }

        protected override bool TryComputeLength(out long length)
        {
            length =-1L;
            return false;
        }
    }

Why don't you pass the TransportContext through to formatter.WriteToStreamAsync?