Parse/deserialize MTOM/XOP Data .NET

c#, deserialization, mtom, wcf, xml

Solution

You can deserialize the response using the WCF classes, as I'll show below. But before we proceed, this MTOM is invalid - the parameter `boundary` of the `Content-Type` header is malformed. Since it contains the '?' character, it needs to be quoted (look at the MIME RFC, section 5.1, definition of `token`).

Now, to deserialize it, you need to open the document with a MTOM reader - and `XmlDictionaryReader.CreateMtomReader` will give you exactly that. With that reader created, you can pass it to the `DataContractSerializer` to deserialize the object. The code below shows how this can be done.

    public class StackOverflow_10531128
    {
        const string MTOM = @"MIME-Version: 1.0
Content-Type: Multipart/Related;boundary=DeltaSync91ABCB4AF5D24B8F988B77ED7A19733D?MTOM;
    type=""application/xop+xml"";
    start=""<DeltaSyncMTOMFetchResponse@mail.services.live.com>"";

--DeltaSync91ABCB4AF5D24B8F988B77ED7A19733D?MTOM
content-transfer-encoding: binary
Content-Type: application/xop+xml; charset=utf-8; type=""application/xop+xml""
content-id: <DeltaSyncMTOMFetchResponse@mail.services.live.com>

<ItemOperations xmlns:xop=""http://www.w3.org/2004/08/xop/include"" xmlns:B=""HMMAIL:"" xmlns:D=""HMSYNC:"" xmlns=""ItemOperations:"">
    <Status>1</Status>
    <Responses>
        <Fetch>
            <ServerId>E631966A-9439-11E1-8E7B-00215AD9A7B8</ServerId>
            <Status>1</Status>
            <Message><xop:Include href=""cid:1.634715231374437235@example.org"" /></Message>
        </Fetch>
    </Responses>
</ItemOperations>
--DeltaSync91ABCB4AF5D24B8F988B77ED7A19733D?MTOM
content-transfer-encoding: binary
Content-Type: application/octet-stream
content-id: <1.634715231374437235@example.org>

this is a binary content; it could be anything but for simplicity I'm using text
--DeltaSync91ABCB4AF5D24B8F988B77ED7A19733D?MTOM--";

        [DataContract(Name = "ItemOperations", Namespace = "ItemOperations:")]
        public class ItemOperations
        {
            [DataMember(Order = 1)]
            public int Status { get; set; }
            [DataMember(Order = 2)]
            public Responses Responses { get; set; }
        }

        [CollectionDataContract(Name = "Responses", Namespace = "ItemOperations:", ItemName = "Fetch")]
        public class Responses : List<Fetch>
        {
        }

        [DataContract(Name = "Fetch", Namespace = "ItemOperations:")]
        public class Fetch
        {
            [DataMember(Order = 1)]
            public Guid ServerId { get; set; }
            [DataMember(Order = 2)]
            public int Status { get; set; }
            [DataMember(Order = 3)]
            public byte[] Message { get; set; }
        }

        public static void Test()
        {
            MemoryStream ms;
            ItemOperations obj;
            DataContractSerializer dcs = new DataContractSerializer(typeof(ItemOperations));

            string fixedMtom = MTOM.Replace(
                "Multipart/Related;boundary=DeltaSync91ABCB4AF5D24B8F988B77ED7A19733D?MTOM;",
                "Multipart/Related;boundary=\"DeltaSync91ABCB4AF5D24B8F988B77ED7A19733D?MTOM\";");
            ms = new MemoryStream(Encoding.UTF8.GetBytes(fixedMtom));
            XmlDictionaryReader reader = XmlDictionaryReader.CreateMtomReader(ms, Encoding.UTF8, XmlDictionaryReaderQuotas.Max);
            obj = (ItemOperations)dcs.ReadObject(reader);
            Console.WriteLine(obj.Status);
            Console.WriteLine(obj.Responses.Count);
            foreach (var resp in obj.Responses)
            {
                Console.WriteLine("  {0}", resp.ServerId);
                Console.WriteLine("  {0}", resp.Status);
                Console.WriteLine("  {0}", string.Join(" ", resp.Message.Select(b => string.Format("{0:X2}", (int)b))));
            }
        }
    }

Problem

Original source