WCF Multipart Custom Class - android

I send a POST request from an Android App using the ION library. The request has some multipart parameters and an attachment file.
Something like this:
.setMultipartParameter("Message", message)
.setMultipartParameter("TextFileName", textFileName)
.setMultipartParameter("TextFileContentBase64Encoded", TextFileContentBase64Encoded)
.setMultipartFile("AttachementFile", fileName)
The problem is that server side(WCF), we have a custom class used for parsing this request that has a Stream for the attachment file, and 3 Strings for other parameters. From my understanding, WCF limits you. You can't parse a custom class that has a Stream and other parameters. You either have a Stream or you have other params.
The question is how can you parse a incoming request that has a stream and other parameters in WCF?
Thanks!

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#Multipart
#Post("/path")
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Regards.

According to this: https://github.com/square/retrofit/issues/2164 there is no elegant way to do it with Retrofit2.
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Forgive me as I'm new to API driven development. I'm doing a front-end and back-end at the same time and ran into a snag.
On the back-end I accept URL encoded token_id that you may post to create a sessions. Goes like
http://someip:3000/sessions/create?token_id=sometoken
and works.
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I understand that I can't URL encode a field (my token_id) and send a
body as JSON.
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#POST("/sessions/create")
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According to the android documentations, I should be using AndroidHttp.HttpTransport instead of Apache as Apache may not be supported in the future, etc. etc. Does anyone know how to use AndroidHttp for sending multipart data to server? I need to upload a video to server along with title, username, timestamp, etc. Thanks for any help.
With apache, the following code works well for uploading multipart video: Android upload video to remote server using HTTP multipart form data

Sending Image to server in android

In android I am trying to send image to the server.I am using Multipart request. But when I add image in format ByteArray to the Multipart UnsupportedEncodingException occurs.
following is my code.
Do I need to add mime type to request.
If possible please post the complete Sample code.

Try converting the Image to Base64 format string and then sending that string to the server.
Here's the link to convert image to base64 format.
And then at server end decode it.

I done it with the use of MultiPartEntity . Added image as byteArrayBody and done the HTTP request.

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