WCF Custom encoder - Assigning message content type at runtime

Question

I'm currently building my own WCF Encoder that will parse my message. I want to dynamically change the content type that is assigned when I'm sending a reply but I can't get my head around where he is looking for it.

Is he using the CustomTextEncoder.ContentType or the content type of the innerencoder? How can I force him to send the response as "text/xml" or "application/soap+xml"?

Thank you in advance.

EDIT - Just to clarify that I need to the decision in the WriteMessage-method of my custom encoder. I'm using a string property that holds the requested content type but he's not doing it correctly.

public class MyEncoder : MessageEncoder
{
    private string _contentType = "application/soap+xml";

    public override string ContentType
    {
        get
        {
            return _contentType;
        }
    }

    public override ArraySegment<byte> WriteMessage(Message message, int maxMessageSize, BufferManager bufferManager, int messageOffset)
    {
        ...

        if (_MY_CONDITION_HERE_)
        {
            _contentType = "multipart/related";
        }
        else
            _contentType = "application/soap+xml";

        ...
     }
}

Unfortunately when I send my message he's still assigning the default value of my encoder...

Answer 1

It seems like can't change the content type of an inbound request, my problem was fixed by using a Message Inspector where I assign the content type that I want. (This link helped me)

Good to know - The ACKs from the encoder are not passing through the Message Inspector so it uses the ContentType-property.