Inject new xml using BeforeSendRequest from IClientMessageInspector

Question

I would like to "inject" a custom XML text using BeforeSendRequest method from IClientMessageInspector. Here is the code I tried:

public object BeforeSendRequest(ref Message request, IClientChannel channel)
{       
    String myXML = "somexmlcontent";
    XmlDocument doc = new XmlDocument();
    doc.LoadXml(myXML);
    var ms = new MemoryStream();
    XmlDictionaryWriter writer = XmlDictionaryWriter.CreateTextWriter(ms);
    doc.WriteTo(writer);
    writer.Flush();
    ms.Position = 0;
    XmlDictionaryReader reader = XmlDictionaryReader.CreateTextReader(ms, XmlDictionaryReaderQuotas.Max);
    Message newReply = Message.CreateMessage(reader, int.MaxValue, request.Version);
    request = newReply;

    return null;
}

But it does return me the error "Unrecognized message version".

Answer 1

Make a copy of message prior to manipulate:

MessageBuffer buffer = request.CreateBufferedCopy(Int32.MaxValue);
request = buffer.CreateMessage();
Message message = buffer.CreateMessage();

Then create the new message based on your xml:

request = Message.CreateMessage(reader, int.MaxValue, message.Version);

You can also create the new massage setting the version from original request object:

Message newReply = Message.CreateMessage(reader, int.MaxValue, request.Version);
request = newReply;

Hope it helps