Hi Alex-Alex-Alex-,
You can expose one Service operation to let WCF client to report downloading event to implement your requirement.
Please let me know what you mean "Can I activate MTOM encoding on the fly on client demand". Commonly when you configure MTOM in one endpoint of WCF service, the client also will use this encoder to communicate with the service.
Best regards,
Riquel
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Welcome to the All-In-One Code Framework! If you have any feedback, please tell us.