WCF, how to self-host callback?

Question

I have a WCF service lib which run by a self-host [Winform] and a client [Winform], and im using NetTcpBinding.

i want the client to call a method from WCF service to Pop up a MessageBox on Self-host Winform.
the point : i want to send an image to the server side, and it should appears in a new form, but i can't communicate between WCF service library and its Self-Host Form.

please can you help with an example that shows me how would i show a messageBox on Self-host winform when a client call a method from WCF service lib.

Answer 1

You could create your service as a singleton and pass in the Form in its constructor. Then pass this service object into the ServiceBase.

Then when you get a function call you will have reference to the Form and can manipulate it in that fashion. Be aware of threading restriction on working with Form applications.

Answer 2

You can return a success or failure message from the service call which sends the image to the server side. Assuming that you were successful in sending the message to server, you can open a new form and populate the message box or whatever user interface control you wish o display to the user. As I mentioned in the comment, the service colud be multitenanted and you should not mix user interface relatd code in service layer.