How to send message from server to client using WCF Services?

Question

I am working on a project where the organization is using dashboard functionalities to see the statistics. To get the data for that dashboard, they are calling a service frequently with some particular time interval. I think that is not a correct approach, because there should be a way to send information from server to client when the new information is available. So, is there a way in WCF Services to send message from service to client instead of client request information from Service?

Answer 1

In order to do that, you need to create and mantain a list of all connected clients (the general practice to fo this is creating LogIn and LogOut methods to create and manage a list of object representing your clients incuding their CallbackContext). Then, with a System.Time.Timers, you can loop through the connected client list and send the notification.