Eventaggregator event subscription and release in Prism

Eventaggregator is a tool for managing events easily.

1. Define a class that inherits from Compositepresentationevent<t>. This class is used to define different events, their parameters, and how they are handled

 Public class getinputmessages:compositepresentationevent<string>{}

2. Create an instance of Eventagregator and ensure that the instance is unique to manage events

     Public classEventaggregatorrepository { Publiceventaggregatorrepository () {Eventaggregator=NewEventaggregator (); }         PublicIeventaggregator Eventaggregator;  Public StaticEventaggregatorrepository eventrepository =NULL; //Singleton, keeping memory unique instances         Public Staticeventaggregatorrepository getinstance () {if(Eventrepository = =NULL) {eventrepository=Neweventaggregatorrepository (); }            returneventrepository; }    }

Create Eventaggregator

3. Subscribe to Events (define how events are handled)

Eventaggregatorrepository.getinstance () .eventaggregator.getevent<getinputmessages> (). Subscribe (Receivemessage,threadoption.uithread,true); // Event Handling Methods  Public void ReceiveMessage (string  messagedata) {     this. txtresult.text = messagedata;} 

Subscribe Events

4. Publish events (invoke event handling)

Eventaggregatorrepository.getinstance () .eventaggregator.getevent<getinputmessages> (). Publish (MessageData);

Publish Events

The implementation mechanism and the delegate (Delegate) are very similar, and the individual believes that such eventaggregator exist only to make the logic clearer. His advantage is that if the processing method is consistent, you can trigger such an event on multiple pages

Eventaggregator event subscription and release in Prism