Question

I have a WPF Prism Application with e.g. several Customers i want to edit. So i have 5 Tabs for 5 customers for example.
Each customer has 5 subtabs, like setting, details etc.

When I load a Customer or update it I want a prism event published to every subtab gets updated.
The only problem is: the other subtabs will get updated with the same customer aswell… which is not the plan 😀

So is it possible that only the active tab and those viewmodels can subscribe to the event, or something like this?

Thanks for help!

Answer 1

I did something like this a while back

I can’t remember exact details, however the tabs subscribed to events with a LoadConsumerMessage, and the message had two extra properties in addition to the usual message properties: a Id field and an IsHandled field.

If I wanted a specific tab to load the consumer, I’d populate the Id with the id of the tab I wanted. For example, to load a Customer in the current tab I’d use

// Id was typically a Guid
var event = new LoadConsumerEvent() { Id = this.Id; };

Then in the subscribers that process the event, I’d ignore the event if it didn’t match

if (e.Id == Guid.Empty || e.Id == this.Id)
{
    // Load Customer
}

If I wanted only the first available tab to handle the event, I’d set the IsHandled property in the first subscriber, and ignore the event if it was ever true

if (e.IsHandled)
    return;

// Do processing

e.IsHandled = true;