prism 中 EventAggregator事件过滤(Subscription Filtering)

Subscription Filtering

Subscribers may not need to handle every instance of a published event. In these cases, the subscriber can subscribe and supply a delegate that filters the event before the registered handler is called. Frequently, this filter is supplied as a lambda expression, as shown in the following code.

C#Copy

FundAddedEvent fundAddedEvent = eventAggregator.GetEvent<FundAddedEvent>();

fundAddedEvent.Subscribe(FundAddedEventHandler, 
                         ThreadOption.UIThread, false,
                         fundOrder => fundOrder.CustomerId == _customerId);