Sometimes the Prism Application may need the hierarchical event aggregator. In this post, I want to share my implementation of HierarchicEventAggregator.

IHierarchicEventAggregator.cs
HierarchicEventAggregator.cs

1. To create the instances, do the following:
IHierarchicEventAggregator root = new HierarchicEventAggregator();
IHierarchicEventAggregator workspace1 = root.CreateChildHierarchicEventAggregator();
IHierarchicEventAggregator workspace2 = root.CreateChildHierarchicEventAggregator();

2. To publish the event locally, do the following:
workspace2.PublishToLocalSubscribers<TabClosedEvent, TabClosedEventArgs>(new TabClosedEventArgs() { });

3. To publish the event for each hierarchic level, do the following:
workspace1.PublishToAllSubscribers<TabClosedEvent, TabClosedEventArgs>(new TabClosedEventArgs() { });

I hope this has been useful to you!

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