Listen to ArcCatalog Events in .NET

Question

Hi All,

I would like listen to the ArcCatalog application event IGxApplicationEvents.OnViewChanged() in a Desktop 10.0 .NET extension, but how do I get this event? According to http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#//0001000002p3000000 I would expect:
using ESRI.ArcGIS.ArcCatalog;
using ESRI.ArcGIS.Catalog;
using ESRI.ArcGIS.CatalogUI;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Framework;
[...]

private void registerEvents(IGxApplication app)
        {
            IGxApplicationEvents_Event events = (IGxApplicationEvents_Event)app;
            events.OnViewChanged += this.onAppViewChanged;
        }

However, I cannot find an interface IGxApplicationEvents_Event. Am I missing something...? There is IGxApplicationEvents in ESRI.ArcGIS.CatalogUI, sure, but that doesn't seem to allow me to register an event, just to fire it.

FridjofSchmidt · Answer

IGxApplicationEvents_Event won't show up in intellisense, or anywhere else but it should still compile and work.

Hi Alex,

Unfortunately that's not the case. If I declare
        private ESRI.ArcGIS.ArcCatalog.IGxDocumentEvents_Event _docEvents;
        private ESRI.ArcGIS.CatalogUI.IGxApplicationEvents_Event _events;

the second line will cause a build failure, but the first line will not. Also, the IGxDocumentEvents_Event interface is shown by intellisense and marked green by Resharper, while the 2nd line is not shown and marked red. Also, I can see the IGxApplicationEvents interface in the CatalogUI library.

Did Esri forget to expose the outbound interface of IGxApplicationEvents??

AlexanderGray · Answer

IGxApplicationEvents_Event won't show up in intellisense, or any where else but it should still compile and work.  Some quirk of outbound interfaces I have been told.