topic Re: IRouteEventSource and RouteEventSource in ArcObjects SDK Questions

IRouteEventSource and RouteEventSource

ShaningYu — Wed, 25 Sep 2013 14:11:40 GMT

From this ArcObjects diagram at: http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#//003100000138000000, it can be seen that the RouteEventSource class has 2 interfaces, and one of the interfaces is the IRouteEventSource. However, in VS 2010 Object Browser, I can see that the IRouteEventSource contains dozens of methods and properties, but none of the methods and properties of the IRouteEventSource is displayed in the RouteEventSource class. Can someone explain this?
Besides, I want to create a RouteEventSource object, how can it implement the IRouteEventSource?
Thanks.

Re: IRouteEventSource and RouteEventSource

ShaningYu — Wed, 25 Sep 2013 18:16:06 GMT

I need to make a correction here - In VS 2010 Object Browser, it shows that Both the IRouteEventSource and RouteEventSource are interfaces. However, in ESRI's Exploring ArcObjects (Vol. 1, p967), it states that RouteEventSource is s sub-class of a feature class, which means it can be used anywhere a feature class can be. I have created another thread to mention this issue (http://forums.arcgis.com/threads/93431-Subclass-RouteEventSource?p=331925#post331925).
The RouteEventSource has 2 interfaces, one of which is the IRouteEventSource.   The IRouteEventSource has the Property: RouteLocator.
To get the RouteLocator property, I tried this piece of code below,
            ESRI.ArcGIS.Location.RouteEventSource rteEventSource;   // RouteEventSource - an interface, contains IDataset only
            rteEventSource = (ESRI.ArcGIS.Location.RouteEventSource)fClass; // fClass is a FeatureClass
            ESRI.ArcGIS.Location.IRouteEventSource rteEventSource2 = (ESRI.ArcGIS.Location.IRouteEventSource)rteEventSource;
but got error on the last line of the code with InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to interface type 'ESRI.ArcGIS.Location.IRouteEventSource'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{641755F0-B7DE-11D3-9F7C-00C04F6BDF06}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

Re: IRouteEventSource and RouteEventSource

ShaningYu — Thu, 26 Sep 2013 14:40:26 GMT

Should see the RouteEventSourceClass rather than the RouteEventSource in VS Object Browser. Thread is to be closed.