topic Re: Select from NALayer in ArcObjects SDK Questions

Select from NALayer

AysberqTundra — Sat, 28 Dec 2013 11:49:39 GMT

Hello.

I want to select a feature from Network Analysis layer. I have the result (naLayer), which is solution of some Network Analysis problem. But when I cast naLayer as IfeatureLayer I get NULL.

Can anyone help me to solve this problem?

 SelectByAttributeQuery(naLayer as IfeatureLayer, "myQuery", true);   public void SelectByAttributeQuery(IFeatureLayer featureLayer,String whereClause,bool justOne) {     IMap m_map = axMapControl.Map;     if (m_map.SelectionCount > 0) m_map.ClearSelection();     IFeatureSelection featureSelection = featureLayer as IFeatureSelection;     IQueryFilter queryFilter = new QueryFilterClass();     queryFilter.WhereClause = whereClause;     featureSelection.SelectFeatures(queryFilter,esriSelectionResultEnum.esriSelectionResultNew,justOne);      axMapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null); }

Re: Select from NALayer

SanajyJadhav — Sun, 12 Dec 2021 00:39:26 GMT

So, do you get false when you execute following line?

if ( naLayer is IFeatureLayer) 
{

}

Re: Select from NALayer

SanajyJadhav — Sun, 29 Dec 2013 12:04:52 GMT

INALayer is implemented by NALayerClass class. This class also implements ILayer and other interfaces but not IFeatureLayer. This could be the reason.

Can you try to get ILayer from INALayer and then IFeatureLayer from ILayer?

HTH.

Re: Select from NALayer

AysberqTundra — Sun, 29 Dec 2013 13:44:57 GMT

Sanjay, many thanks for your reply.
I can get ILayer from INALayer, but when I try get IFeatureLayer from that ILayer I get NULL.

But I solved this problem using following way:

     IFeatureClass routesFeatureClass = m_NAContext.NAClasses.get_ItemByName("Routes") as IFeatureClass;      IFeatureLayer routesFeatureLayer = new FeatureLayerClass();      routesFeatureLayer.FeatureClass = routesFeatureClass;      axMapControl.AddLayer(routesFeatureLayer as ILayer, 0);      SelectByAttributeQuery(routesFeatureLayer, "myWhereClause", true);

Re: Select from NALayer

SanajyJadhav — Mon, 30 Dec 2013 03:34:36 GMT

Glad your issue is fixed and thanks for posting the solution.