Latest Contributions by DavidStefan

I am developing a simple add-in that will trigger an action after user selects features on the map. The action will essentially make sure a dockable window is open and in that window display information about the selected features. I have implemented a simple function that loops over selected features using IEnumFeature and collects their OIDs. To make sure the OIDs are present for all features in the selection, I set the IEnumFeatureSetup.AllFields = true. Now to the problem. After I've selected a number features several times (regardless of what features or how many I select), the SelectionChanged event stops from being fired. It appears as if the add-in has crashed, but no error message is displayed. This happens both in debug and production. If I try to restart the add-in by de-selecting it in the Customise->Extensions menu, I can no longer select it back. However, ArcMap works fine otherwise. To make the add-in work again I must restart ArcMap. I have done some naive memory usage inspection using Task Manager. Memory usage raises as I keep re-selecting features. Is this a memory leak? I am releasing the IEnum reference so this should, at least in theory, not be a problem. The features are pulled from a file geodatabase. They have 5 short text fields each and there is around 1300 of them. The more features I select at once, the sooner the add-in stops working (e.g. if I select all of the features in the map at once, the SelectionChanged event won't be fired again). I am developing in Arcobjects 10.1 SDK with Visual Studio 10 for C# Express using .NET 3.5. I cannot upgrade nor can I use .NET 4.0 due to client constraints. The add-in is being tested in ArcMap 10.1. using System; using System.Collections.Generic; using System.Diagnostics; using System.Text; using System.IO; using System.Collections; using ESRI.ArcGIS.Framework; using ESRI.ArcGIS.esriSystem; using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.Desktop.AddIns; using ESRI.ArcGIS.Geodatabase; using ESRI.ArcGIS.Geometry; using System.Runtime.InteropServices; namespace DfT.Maritime.DeepPort {     public class DeepPortExtension: ESRI.ArcGIS.Desktop.AddIns.Extension {         private static IActiveViewEvents_Event ViewEvents {             get { return ArcMap.Document.ActiveView as IActiveViewEvents_Event; }         }         public DeepPortExtension() {         }         protected override void OnStartup() {         }         protected override bool OnSetState(ExtensionState state) {             Init();             return base.OnSetState(state);         }         private void Init() {             if (ArcMap.Document.ActiveView.IsActive()) {                 InitAddin();             } else {                 ArcMap.Events.OpenDocument += delegate() {                     InitAddin();                 };                 ArcMap.Events.NewDocument += delegate() {                     InitAddin();                 };             }         }         private void InitAddin() {             // Bind selection changed handler             ViewEvents.SelectionChanged += SelectionChanged_Handler;         }         private void SelectionChanged_Handler() {             ISelection selection = ArcMap.Document.FocusMap.FeatureSelection;             IEnumFeature featuresEnum = (IEnumFeature)selection;             IEnumFeatureSetup featureSetup = (IEnumFeatureSetup)selection;             featureSetup.AllFields = true;             string message = "";             IFeature feature;             while ((feature = featuresEnum.Next()) != null) {                 int fldID = feature.Fields.FindField("locode");                 message += feature.get_Value(fldID).ToString() + ",";             }             System.Windows.Forms.MessageBox.Show(message);             Marshal.ReleaseComObject(featuresEnum);             Marshal.ReleaseComObject(featureSetup);             Marshal.ReleaseComObject(selection);         }     } } Please help, this has been bugging me for the good part of the last week! ... View more

I'm trying to get a value of a particular field from selected features. The features are from a layer that contains data from a file geodatabase. The data has been imported from an excel spreasheet, the file geodatabase is set as the default geodatabase and the feature class appears to be registered with it (the "Register with Geodatabase" option in the Manage menu is disabled). I obtain IEnumFeature from the focused map's FeatureSelection: IMap map = ArcMap.Document.ActiveView.FocusMap; IEnumFeature ftEnum = map.FeatureSelection as IEnumFeature; I then have a while loop that fetches selected features from the enum and tries to get a particular field value: IFeature ft = null; while ((ft = ftEnum.Next()) != null) {     int fid = ft.Fields.FindField("LOCODE");     string locode = ft.get_Value(fid) as string; } Now, the fid gets correctly assigned to 1, which is the index of the "LOCODE" field, but the returned value is null. I noticed that the features do not have OID associated with them. Why is that? If I export the feature class as a shapefile and add it to the map, the OIDs are set. But the "LOCODE" values are missing in either case. Why is this happening? ... View more

I want to bind an action to the SelectionChanged event on the map. In the extension, I bind the action to the focused map's SelectionChanged event upon firing ArcMap.Events.NewDocument and ArcMap.Events.NewDocument. The assumption I'm making here is that upon firing of the New(Open)Document events, there is an active document with a map so I can indeed bind actions to its events. But it doesn't work. What is the correct way of getting this to work? using System; using System.Collections.Generic; using System.Text; using System.IO; using ESRI.ArcGIS.ArcMapUI; using ESRI.ArcGIS.Carto; namespace BaseAddin {     public class BaseExt: ESRI.ArcGIS.Desktop.AddIns.Extension {         public BaseExt() {         }         protected override void OnStartup() {             WireUpEvents();         }         private void WireUpEvents() {             ArcMap.Events.NewDocument += ArcMap_NewOpenDocument;             ArcMap.Events.OpenDocument += ArcMap_NewOpenDocument;         }         private void ArcMap_NewOpenDocument() {             IMxDocument doc = ArcMap.Document as IMxDocument;             ((IActiveViewEvents_Event)doc.FocusMap).SelectionChanged +=                 new IActiveViewEvents_SelectionChangedEventHandler(delegate() {                     System.Windows.Forms.MessageBox.Show("Feature selection changed.");             });         }     } } ... View more

Should it be possible to build an add-in using ArcObjects SDK for .NET 10.2 and deploy the add-in in ArcMap 10.1? I have just tried that and ArcMap 10.1 crashed. To give you some context, my dev machine runs ArcDesktop 10.2.2 but I'm developing extensions for an organisation that has ArcDestop 10.1 only. What is the best practice in such circumstances? ... View more