issue with migrating to v2.3 toolkit

Question

we are in the process of upgrading to 2.3 and have a problem with the feature data grid. We have a FeatureDataGrid and when the user clicks on a record, the app zooms to and sets definition queries based on the feature. It works fine if I reference the v2.2 Toolkit.dll. As soon as I reference the v2.3 toolkit, this error pops up.
private void sectionDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (sectionDataGrid.SelectedIndex > -1)
            {
                MyMap.ZoomTo(sectionDataGrid.SelectedGraphics[0].Geometry);
                string wLiner = sectionDataGrid.SelectedGraphics[0].Attributes["SECTION"].ToString();
..... other code here....                
            }

I get a null error on the ZoomTo because SelectedGraphics.Count is always 0! So I can't get to the feature to zoom or get attributes.

JenniferNery · Answer

I apologize for the inconvenience. FeatureDataGrid.SelectedGraphics is always equal to the GraphicsLayer.SelectedGraphics in v2.3 and up. You might want to use e.AddedItems as suggested in post# 2 of this thread: http://forums.arcgis.com/threads/46013-FeatureDataGrid-Selection-Changed-Event

mahj · Answer

Hi,

I hade the same experience when upgrading from v2.1 to v.2.4.

You can find the workaround I used here: http://forums.arcgis.com/threads/26383-Problem-to-zoom-to-selected-graphic-for-the-feature-datagrid

Hope this can be of any help.

/Markus

pslgisAdmin · Answer

No luck getting at the data the way I used to with v2.2. Had to work around by getting the value out of the selected row for a specified column. Then do a query to get to the geomerty so I could zoom to the feature. And finally, set the definition queries to show only the needed data. Still hoping for some clarification here. private void sectionDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e) { if (sectionDataGrid.SelectedIndex > -1) { DataGridColumn d = sectionDataGrid.Columns[0]; FrameworkElement fe = d.GetCellContent(sectionDataGrid.SelectedItem); TextBlock tb = fe as TextBlock; string wLiner = tb.Text.ToString(); QueryTask qt = new QueryTask("http://pslgis.cityofpsl.com/ArcGIS/rest/services/LinerProjectSections/MapServer/0"); Query q = new Query(); q.Where = "SECTION = '" + wLiner + "'"; q.ReturnGeometry = true; q.OutSpatialReference = MyMap.SpatialReference; qt.ExecuteCompleted += qt_ExecuteCompleted; qt.ExecuteAsync(q); LayerDefinition lDef = new LayerDefinition(); lDef.LayerID = 0; lDef.Definition = "CitySection = '" + wLiner + "'"; LayerDefinition pDef = new LayerDefinition(); pDef.LayerID = 1; pDef.Definition = "CITYSECT = '" + wLiner + "'"; LayerDefinition bDef = new LayerDefinition(); bDef.LayerID = 2; bDef.Definition = "SECTION = '" + wLiner + "'"; ObservableCollection oc = new ObservableCollection(); oc.Add(lDef); oc.Add(pDef); oc.Add(bDef); ArcGISDynamicMapServiceLayer l = MyMap.Layers["Liner"] as ArcGISDynamicMapServiceLayer; l.LayerDefinitions = oc; l.Refresh(); if (l.Visible == false) l.Visible = true; } } private void qt_ExecuteCompleted(object sender, QueryEventArgs e) { MyMap.ZoomTo(e.FeatureSet.Features[0].Geometry); }