Is DictionarySymbolPreview sample broken?

Question

Hi -

Using Pro 2.7 and data from CommunitySampleData-12-15-2020, when I choose the METOCPoints (Atmospheric), SymbolsetID:45  in the DictionarySymbolPreview sample I get a null reference exception.

I wonder if something's not configured correctly.

Thanks, Kirk

KirkKuykendall1 · Answer

This is probably a separate issue: exception when opening DictionarySymbolView designer (cannot find actipro toolwindow).

Severity Code Description Project File Line Suppression State
Error Type reference cannot find type named '{clr-namespace:ActiproSoftware.Windows.Controls.Docking;assembly=ArcGIS.Desktop.Docking.Wpf}ToolWindow'. DictionarySymbolPreview D:\repos\esri\arcgis-pro-sdk-community-samples\Map-Authoring\DictionarySymbolPreview\UI\DictionarySymbolView.xaml 19

To reproduce:

Open sln, notice nuget packages are broken, so update to 4.0.2 ...

Clean and rebuild, no errors.

Open the DictionarySymbolView in designer and see error.

CharlesMacleod · Answer

Kirk, I dug into this a little deeper. It looks like, in some cases, particular symbolsets have a "000000 - Unspecified" symbol entity as the default. The Atmospheric symbols - symbolset 45 and 46 as examples. So the initial pick of the METOCPoints, Lines, Polys triggers a search for the default entity: "symbolentity 0". Now, I _think_ the GetDictionarySymbol used to return a default symbol for undefined entities?? - but it could just be a bug in the sample - anyway, when I select a "real" entity from the symbolentity drop down (i.e. something other than 000000 - eg 110100), I get the correct symbol retrieved and loaded. I think the best thing to do is simply wrap the GetDictionarySymbol call in a try/catch to prevent the null symbol being returned from blowing up the dockpane in those cases where an unspecified "000000" symbol is being requested. private Task GenerateBitmapImageAsync(Dictionary attributes) { return QueuedTask.Run(() => { try { CIMSymbol symbol = ArcGIS.Desktop.Mapping.SymbolFactory.Instance.GetDictionarySymbol( "mil2525d", attributes); var si = new SymbolStyleItem() { Symbol = symbol, PatchHeight = 64, PatchWidth = 64 }; return si.PreviewImage; } catch(NullReferenceException) { return null; } }); } UnspecifiedEntity.png

KirkKuykendall1 · Answer

Starting with a fresh MilitaryOverlay.aprx from the zip file, I see a ! next to the stylx:

I clicked and browsed for:

"C:\Program Files\ArcGIS\Pro\Resources\Dictionaries\mil2525d\mil2525d.stylx"

and the ! cleared.

Still get null ref exception though.