Is DictionarySymbolPreview sample broken?

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01-13-2021 11:00 AM
KirkKuykendall1
Occasional Contributor II

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.

image.png

I wonder if something's not configured correctly.

Thanks, Kirk

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CharlesMacleod
Esri Contributor

~Hi Kirk, the sample is designed for use with "mil2525d". To change it you would have to replace that literal string with the name of your dictionary. However, I think the property grid expects mil2525d entities also so that might break also but it's been quite a few years since I wrote that sample and I don't remember all the details.~

scratch that - I see u are using mil2525d. I'm not sure off the top of my head. Looks like the GetDictionarySymbol call does not find your selected symbol and, off the top of my head, I dont know why

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CharlesMacleod
Esri Contributor

Hi Kirk, looks like a bug in GetDictionarySymbol. I'll keep u posted.

KirkKuykendall1
Occasional Contributor II

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

KirkKuykendall1_0-1610569829795.png

I clicked and browsed for:

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

and the ! cleared.

Still get null ref exception though.

 

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CharlesMacleod
Esri Contributor

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<ImageSource> GenerateBitmapImageAsync(Dictionary<string, object> 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;
              }
            });
        }

 

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KirkKuykendall1
Occasional Contributor II

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 ...

KirkKuykendall1_0-1610639476381.png

Clean and rebuild, no errors.

Open the DictionarySymbolView in designer and see error.

 

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