If you select a north arrow in a layout in ArcGIS Pro and go to Symbol>Properties>Halo, you can set the halo property of a north arrow.
Does anyone know how to access this property programmatically in the ArcGIS Pro SDK?
<SPAN class="comment token">//I am assuming the selected item is a north arrow</SPAN> <SPAN class="keyword token">var</SPAN> northArrow <SPAN class="operator token">=</SPAN> LayoutView<SPAN class="punctuation token">.</SPAN>Active<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelectedElements</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">First</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> QueuedTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Run</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">=</SPAN><SPAN class="operator token">></SPAN> <SPAN class="punctuation token">{</SPAN> <SPAN class="comment token">//CIMTopoNorthArrow is a different beast entirely...</SPAN> <SPAN class="keyword token">var</SPAN> cim <SPAN class="operator token">=</SPAN> northArrow<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetDefinition</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> CIMMarkerNorthArrow<SPAN class="punctuation token">;</SPAN> <SPAN class="comment token">//this halo symbol is 50% transparent, no outline (i.e. 0 width)</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN>CIMPointSymbol<SPAN class="punctuation token">)</SPAN>cim<SPAN class="punctuation token">.</SPAN>PointSymbol<SPAN class="punctuation token">.</SPAN>Symbol<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>HaloSymbol <SPAN class="operator token">=</SPAN> SymbolFactory<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ConstructPolygonSymbol</SPAN><SPAN class="punctuation token">(</SPAN> SymbolFactory<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ConstructSolidFill</SPAN><SPAN class="punctuation token">(</SPAN>ColorFactory<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">CreateRGBColor</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="number token">50</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> SymbolFactory<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ConstructStroke</SPAN><SPAN class="punctuation token">(</SPAN>ColorFactory<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN>BlackRGB<SPAN class="punctuation token">,</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN>CIMPointSymbol<SPAN class="punctuation token">)</SPAN>cim<SPAN class="punctuation token">.</SPAN>PointSymbol<SPAN class="punctuation token">.</SPAN>Symbol<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>HaloSize <SPAN class="operator token">=</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="comment token">//size of the halo</SPAN> <SPAN class="comment token">//set it back</SPAN> northArrow<SPAN class="punctuation token">.</SPAN><SPAN class="token function">SetDefinition</SPAN><SPAN class="punctuation token">(</SPAN>cim<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN></SPAN>
Works great, thank you! I was casting northArrow.GetDefinition() as CIMNorthArrow which was just the same as accessing the NorthArrow property of NorthArrowStyleItem.
Two things that may help:
1. When working with the CIM, I often set a line like this in my code: var str = cim.ToXML();
Then, in the debugger, I set a breakpoint on that line and now I can hover over "str" and use the text or xml viewer built in to visual studio to examine "str". [I am not sure if you realize but the CIM definition is serializable to XML]. Note that the "type" of each element is shown in the XML as well as the structure.
2. Use the CIM Viewer. It is a utility we (Pro SDK team) wrote for examining the CIM. You can find it here: arcgis-pro-sdk-cim-viewer
It allows you to see the CIM definition of maps, layers, layouts, and layout elements as well as edit their xml.
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