topic Re: Drawing .shp file is slow with .NET C# API in .NET Maps SDK Questions

Drawing .shp file is slow with .NET C# API

MattiasWesterberg — Thu, 26 Jan 2023 13:01:37 GMT

Hi,

I am trying to draw a large .shp file using the class ShapefileFeatureTable as below(.NET C#).
The size of the .shp file is quite large: 63,6 MB (66 731 956 byte).

Map myMap = MyMapView.Map; ShapefileFeatureTable myShapefileFeatureTable = await ShapefileFeatureTable.OpenAsync("C:\\myShpFile.shp"); FeatureLayer myFeatureLayer = new FeatureLayer(myShapefileFeatureTable); MyMapView.Map.OperationalLayers.Add(myFeatureLayer);

The problem is that drawing it is very slow. First it takes a long time for the layer to show up at all.
Then when I zoom or scroll the map, it takes too long time for the layer to be redrawn.

When I open the same file in ArcGiS Pro it is shown much faster. Same for scrolling and zooming.

Is it possible to make drawing of such a large .shp file faster when using ArcGIS .NET C# API?
I have "licence for developer use only".

Any input would be appreciated.

Thanks, Mattias

Re: Drawing .shp file is slow with .NET C# API

MichaelBranscomb — Thu, 26 Jan 2023 16:33:10 GMT

Hi,

A few questions:

What geometry type is your shapefile? (point/line/polygon)
Do you override the default RenderingMode (dynamic/static) For more info see Performance considerations | ArcGIS Maps SDK for .NET | ArcGIS Developers
Do you assign symbols to individual features or a renderer to the feature layer? For more info see Symbols, renderers, and styles | ArcGIS Maps SDK for .NET | ArcGIS Developers

Thanks

Re: Drawing .shp file is slow with .NET C# API

MattiasWesterberg — Fri, 27 Jan 2023 11:25:36 GMT

I changed the RenderingMode to Dynamic. So now it draws my .shp file much faster.

myFeatureLayer.RenderingMode = FeatureRenderingMode.Dynamic;

Thanks a lot!