topic Re: Why does the intersect from Geometry service doesn't return attributes? in ArcGIS API for Silverlight Questions

Why does the intersect from Geometry service doesn't return attributes?

weiliang — Thu, 14 Apr 2011 20:55:34 GMT

Hi,

I try to use a polygon to intersect an underlying polygon layer by using the Geometry Service. However, the returned graphics results has no attributes associated. Is that designed on purpose? From the returned intersect result,since I can still get the same number of graphics from the returned intersect result as input underlying polygon layer, can I assume they are sequentially matched (which means the first graphic in the intersect result should have the save attributes with the first feature in the input underlying polygon layer)?

Thanks for your answer!

Wei

Re: Why does the intersect from Geometry service doesn't return attributes?

SanajyJadhav — Sat, 16 Apr 2011 06:33:27 GMT

I have also face the same problem.It is by design I guess.

Re: Why does the intersect from Geometry service doesn't return attributes?

dotMorten_esri — Sun, 17 Apr 2011 23:25:30 GMT

GeometryService only works against geometries, and have no concept of attributes. Therefore attributes are not preserved. Grab the geometry you get back and reassign the geometry on the Graphic you parsed in, if you want to modify the graphic instance. Or copy the attributes over to the new graphic feature you get back.

Re: Why does the intersect from Geometry service doesn't return attributes?

MichaelSnook — Wed, 19 Oct 2011 17:27:29 GMT

Morton...do you have a quick sample on re-assigning the attributes from the original graphics back to the Geometry service intersect results?

Thanks!

Re: Why does the intersect from Geometry service doesn't return attributes?

MichaelSnook — Wed, 19 Oct 2011 17:45:02 GMT

Ahh....nevermind. I was trying to go the wrong way around.

Since you can't assign attributes to a geometry I needed to start with my origina listing of graphics and assign the geometry out of the intersect. (like Morton said):

           List<Graphic> results = (List<Graphic>)e.Results;

            foreach (Graphic g in pointList)
            {
                g.Geometry = results.Geometry;
                SimpleMarkerSymbol symbol = new SimpleMarkerSymbol();
                g.Symbol = symbol;
                GraphicsLayer.Graphics.Add(g);
                i++;
            }

Hope that helps anyone else.