how to get boundary of polygons?

Question

Hi,Everyone
I have a polygon by QueryTask.I want to fill this polygon with a color but another color for it's  boundary .
So I want to know how to get the boundary of polygon and return a ployline.

Thanks!

jianhuizhou · Answer

Thanks !
I have found this method.but my ploygon is combined from multiple polygon,I don't want all the boundary but the combined polygon's.
Any idea?

RobertScheitlin__GISP · Answer

jianhui, All you do is assign a new SimpleLineSymbol to the outline property of the SimpleFillSymbol for the graphic you are trying to change.