I get COM exception when I try to create PolylineZM feature for Roads/Highways events. I use ArcObjects SDK for .NET. Is there any example of it?
The geometry you create must be ZAware = true (and MAware).
If it is a point you should give it Z and M values. If it is a polygon/polyline all the points should have Z & M before added to the polygon/polyline that should be Z/MAware.
Just make sure that the event layer is defined as a layer that has Z & M
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