IGeometryCollection unionCol = new GeometryBag() as IGeometryCollection; ITopologicalOperator unionPoly = new PolygonClass() as ITopologicalOperator; object Missing = Type.Missing; IFeature pFeature = featureCursor.NextFeature(); while(pFeature!=null) { IGeometry pGeometry = pFeature.Shape; unionCol.AddGeometry(pGeometry , ref Missing, ref Missing); pFeature = featureCursor.NextFeature(); } unionPoly.ConstructUnion((IEnumGeometry)unionCol);
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