ArcEngine画Polygon小问题，未解。。。

小米是用pointCollection 来创建polygon的，程序编译通过无误，但小米想更换了pointCollection。Add （）的顺序后成一新的polygon，就通不过了，弱弱的想不明白。
上部分代码：
               IWorkspaceEdit workspaceEdit = workspace as IWorkspaceEdit;
                workspaceEdit.StartEditing(true);
                workspaceEdit.StartEditOperation();

                IPoint point = new PointClass();
                point.X = 155.00;                                                   //点的坐标传入。
                point.Y = 39.00;

                IPoint point2 = new PointClass();
                point2.X = 155.00;                                                   //点的坐标传入。
                point2.Y = 40.00;
                IPoint point3 = new PointClass();
                point3.X = 156.00;                                                   //点的坐标传入。
                point3.Y = 41.00;

                IPoint point4 = new PointClass();
                point4.X = 154.50;                                                   //点的坐标传入。
                point4.Y = 39.00;

                IPointCollection4 pointCollection = new PolylineClass();
                object miss = Type.Missing;

                pointCollection.AddPoint(point, ref miss, ref miss);
                pointCollection.AddPoint(point2, ref miss, ref miss);
                pointCollection.AddPoint(point3, ref miss, ref miss);
                 pointCollection.AddPoint(point4, ref miss, ref miss);  //少了这一点通过
                pointCollection.AddPoint(point, ref miss, ref miss);// end点一定要和以前某点闭合
                
                IGeometryCollection pGeoColl = pointCollection as IGeometryCollection;
                ISegmentCollection pRing = new RingClass();
                pRing.AddSegmentCollection(pGeoColl as ISegmentCollection);

                IGeometryCollection pPolygon = new PolygonClass();
                pPolygon.AddGeometry(pRing as IGeometry, ref miss, ref miss);

                IFeature feature = feaPointClass.CreateFeature();
                feature.Shape = (IGeometry)pPolygon;
                //feature.set_Value(feature.Fields.FindField("Traj_projection_name"), "sagfre");
                //feature.set_Value(feature.Fields.FindField("bbb"), "safas");
                feature.Store();

                workspaceEdit.StopEditOperation();
                workspaceEdit.StopEditing(true);

4 个解决方案