合并一個圖層選擇對象C# arcengine

ArcEngine實現Merge功能

    private IGeometry GetGeo(IFeatureLayer pFlyr)
        {
            IEnumGeometry pGeos = new EnumFeatureGeometryClass();
            IEnumGeometryBind pGeosBind = pGeos as IEnumGeometryBind;
            IFeatureSelection pflyrSelection = pFlyr as IFeatureSelection;
            pflyrSelection.SelectFeatures(null, esriSelectionResultEnum.esriSelectionResultNew, false);            pGeosBind.BindGeometrySource(null, pflyrSelection.SelectionSet);
            pGeos.Reset();
            IPolygon sPoly = new PolygonClass();
            ITopologicalOperator pTopo = sPoly as ITopologicalOperator;
            pTopo.ConstructUnion(pGeos);
            pTopo.Simplify();
            sPoly = pTopo as IPolygon;
            pflyrSelection.Clear();
            return sPoly;
        }

     執行上面的程式碼片段可以把圖層上的所有實體合并。注意紅色部分的那行代碼，不寫此行代碼，pGeos 裡的圖形個數為0，最後得到的spoly是空。

 

來自：http://program.ntwtsp.com/aspnet/18234.htm