ArcEngine实现图层地物合并的简单方法

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();
            IPolygonsPoly = new PolygonClass();
           ITopologicalOperator pTopo = sPoly as ITopologicalOperator;
           pTopo.ConstructUnion(pGeos);
           pTopo.Simplify();
            sPoly =pTopo as IPolygon;
           pflyrSelection.Clear();
            returnsPoly;
        }

    执行上面的代码段可以把图层上的所有实体合并。注意红色部分的那行代码，不写此行代码，pGeos 里的图形个数为0，最后得到的spoly是空。

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