按内环（孔洞）面积删除内环

/// <summary>
/// 按内环（孔洞）面积删除内环
/// </summary>
/// <param name="pPolygon"></param>
/// <param name="Area">删除小于此值的内环，当值小于等于0时全部删除</param>
/// <returns></returns>
public IPolygon Delete_InteriorRingBag(IPolygon pPolygon,double Area)
{
    IPolygon4 pPolygon4 = pPolygon as IPolygon4;
    //外环
    IGeometry pGeoExter = (pPolygon4.ExteriorRingBag as IGeometryCollection).get_Geometry(0);


    
    //内环
    IGeometryCollection pGeos = pPolygon4.get_InteriorRingBag(pGeoExter as IRing) as IGeometryCollection;


    for (int i = 0; i < pGeos.GeometryCount; i++)//遍历内环，对满足要求的内环Union至输入polygon
    {
        IGeometry pGeoInter = pGeos.get_Geometry(i);

        if (Math.Abs((pGeoInter as IArea).Area) > (Area<=0?double.MaxValue:Area))
        {
            ITopologicalOperator pTopo = pPolygon as ITopologicalOperator;
            IPointCollection pinterPoints = pGeoInter as IPointCollection;

            IPointCollection pPointsNew = new PolygonClass();
            pPointsNew.AddPointCollection(pinterPoints);                    
            IPolygon pU = pPointsNew as IPolygon;

            ITopologicalOperator pTopoSim = pU as ITopologicalOperator;
            pTopoSim.Simplify();

            pPolygon = pTopo.Union(pU) as IPolygon;
        }
    }
    return pPolygon;
}