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//¶ÔӦ·Ïß
IPointCollection pLinePc = new PolylineClass();//Ò»¶¨ÒªÉèÖÃΪÏßÀà


for (int j = 0; j < _AllDBLineList[k]._pPc.Count; j++)
{
IPoint tmpt = new PointClass();
tmpt.PutCoords(_AllDBLineList[k]._pPc[j].x, _AllDBLineList[k]._pPc[j].y);
pLinePc.AddPoint(tmpt);
}

IPolyline pPolyline = pLinePc as IPolyline;

//¶ÔÓ¦Ãæ
IPointCollection pPolygonPc = new PolygonClass();


for (int j = 0; j < _AllDBLineList[k]._pPc.Count; j++)
{
IPoint tmpt = new PointClass();
tmpt.PutCoords(_AllDBLineList[k]._pPc[j].x, _AllDBLineList[k]._pPc[j].y);
pPolygonPc.AddPoint(tmpt);
}
IPolygon pPolygon = pPolygonPc as IPolygon;