Geometry 集合接口

private IPolygon ConstructorPolygon(List<IRing> pRingList)
{
	try
	{
		IGeometryCollection pGCollection = new PolygonClass();
		object o = Type.Missing;

		for (int i = 0; i < pRingList.Count; i++)
		{
			// 通过IGeometryCollection接口的AddGeometry方法向Polygon对象中添加Ring子对象
			pGCollection.AddGeometry(pRingList[i], ref o, ref o);
		}

		// QI至ITopologicalOperator
		ITopologicalOperator pTopological = pGCollection as ITopologicalOperator;
		
		// 执行Simplify操作
		pTopological.Simplify();

		IPolygon pPolygon = pGCollection as IPolygon;
		//返回Polygon对象
		return pPolygon;
	}
	catch (Exception Err)
	{
		return null;
	}
}

private IPolygon MergePolygons(IPolygon FirstPolygon, IPolygon SecondPolygon)
{
	try
	{
		// 创建一个Polygon对象
		IGeometryCollection pGCollection1 = new PolygonClass();
		IGeometryCollection pGCollection2 = FirstPolygon as IGeometryCollection;
		IGeometryCollection pGCollection3 = SecondPolygon as IGeometryCollection;

		// 添加FirstPolygon
		pGCollection1.AddGeometryCollection(pGCollection2);
		// 添加SecondPolygon
		pGCollection1.AddGeometryCollection(pGCollection3);

		// QI至ITopologicalOperator
		ITopologicalOperator pTopological = pGCollection1 as ITopologicalOperator;
		// 执行Simplify操作
		pTopological.Simplify();

		//返回Polygon对象
		IPolygon pPolygon = pGCollection1 as IPolygon;
		return pPolygon;
	}
	catch (Exception Err)
	{
		return null;
	}
}