public void CreateRevolvedSolid()
{
// 在内存中创建旋转截面对象.
Circle ent = new Circle(new Point3d(200, 0, 0), Vector3d.ZAxis, 100);
// 截面对象添加到对象集合.
DBObjectCollection ents = new DBObjectCollection();
ents.Add(ent);
// 在内存中创建面域对象集合.
DBObjectCollection regions = Region.CreateFromCurves(ents);
// 实施旋转，并将旋转体添加到图形数据库.
ObjectId revolvedSolidId = ModelSpace.AddRevolvedSolid((Region)regions[0], new Point3d(300, 200, 100), new Point3d(600, 400, 200), 2 * Math.PI);
}
