CAD实体与AS元素之间的访问

// convert this id from “AdvanceSteel” id to “Acad” id
一：通过ID交换的实现:
1：AS---->>>CAD

// get the "representation" id - the id that AutoCAD understands as being the object drawn on the screen
    ASObjectId reprId = DatabaseManager.GetReprId(beam);
    ObjectId acadIdBeam = new ObjectId(reprId.AsOldId());

2：CAD---->>>AS

 ObjectId[] ids = acSSet.GetObjectIds();
 //Iterate through the selected objects, and check if we have a straight beam
 foreach (ObjectId id in ids)
    {
       //Get the beam filer object
       ASObjectId idDbObject = DatabaseManager.GetFilerObjectId(new ASObjectId(id.OldIdPtr), false);
       FilerObject obj = DatabaseManager.Open(idDbObject);
   }

二：cad----->>as转换
通过提取CAD实体的信息重新生成AS元素

polyline = acTrans.GetObject(acEnt.ObjectId, OpenMode.ForWrite) as Polyline;//cad实体polyline
index = 0;
CircularArc3d arc3D = polyline.GetArcSegmentAt(index);//获取多段线中的弧0,1,2,3...
Point3d point3D = polyline.GetPoint3dAt(index);//获取多段线的顶点坐标0,1,2,3...
double bulg = polyline.GetBulgeAt(index);//获取多段线中的曲度值0,1,2,3...
MessageBox.Show("\n 多段线半径:" + arc3D.Radius);
MessageBox.Show("\n 多段线拐点数目:" + polyline.NumberOfVertices);
MessageBox.Show("\n 多段线顶点坐标:" + point3D.X + " " + point3D.Y + " " + point3D.Z);
MessageBox.Show("\n 多段线曲度1:" + bulg);
MessageBox.Show("\n 多段线曲度2:" + polyline.GetBulgeAt(2));