AutoCAD C#：如何获取块内修改后的Entity对象

我正在开发AutoCAD插件，需要获取块内已修改的Entity对象，该块仅包含一个实体。我为对应的BlockTableRecord编写了响应Modified事件的处理程序，但当前方法获取到的是模型空间中该实体的旧版本。

原实现代码 #

public static Entity GetEntityFromBlock(HooverSpace.Map.WorkSpace ws, BlockReference br, ObjectId entId)
{
    Entity ent = null;

    ObjectId blockId;

    if (ws.acBlkTbl.Has(br.Name))
        blockId = ws.acBlkTbl[br.Name];
    else
        return null;

    Entity searchEnt = (Entity)entId.GetObject(OpenMode.ForRead);

    BlockTableRecord btr = (BlockTableRecord)ws.acTrans.GetObject(blockId, OpenMode.ForRead);

    foreach (ObjectId blkEntId in btr)
    {
        Entity blockEnt = (Entity)ws.acTrans.GetObject(blkEntId, OpenMode.ForWrite);
        if (blockEnt.BlockName == btr.Name && blockEnt.Layer == searchEnt.Layer)
        {
            ent = blockEnt.Clone() as Entity;
            break;
        }
            
    }

    ent.TransformBy(br.BlockTransform);
    return ent;
}

补充说明 #

我通过从br.BlockTableRecord的ID获取BlockTableRecord解决了该问题，感谢大家！

内容的提问来源于stack exchange，提问作者SourceRaR