请教，为什么Ent是空的

dpec1982 · 发表于 2015-6-11 15:00:00

功能：根据已知的坐标，给块参照加颜色，但语句中的Ent一直是空，而ID是有值的
   private void getBlkForPt(Point3d dataBasePt)
      {
         Document doc = app.DocumentManager.MdiActiveDocument;
         BlockReference Blk = null;
         using (Transaction trans = doc.TransactionManager.StartTransaction())
         {
            BlockTable BlkTab = (BlockTable)trans.GetObject(doc.Database.BlockTableId, OpenMode.ForRead,true) as BlockTable;
            foreach (ObjectId ID in BlkTab)
            {
                  Entity Ent = trans.GetObject(ID,OpenMode.ForRead,true) as Entity;
                  if (Ent != null)
                  {
                     if (Ent is BlockReference)
                     {
                        Blk = (BlockReference)Ent;
                        Point3d pt = Blk.Position;
                        if (pt.DistanceTo(dataBasePt) <= 1)
                        {
                              Blk.Color = Autodesk..Colors.Color.FromRgb(255, 0, 0);
                        }
                     }
                  }
            }
         }
      }

请教，为什么Ent是空的

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