Topic: How to get an objects layer

[T.Willey]

When using code like whats posted below (which does not work), how can you get the layer?  I have tried serval methods, and none seem to work.  I'm so lost.  Any/all help appreciated.

Code: [Select]

public void MyPrintMspace()
{
Database db = HostApplicationServices.WorkingDatabase;
Transaction trans = db.TransactionManager.StartTransaction();
Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
BlockTable bt = (BlockTable)(trans.GetObject(db.BlockTableId, OpenMode.ForRead));
BlockTableRecord btr =(BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead);
foreach (ObjectId ObjId in btr)
{
DBObject DbObj = trans.GetObject(ObjId, OpenMode.ForRead);
ed.WriteMessage("\n " + DbObj.ToString());
Entity Ent = trans.GetObject(ObjId, OpenMode.ForRead);
ed.WriteMessage("\n  Layer: " + Ent.Layer);
}
trans.Commit();
trans.Dispose();
}


[LE]

Code: [Select]

                //Entity Ent = trans.GetObject(ObjId, OpenMode.ForRead);
                Entity Ent = DbObj as Entity;

I tried your code, and did not run here... I change it to what it is above... now, let me find where is the info to simple return the layer name...

[T.Willey]

Code: [Select]

                //Entity Ent = trans.GetObject(ObjId, OpenMode.ForRead);
                Entity Ent = DbObj as Entity;

I tried your code, and did not run here... I change it to what it is above... now, let me find where is the info to simple return the layer name...

Thanks Luis!!  You don't know how long I have spent looking for this simple answer.  How did you know to do it this way.  Here is the code I use to print the layer name.

Code: [Select]

foreach (ObjectId ObjId in btr)
{
DBObject DbObj = trans.GetObject(ObjId, OpenMode.ForRead);
ed.WriteMessage("\n " + DbObj.ToString());
Entity Ent = DbObj as Entity;
ed.WriteMessage("\n  Layer: " + Ent.Layer);
}


[Kerry]

If you don't need to use the bdObj later, you could cast in-line rather than create another variable ...

Code: [Select]

        public static void MyPrintMspace_1()
        {
            Database db = HostApplicationServices.WorkingDatabase;
            Editor ed = AcadApp.DocumentManager.MdiActiveDocument.Editor;           
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {
                BlockTable bt = (BlockTable)(trans.GetObject(db.BlockTableId, OpenMode.ForRead));
                foreach (ObjectId ObjId in
                    (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead))
                {
                    Entity Ent = (Entity)trans.GetObject(ObjId, OpenMode.ForRead, true);
                    ed.WriteMessage("\n  Layer: " + Ent.Layer);
                }               
            }
        }

[T.Willey]

Thanks Kerry.  I could have sworn I tried tha way, and it didn't work for me, but yours did.

[Kerry]

.. or if you wanted to keep the dbObj, you could still cast in-line inside the writemessage

Code: [Select]

                foreach (ObjectId ObjId in btr)
                {
                    DBObject DbObj = trans.GetObject(ObjId, OpenMode.ForRead);
                    ed.WriteMessage("\n " + DbObj.ToString());                   
                    ed.WriteMessage("\n  Layer: " + (DbObj as Entity).Layer);
                }

[Kerry]

... and if you want to be frugal :-

this :,

Code: [Select]

ed.WriteMessage("\n " + DbObj.ToString());could become this :

Code: [Select]

ed.WriteMessage("\n " + DbObj);

[T.Willey]

 

This was one of my first C# routines, I just changed it so I could test for getting the layer of and entity.  I use the same method in my larger program to step through all the objects in the drawing.  I just couldn't, for the life of me, find a way to turn it into an entity.

Thanks for all the options Kerry.  I'm still learning, and this is some good information.

[Kerry]

You're welcome Tim

 ... but keep in mind I'm learning too so the stuff I'm posting may not be optimal.

 

[T.Willey]

You're welcome Tim

 ... but keep in mind I'm learning too so the stuff I'm posting may not be optimal.

 

Okay Kerry.  It was just funny to see how a simple program, written when one first learns something, can be changed so much to run faster, better with less lines of code.  Got to love experience!

[LE]

To me when starting learning a new software language it is better not trying to come up with the greatest solutions or the best compact code, that will come up as is mentioned with experience.