Add Layers Descriptions

[John Allan]

Hi All,

I am trying to add a layer to a drawing using a function and it is not updating the Layers Description.
It works fine adding layers but dosen't apply the description, any ideas ?

Many Thanks,

publicvoid AddLayer(string LayerName, string Description)
{
Document doc = MgdAcApplication.DocumentManager.MdiActiveDocument;
Database db = HostApplicationServices.WorkingDatabase;
Editor ed = MgdAcApplication.DocumentManager.MdiActiveDocument.Editor;
doc.LockDocument();
Transaction tr = db.TransactionManager.StartTransaction();
using (tr)
{
LayerTable lt = tr.GetObject(db.LayerTableId, OpenMode.ForWrite) asLayerTable;
　
try
{
//checks provided layer has a valid name
SymbolUtilityServices.ValidateSymbolName(LayerName, false);
//check to see if exists
if (lt.Has(LayerName))
{
//ed.WriteMessage("\nLayer :" + LayerName + "Already Exists");
}
else
{
LayerTableRecord ltr = newLayerTableRecord()
{
Name = LayerName,
Description = Description, 
};
//ltr.Name = LayerName; // this was used for testing
//ltr.Description = "Hello";
ObjectId ltID = lt.Add(ltr);
tr.AddNewlyCreatedDBObject(ltr, true);
//db.Clayer = ltID;
db.Clayer = lt[LayerName];
tr.Commit();
//ed.WriteMessage("\nCreated Layer :" + LayerName);
}
}
catch
{
//ed.WriteMessage("\nInvalid Layer Name");
}
}
}

[kpblc2000]

I think you have to add a layer record to database and after that change description:

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.LayerManager;
using Autodesk.AutoCAD.Runtime;

namespace AddLayer
{
  public class CmdClass
  {
    [CommandMethod("cmdlayer")]
    public static void cmdAddLayer()
    {
      Document doc = Application.DocumentManager.MdiActiveDocument;
      Database db = doc.Database;
      doc.LockDocument();
      kpblc_AddLayer(ref db, "test layer 1", "description1");
    }

    private static void kpblc_AddLayer(ref Database db, string sLayerName, string Description)
    {
      Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
      using (Transaction tr = db.TransactionManager.StartTransaction())
      {
        LayerTable tblLayer = (LayerTable)tr.GetObject(db.LayerTableId, OpenMode.ForWrite);
        try
        {
          // SymbolUtilityServices.ValidateSymbolName(sLayerName, false);
          if (!(tblLayer.Has(sLayerName)))
          {
            // tblLayer.UpgradeOpen();
            LayerTableRecord recLayer = new LayerTableRecord();
            recLayer.Name = sLayerName;
            // recLayer.Description = Description;
            ObjectId recLayerID = tblLayer.Add(recLayer);
            tr.AddNewlyCreatedDBObject(recLayer, true);
            recLayer.Description = Description;
            tr.Commit();
          }
          else 
          {
            ed.WriteMessage("\nLayer {0} already exist", sLayerName);
            
          }
        }
        catch
        {
          ed.WriteMessage("\nLayer {0} can't be create: Invalid symbols", sLayerName);
        }
      }
    }
  }
}

[John Allan]

That worked a treat thank you,