Autodesk.AutoCAD.Runtime.Exception: 'eNoDatabase'

[agomezfe]

I am writing a C#.NET program that interacts with AutoCAD through the AutoCAD .NET API.

The program changes the objects from one layer to another, if the layer does not exist it creates a new one with some parameters that are passed through a document. To open the document we use the ReadDwgFile method. We open the document in a hidden way, so that it does not run. I have tried to change the transparency of the document that I have active, and it does it without problems, it gives me an error when I do it in a file that I do not have active. So I think the error is there. Is there a way to change the transparency of a layer whose file I have opened with the ReadDwgFile method?

 The program gives an error when I want to change the transparency of the layer of a document that I do not have open.

                using (Database destinationDatabase = new Database(false, true))
                {
                    destinationDatabase.ReadDwgFile(file.FullName, FileShare.ReadWrite, true, "");


                    using (Transaction destinationTransaction = destinationDatabase.TransactionManager.StartTransaction())
                     {
                      BlockTable bt = (BlockTable)destinationTransaction.GetObject(destinationDatabase.BlockTableId, OpenMode.ForWrite);
                        BlockTableRecord record = destinationTransaction.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
                        LayerTable layertable;
                        layertable = destinationTransaction.GetObject(destinationDatabase.LayerTableId,OpenMode.ForWrite) as LayerTable;
                        foreach (ObjectId ob in record)
                        {
                            Entity eo = (Entity)ob.GetObject(OpenMode.ForWrite);
                            if (DicLayer.Keys.Contains(eo.Layer))
                            {
                                ClassLayer layer = DicLayer[eo.Layer];

                                if (!layertable.Has(layer.LayerNewName))
                                {
                                    using (LayerTableRecord layertablerecord = new LayerTableRecord())
                                    {

                                        Type enumType = typeof(LineWeight);
                                        System.Reflection.FieldInfo[] fieldInfos = enumType.GetFields();
                                        Dictionary<string, FieldInfo> lineWeigthDict = new Dictionary<string, FieldInfo>();
                                        foreach (System.Reflection.FieldInfo fieldInfo in fieldInfos)
                                        {
                                            lineWeigthDict.Add(fieldInfo.Name, fieldInfo);
                                        }
                                        LinetypeTable acLinTbl;
                                        acLinTbl = destinationTransaction.GetObject(destinationDatabase.LinetypeTableId,
                                                                        OpenMode.ForWrite) as LinetypeTable;
                                        // Line Weight
                                        string lineWeigtName = "";
                                        String lwn = layer.LineWeight;
                                        switch (lwn)
                                        {
                                            case "Default":
                                                lineWeigtName = "ByLineWeightDefault";
                                                break;
                                            default:
                                                 lineWeigtName = "LineWeight" + layer.LineWeight;
                                                break;

                                        }
                                        
                                        LineWeight lineWeight = (LineWeight)lineWeigthDict[lineWeigtName].GetValue(null);
                                      
                                        





                                        layertablerecord.Color = Color.FromColorIndex(ColorMethod.ByAci, short.Parse(layer.Color.ToString()));
                                        layertablerecord.Name = layer.LayerNewName;
                                        layertablerecord.LineWeight = lineWeight;
                                        layertablerecord.LinetypeObjectId = acLinTbl[layer.LineType];
                                        Byte alpha = (Byte)(255 * (100 - Int32.Parse(layer.Transpaerncy)) / 100);
                                        Transparency transparency = new Transparency(alpha);
                                        layertablerecord.Transparency = transparency;







                                        // Upgrade the Layer table for write
                                        destinationTransaction.GetObject(destinationDatabase.LayerTableId, OpenMode.ForWrite);
                                                                             
                                        // Append the new layer to the Layer table and the transaction
                                        layertable.Add(layertablerecord);
                                        destinationTransaction.AddNewlyCreatedDBObject(layertablerecord, true);

                                    }
                                    eo.Layer = layer.LayerNewName;
                                }
                                else
                                {
                                    eo.Layer = layer.LayerNewName;
                                }

                            }




                        }



                        destinationTransaction.Commit();

                    }
                    destinationDatabase.RetainOriginalThumbnailBitmap = true;
                    destinationDatabase.SaveAs(file.FullName, true, DwgVersion.Current, null);


                }

[WonkaPet · Accepted solution]

Can you try changing the transparency after you add the layertablerecord to the database?
Try changing the transparency on line 76.

[agomezfe]

Thanks, the change has worked correctly for me.