Sort Layers and Linetypes (.NET)

You can iterate through the Layers and Linetypes tables to find all the layers and linetypes in a drawing.

Iterate through the Layers table

The following example iterates through the Layers table to gather the names of all the layers in the drawing. The names are then displayed in a message box.

C# Example

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
 
[CommandMethod("DisplayLayerNames")]
public static void DisplayLayerNames()
{
    // Get the current document and database
    Document acDoc = Application.DocumentManager.MdiActiveDocument;
    Database acCurDb = acDoc.Database;

    // Start a transaction
    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Open the Layer table for read
        LayerTable acLyrTbl;
        acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
                                     OpenMode.ForRead) as LayerTable;

        string sLayerNames = "";

        foreach (ObjectId acObjId in acLyrTbl)
        {
            LayerTableRecord acLyrTblRec;
            acLyrTblRec = acTrans.GetObject(acObjId,
                                            OpenMode.ForRead) as LayerTableRecord;

            sLayerNames = sLayerNames + "\n" + acLyrTblRec.Name;
        }

        Application.ShowAlertDialog("The layers in this drawing are: " +
                                    sLayerNames);

        // Dispose of the transaction
    }
}