Make a Layer Current (.NET)

You are always drawing on the active layer. When you make a layer active, you create new objects on that layer. If you make a different layer active, any new objects you create is assigned that new active layer and uses its color and linetype. You cannot make a layer active if it is frozen.

To make a layer active, use the Clayer property of the Database object or the CLAYER system variable. For example:

Make a layer current through the database

This example sets a layer current through the Database object with the Clayer property.

C# Example

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
 
[CommandMethod("SetLayerCurrent")]
public static void SetLayerCurrent()
{
    // 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 sLayerName = "Center";

        if (acLyrTbl.Has(sLayerName) == true)
        {
            // Set the layer Center current
            acCurDb.Clayer = acLyrTbl[sLayerName];

            // Save the changes
            acTrans.Commit();
        }

        // Dispose of the transaction
    }
}

Make a layer current with the CLAYER system variable

This example sets a layer current with the CLAYER system variable.

C# Example

Application.SetSystemVariable("CLAYER", "Center");