Adding a new layer and making it current layer

Jun 19, 2012

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Below sample code shows the procedure to add a new layer. All layers are stored in a symbol table called layer table. To make any layer as current layer, set the Database property Clayer with the object id of the layer.

[CommandMethod("AddLayer")]
public void AddLayer()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = doc.Editor;
 
    using (Transaction tr = db.TransactionManager.StartTransaction())
    {
        LayerTable ltb = (LayerTable)tr.GetObject(db.LayerTableId, 
                                                  OpenMode.ForRead);
        //create a new layout.
        if (!ltb.Has("NewLayer"))
        {
            ltb.UpgradeOpen();
            LayerTableRecord newLayer = new LayerTableRecord();
            newLayer.Name = "NewLayer";
 
            newLayer.LineWeight = LineWeight.LineWeight005;
            newLayer.Description = "This is new layer";
 
            //red color
            newLayer.Color =
                    Autodesk.AutoCAD.Colors.Color.FromRgb(255, 0, 0);
 
            ltb.Add(newLayer);
            tr.AddNewlyCreatedDBObject(newLayer, true);
        }
 
        tr.Commit();
        //make it as current
        db.Clayer = ltb["NewLayer"];
    }
 
}

Comments

8 responses to “Adding a new layer and making it current layer”

Matus Brlit

June 22, 2012

Just a note:
When I don’t need the editor object, like in this case, I obtain the Database object from HostApplicationServices.WorkingDatabase because it’s thread-safe.
Obtaining it this way is not.

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Owen Wengerd

June 22, 2012

When a user runs a command, they expect it to use the database for the document running the command, which is not necessarily the working database.

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Artvegas

August 3, 2012

The layer Description property doesn’t seem to get set to. Didn’t work in either 2012 or 2013. Reading user-defined layer description worked ok.
What’s up with that?

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Nikhil Ruikar

February 1, 2018

The above written code works fine when I am creating a single layer. It fails when creating multiple layers.
Here’s my code which fails at,
LayerTable layerTable = (LayerTable)this.transaction.GetObject(this.database.LayerTableId, OpenMode.ForRead);
Code:
/////////////////////////////////////////////////////////////////////////////////////////////
foreach (LayerAttributeColor item in layerColorAttributeValues)
{
LayerTable layerTable = (LayerTable)this.transaction.GetObject(this.database.LayerTableId, OpenMode.ForRead);
if (!layerTable.Has(item.LayerName))
{
LayerTableRecord ltr = new LayerTableRecord();
// … and set its properties
ltr.Name = item.LayerName;
ltr.Color = Autodesk.AutoCAD.Colors.Color.FromRgb(255, 0, 0);
// Add the new layer to the layer table
layerTable.UpgradeOpen();
ObjectId ltId = layerTable.Add(ltr);
layerTable.DowngradeOpen();
this.transaction.AddNewlyCreatedDBObject(ltr, true);
// Set the layer to be current for this drawing
//this.database.Clayer = ltId;
// Commit the transaction
this.transaction.Commit();
ltr.Dispose();
}
}
/////////////////////////////////////////////////////////////////////////////////////////////
The exception message reads as,
“Operation is not valid due to the current state of the object”.
Please advise.

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