Change Linetype Descriptions (.NET)

Linetypes can have a description associated with them. The description provides an ASCII representation of the linetype. You can assign or change a linetype description by using the AsciiDescription property.

A linetype description can have up to 47 characters. The description can be a comment or a series of underscores, dots, dashes, and spaces to show a simple representation of the linetype pattern.

Change the description of a linetype

The following example changes the description of the current linetype.

VB.NET

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
 
<CommandMethod("ChangeLinetypeDescription")> _
Public Sub ChangeLinetypeDescription()
    '' Get the current document and database
    Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
    Dim acCurDb As Database = acDoc.Database
 
    '' Start a transaction
    Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()
 
        '' Open the Linetype table record of the current linetype for write
        Dim acLineTypTblRec As LinetypeTableRecord
        acLineTypTblRec = acTrans.GetObject(acCurDb.Celtype, _
                                            OpenMode.ForWrite)
 
        '' Change the description of the current linetype
        acLineTypTblRec.AsciiDescription = "Exterior Wall"
 
        '' Save the changes and dispose of the transaction
        acTrans.Commit()
    End Using
End Sub

C#

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
 
[CommandMethod("ChangeLinetypeDescription")]
public static void ChangeLinetypeDescription()
{
    // 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 Linetype table record of the current linetype for write
        LinetypeTableRecord acLineTypTblRec;
        acLineTypTblRec = acTrans.GetObject(acCurDb.Celtype,
                                            OpenMode.ForWrite) as LinetypeTableRecord;
 
        // Change the description of the current linetype
        acLineTypTblRec.AsciiDescription = "Exterior Wall";
 
        // Save the changes and dispose of the transaction
        acTrans.Commit();
    }
}

VBA/ActiveX Code Reference

ThisDrawing.ActiveLinetype.Description = "Exterior Wall"