Edit Mleader style

By Virupaksha Aithal

Mleaderstyle objects are stored in the named object dictionary of the drawing database. Database object exposes an objectId “MLeaderStyleDictionaryId” to access this dictionary. Below code shows the procedure to edit a Mleader style.   Below code edits only the mleader style’s text height and color, but  Mleaderstyle object exposes many more properties to edit like “ArrowSymbolId”, “ArrowSize” “LandingGap” & etc.

[CommandMethod("EditMleaderStyle")]
static public void EditMleaderStyle() 
{
 
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = doc.Editor;
 
    using (Transaction tr =
                       db.TransactionManager.StartTransaction())
    {
        //Name of the mleader Style to edit
        const string styleName = "Standard";
 
        DBDictionary mlstyles = (DBDictionary)tr.GetObject(
                                        db.MLeaderStyleDictionaryId,
                                        OpenMode.ForRead);
 
        if (!mlstyles.Contains(styleName))
        {
            return;
        }
        ObjectId id = mlstyles.GetAt(styleName);
 
        //now get the active mleader style 
        MLeaderStyle currentStyle = tr.GetObject(id,    
                                OpenMode.ForWrite) as MLeaderStyle;
 
        //now edit the style
        currentStyle.TextColor =
                    Autodesk.AutoCAD.Colors.Color.FromRgb(255, 0, 0);
 
        //just double the text height
        currentStyle.TextHeight = currentStyle.TextHeight * 2;
 
        tr.Commit();
    }
}