Gile.AutoCAD.Extension

AutoCAD Helpers Class Library

Thanks to all the Swampers who helped me learning AutoCAD .NET programming, with a special mention to Tony 'TheMaster' Tanzillo and Thorsten 'kaefer' Meinecke for the discussions about the GetObject and GetObjects methods which were the start points of this library.

This library should help to write code in a more concise and declarative way.

Example with a method to erase lines in model space which are smaller than a given distance:

public void EraseShortLines(double minLength)
{
    var db = Application.DocumentManager.MdiActiveDocument.Database;
    using (var tr = db.TransactionManager.StartOpenCloseTransaction())
    {
        var blockTable = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
        var modelSpace = (BlockTableRecord)tr.GetObject(blockTable[BlockTableRecord.ModelSpace], OpenMode.ForRead);
        var lineClass = RXObject.GetClass(typeof(Line));
        foreach (ObjectId id in modelSpace)
        {
            if (id.ObjectClass == lineClass)
            {
                var line = (Line)tr.GetObject(id, OpenMode.ForRead);
                if (line.Length < minLength)
                {
                    tr.GetObject(id, OpenMode.ForWrite);
                    line.Erase();
                }
            }
        }
        tr.Commit();
    }
}

The same method can be written:

public void EraseShortLines(double minLength)
{
    var db = Active.Database;
    using (var tr = db.TransactionManager.StartOpenCloseTransaction())
    {
        db.GetModelSpace(tr)
            .GetObjects<Line>(tr)
            .Where(line => line.Length < minLength)
            .UpgradeOpen(tr)
            .ForEach(line => line.Erase());
        tr.Commit();
    }
}

Reference one of these assemblies in AutoCAD .NET projects setting the Copy Locale property to True.

Download the assemblies (Gile.AutoCAD.R20.Extension.dll for AutoCAD 2015 to 2024, Gile.AutoCAD.R25.Extension.dll for AutoCAD 2025+).

See the documentation.