AutoCAD Code Pack

Previously hosted on CodePlex.

AutoCAD Code Pack is a powerful library that helps you to develop AutoCAD plugins using the AutoCAD .NET API. It re-encapsulates the over-designed and old-fashioned classes and methods into easy-to-use static modules and functions. It also brings modern C# syntax like LINQ and lambdas (functional programming) to AutoCAD development. With all the features it provides, you can save over half the lines of your code.

The library was originally developed for AutoCAD R18 (2010, 2011, 2012) and .NET 3.5. We recently updated it to target AutoCAD R23 (2019) and .NET 4.7.1, thanks to the contribution from @lavantgarde. You can target other versions with the source files and build yourself.

View Test.cs for API usage examples.

Modules

The library consists of the following modules:

• Draw to directly draw entities (with AutoCAD-command-like functions)
• NoDraw to create in-memory entities
• Modify to edit entities (with AutoCAD-command-like functions)
• Annotation to draw annotations
• DbHelper to manipulate the DWG database
• QuickSelection to simplify entity manipulation with LINQ style coding experience (like jQuery, if you know some Web)
• Interaction to handle user interactions
• Algorithms to offer some mathematical helpers
• MultiDoc to process cross-document scenarios
• CustomDictionary to help you attach data to entities
• SymbolPack to help you draw symbols like arrows, etc.
• IronPython to allow you use IronPython in AutoCAD

A Quick Look

You may write this elegant code with the code pack:

/// <summary>
/// Eliminate zero-length polylines
/// </summary>
[CommandMethod("PolyClean0", CommandFlags.UsePickSet)]
public static void PolyClean0()
{
    var ids = Interaction.GetSelection("\nSelect polyline", "LWPOLYLINE");
    int n = 0;
    ids.QForEach<Polyline>(poly =>
    {
        if (poly.Length == 0)
        {
            poly.Erase();
            n++;
        }
    });
    Interaction.WriteLine("{0} eliminated.", n);
}

instead of the verbose version using original API:

[CommandMethod("PolyClean0_Old", CommandFlags.UsePickSet)]
public static void PolyClean0_Old()
{
    string message = "\nSelect polyline";
    string allowedType = "LWPOLYLINE";
    Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
    PromptSelectionOptions opt = new PromptSelectionOptions { MessageForAdding = message };
    ed.WriteMessage(message);
    SelectionFilter filter = new SelectionFilter(new TypedValue[] { new TypedValue(0, allowedType) });
    PromptSelectionResult res = ed.GetSelection(opt, filter);
    if (res.Status != PromptStatus.OK)
    {
        return;
    }            
    ObjectId[] ids = res.Value.GetObjectIds();
    int n = 0;
    Database db = HostApplicationServices.WorkingDatabase;
    using (Transaction trans = db.TransactionManager.StartTransaction())
    {
        foreach (ObjectId id in ids)
        {
            Polyline poly = trans.GetObject(id, OpenMode.ForWrite) as Polyline;
            if (poly.Length == 0)
            {
                poly.Erase();
                n++;
            }
        }
        trans.Commit();
    }
    ed.WriteMessage("{0} eliminated.", n);
}

Examples

View Test.cs for detailed API usage examples.