目前比较流行的AutoCAD.NET二次开发教程，并有实例说明，适合新手入门。 分为VB.net 和 C#.net 两部分。每一部分除讲解外并配有实例。-Currently more popular AutoCAD.NET secondary development tutorials and examples for beginners. Divided into VB.net and C#. Net in two parts. In addition to explaining each