ObjectARX® now provides managed wrapper classes that allow you to use the Microsoft .NET Framework and to write programs in other languages such as VB .NET and C#. See the Managed Wrapper Classes section of the ObjectARX Reference for a complete list of the managed wrapper classes that are available for ObjectARX for AutoCAD 2005. (These classes are not included in the New Classes topic.)
sample 下有几个vb.net的例子