常用的命名空间如下：
using Autodesk.AutoCAD.DatabaseServices; 主要用于数据的存储，如Database，DBPoint，Line等 using Autodesk.AutoCAD.Geometry 常用于存储图形元素，如Point3d，Line3d，Curve3d using Autodesk.AutoCAD.ApplicationServices; 主要定义当前的Application、Document using Autodesk.AutoCAD.Runtime 主要用于当前的命令配置 using Autodesk.AutoCAD.EditorInput using Autodesk.AutoCAD.Interop;
AcadApplication,AcadDocuemnt等 using Autodesk.AutoCAD.BoundaryRepresebtation; Brep Edge Mesh等
常用的DLL和命名空间之间的关系
- acdbmgd.dll
包含对ObjectDBX API的封装。用于在图形文件中对对象进行操作。主要的命名空间有
Autodesk.AutoCAD.Colors
Autodesk.AutoCAD.DatabaseServices
Autodesk.AutoCAD.Geometry
Autodesk.AutoCAD.Runtime
Autodesk.AutoCAD.GraphicsInterface
Autodesk.AutoCAD.LayerManager
- acmgd.dll
包含大多数的API的调用，用于在CAD中进行操作
Autodesk.AutoCAD.ApplicationServices
Autodesk.AutoCAD.EditorInput
Autodesk.AutoCAD.Windows
Autodesk.AutoCAD.Windows.ToolPalette
Autodesk.AutoCAD.Internal.Windows
Autodesk.AutoCAD.Internal.Forms
- AcCui.dll
常用于用户界面的封装
Autodesk.AutoCAD.Customization
Autodesk.AutoCAD.Customization.Interop
- AdWindows.dll
用于当前操作界面的封装，主要是菜单和工具条
Autodesk.Windows
Autodesk.Windows.ToolBars
- acdbmgdbrep.dll
主要用于查询一些三维实体对象
Autodesk.AutoCAD.BoundaryRepresentation