Imports Autodesk.AutoCAD.ApplicationServicesImports Autodesk.AutoCAD.EditorInputImports Autodesk.AutoCAD.RuntimePublic Class WellcomCADImplements IExtensionApplicationPublic Sub Initialize() Implements IExtensionApplication.InitializeMsgBox("net程序已經初始化！")End SubPublic Sub Terminate() Implements IExtensionApplication.TerminateDebug.WriteLine("net程序即將銷毀")End Sub<CommandMethod("Hello")>Public Sub Hello()Dim ed As Editor = Application.DocumentManager.MdiActiveDocument.Editored.WriteMessage("歡迎進入cad世界！")End SubEnd Class

這樣就可以在啟動net程序時做一些初始化和收尾工作，比如初始環境檢測、程雪結束釋放資源，相關內容寫入日志等