该样例程序是通过执行“AddEvent”命后，进行注册Objecterased事件。在注册了该事件之后，每当删除对象时，就是激活该事件进行调用自定义的ObjecterasedEvent函数。
但是如果运行RemoveEvent命令后，将会注销该命令。在注册了该命令后，即使是删除对象，也不会激活事件的。即也不会调用自定义函数。
Imports ZwSoft.ZwCAD.Runtime
Imports ZwSoft.ZwCAD.DatabaseServices Imports ZwSoft.ZwCAD.applicationservices Namespace ZwApp Public Class EventSample <CommandMethod("AddEvent")> _ Public Sub AddobjecterasedEvent() Dim ZcDB As Database = Hostapplicationservices.WorkingDatabase AddHandler ZcDB.Objecterased,AddressOf ObjecterasedEvent End Sub <CommandMethod("RemoveEvent")> _ Public Sub RemoveObjecterasedEvent() Dim ZcDB As Database = Hostapplicationservices.WorkingDatabase AddHandler ZcDB.Objecterased,AddressOf ObjecterasedEvent End Sub Public Shared Sub ObjecterasedEvent(ByVal sender As Object,ByVal e As ObjecterasedEventArgs) Application.ShowAlertDialog(vbLf & "Object(s) erased") End Sub End Class End Namespace