处理应用程序事件 (.NET) 
应用程序对象事件用于响应应用程序窗口。注册应用程序事件后,它将保持注册状态,直到 AutoCAD 关闭或取消注册该事件。 以下事件可用于 Application 对象: 
 启用 Application 对象事件此示例演示如何向 BeginQuit 事件注册事件处理程序。注册后,在AutoCAD完全关闭之前会显示一个消息框。 VB.NETImports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
 
<CommandMethod("AddAppEvent")> _
Public Sub AddAppEvent()
  AddHandler Application.SystemVariableChanged, AddressOf appSysVarChanged
End Sub
 
<CommandMethod("RemoveAppEvent")> _
Public Sub RemoveAppEvent()
  RemoveHandler Application.SystemVariableChanged, AddressOf appSysVarChanged
End Sub
 
Public Sub appSysVarChanged(ByVal senderObj As Object, _
                            ByVal sysVarChEvtArgs As Autodesk.AutoCAD.ApplicationServices. _
                            SystemVariableChangedEventArgs)
 
  Dim oVal As Object = Application.GetSystemVariable(sysVarChEvtArgs.Name)
 
  '' Display a message box with the system variable name and the new value
  Application.ShowAlertDialog(sysVarChEvtArgs.Name & " was changed." & _
                              vbLf & "New value: " & oVal.ToString())
End Sub
C#using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
[CommandMethod("AddAppEvent")]
public void AddAppEvent()
{
  Application.SystemVariableChanged +=
      new Autodesk.AutoCAD.ApplicationServices.
          SystemVariableChangedEventHandler(appSysVarChanged);
}
 
[CommandMethod("RemoveAppEvent")]
public void RemoveAppEvent()
{
  Application.SystemVariableChanged -=
      new Autodesk.AutoCAD.ApplicationServices.
          SystemVariableChangedEventHandler(appSysVarChanged);
}
 
public void appSysVarChanged(object senderObj, 
                             Autodesk.AutoCAD.ApplicationServices.
                             SystemVariableChangedEventArgs sysVarChEvtArgs)
{
  object oVal = Application.GetSystemVariable(sysVarChEvtArgs.Name);
 
  // Display a message box with the system variable name and the new value
  Application.ShowAlertDialog(sysVarChEvtArgs.Name + " was changed." +
                              "\nNew value: " + oVal.ToString());
}
VBA/ActiveX 代码参考Public WithEvents ACADApp As AcadApplication
 
Sub Example_AcadApplication_Events()
    ' Intialize the public variable (ACADApp)
    '
    ' Run this procedure first
 
    Set ACADApp = ThisDrawing.Application
End Sub
 
Private Sub ACADApp_SysVarChanged(ByVal SysvarName As String, _
                                  ByVal newVal As Variant)
    ' This procedure intercepts an Application SysVarChanged event.
 
    MsgBox (SysvarName & " was changed." & _
            vbLf & "New value: " & newVal)
End Sub
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