使用Cleanup方法避免循环引用

DimobjClass2AsClass2

PRivateSubClass_Initialize()
Debug.PrintTypeName(Me)&".Initialize"

SetobjClass2=NewClass2
SetobjClass2.Class1=Me
EndSub

PrivateSubClass_Terminate()
SetobjClass2=Nothing
Debug.PrintTypeName(Me)&".Terminate"
EndSub

　　在Class2中添加如下的代码：

DimobjClass1AsClass1

PublicPropertySetClass1(ByRefNewValueAsClass1)
SetobjClass1=NewValue
EndProperty

PrivateSubClass_Initialize()
Debug.PrintTypeName(Me)&".Initialize"
EndSub

PrivateSubClass_Terminate()
SetobjClass1=Nothing
Debug.PrintTypeName(Me)&".Terminate"
EndSub