我之前在控制台窗口中看到过“undefined”，但我可以弄明白它的含义。这一次，我在CollectionEvent (super(type, bubbles, cancelable);）的构造函数的开头行中得到它。我认为它是由对XMLListCollection的写入触发的。似乎没有任何未定义的东西 - this指针看起来很好，所有参数都可以。它有一个很大的堆栈跟踪，但没有关于什么是未定义的有用信息。如何进入下一个调试步骤？
undefined
at mx.events::CollectionEvent()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\events\CollectionEvent.as:116]
at mx.collections::ListCollectionView/handlePropertyChangeEvents()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1245]
at mx.collections::ListCollectionView/listChangeHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1120]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.collections::XMLListAdapter/itemUpdateHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:523]
at mx.collections::XMLListAdapter/itemUpdated()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:321]
at mx.collections::XMLListAdapter/xmlNotification()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:620]
at Function/()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\utils\XMLNotifier.as:81]
at AddressNode/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressNode.as:192]
at AddressTree/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressTree.as:37]
at UMTAControl/ValidateDisplayLines_()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:90]
at UMTAControl/OnChangeXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:82]
at UMTAControl/OnChXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:79]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.collections::ListCollectionView/dispatchEvent()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:879]
at mx.collections::ListCollectionView/handlePropertyChangeEvents()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1248]
at mx.collections::ListCollectionView/listChangeHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1120]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.collections::XMLListAdapter/itemUpdateHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:523]
at mx.collections::XMLListAdapter/itemUpdated()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:321]
at mx.collections::XMLListAdapter/xmlNotification()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:620]
at Function/()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\utils\XMLNotifier.as:81]
at AddressNode/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressNode.as:192]
at AddressTree/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressTree.as:37]
at UMTAControl/ValidateDisplayLines_()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:90]
at UMTAControl/OnChangeXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:82]
at UMTAControl/OnChXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:79]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.collections::ListCollectionView/dispatchEvent()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:879]
at mx.collections::ListCollectionView/handlePropertyChangeEvents()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1248]
at mx.collections::ListCollectionView/listChangeHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1120]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.collections::XMLListAdapter/itemUpdateHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:523]
at mx.collections::XMLListAdapter/itemUpdated()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:321]
at mx.collections::XMLListAdapter/xmlNotification()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:620]
at Function/()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\utils\XMLNotifier.as:81]
at AddressNode/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressNode.as:192]
at AddressTree/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressTree.as:37]
at UMTAControl/ValidateDisplayLines_()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:90]
at UMTAControl/OnChangeXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:82]
at UMTAControl/OnChXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:79]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.collections::ListCollectionView/dispatchEvent()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:879]
at mx.collections::ListCollectionView/handlePropertyChangeEvents()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1248]
at mx.collections::ListCollectionView/listChangeHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1120]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.collections::XMLListAdapter/itemUpdateHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:523]
at mx.collections::XMLListAdapter/itemUpdated()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:321]
at mx.collections::XMLListAdapter/xmlNotification()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\collections\XMLListAdapter.as:620]
at Function/()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\utils\XMLNotifier.as:81]
at AddressNode/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressNode.as:192]
at AddressTree/DisplayLinesInLabels()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\AddressTree.as:37]
at UMTAControl/ValidateDisplayLines_()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:90]
at UMTAControl/OnChangeXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:82]
at UMTAControl/OnChXML()[C:\Users\PL\Documents\projects\AMHS-FlexProject\src\ubimex\modules\MTARoutingControl\UMTAControl.as:79]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
答案 0 :(得分：0)
那是对的，＆＃34;未定义的其他实例＆＃34;都是由于无限递归导致堆栈溢出（而不是提供深思熟虑反馈的那种）。
我想象这些回调类似于MFC模型，其中消息排队并且仅在应用程序开发人员的代码执行完毕时处理（并且我认为重复的消息有时可能已合并）。显然，这不是发生了什么 - 正在进行更改并立即执行回调。我想我无法可靠地检测到XMLListCollection的变化:(
谢谢你们。