FLEX ArrayCollection删除过滤的数据问题解决

一、问题:
ArrayCollection添加过滤器后,部门数据不会被展现,当我删除未展现的数据时,调用removeItemAt()是无法删除的。
二、原因:
 
public function removeItemAt(index:int):Object 
{ 
if (index < 0 || index >= length) 
{ 
var message:String = resourceManager.getString( 
"collections", "outOfBounds", [ index ]); 
throw new RangeError(message); 
} 

var listIndex:int = index; 
if (localIndex) 
{ 
var oldItem:Object = localIndex[index]; 
listIndex = list.getItemIndex(oldItem); 
} 
return list.removeItemAt(listIndex); 
} 

因为var oldItem:Object = localIndex[index];中localIndex是一个未被过滤的数据。
三、解决
ArrayCollection中有list的属性:
 
public function get list():IList 
{ 
return _list; 
} 

_list就是原始数据。
所以如果要在添加了过滤器的ArrayCollection上删除过滤的数据,需要list的帮助。实现代码如下:
 
public function findEmployeeInSource(id:int):OrgEmployee { 
var obj:OrgEmployee = null; 
var list:IList = employees.list; 
var len:int = list.length; 
for (var index:int = 0; index < len; index++) { 
obj = list.getItemAt(index) as OrgEmployee; 
if (obj.id == id) { 
return obj; 
} 
} 
return null; 
} 

public function deleteEmployee(id:int):void { 
var obj:OrgEmployee = findEmployeeInSource(id); 
if (obj != null) { 
var index:int = employees.list.getItemIndex(obj); 
employees.list.removeItemAt(index); 
} 
} 

或者一个函数:
 
public function deleteEmployee(id:int):void { 
var obj:OrgEmployee = null; 
var list:IList = employees.list; 
var len:int = list.length; 
for (var index:int = 0; index < len; index++) { 
obj = list.getItemAt(index) as OrgEmployee; 
if (obj.id == id) { 
list.removeItemAt(index); 
return; 
} 
} 
}