blocks|key|2971276|text|编辑：再读一遍问题后，我想我看到你的问题了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2971277|当您将过滤函数应用于ArrayCollection时，您实际上并没有影响ArrayCollection。Flex创建ArrayCollection的副本并将其放入“包装器”中，并且只包含与您的过滤器匹配的记录。这就是为什么你的setter从不被调用的原因。|2971278|如果您在过滤集合上调用ArrayCollection.length，它将显示过滤记录的数量，而不是您开始时的记录总数。如果删除filter函数并调用refresh()方法，则该“包装器”集合也会被删除。|2971279|您不需要做任何特殊的事情就可以获得ArrayCollection的“包装器”副本。每当您使用原始ArrayCollection时，Flex都会自动返回集合的过滤/包装副本。|2971280|This+link有一些额外的信息。|2971281|entityMap|0|LINK|mutability|MUTABLE|url|http://www.albertx.mx/blog/filter-an-arraycollection-and-dont-lose-the-original-data/^0|0|3|0|0|0|0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|10|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|N|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]]]

EDIT: After reading the question again, I think I see your problem.

When you apply a filter function to an ArrayCollection, you're not actually affecting the ArrayCollection. Flex creates a copy of the ArrayCollection and puts it in a "wrapper" and only includes the records that match your filter. This is why your setter is never called.

If you call ArrayCollection.length on the filtered collection it will show the number of the filtered records instead of the total number of records you started with. If you remove the filter function and call the refresh() method, that "wrapper" collection is removed.

You don't need to do anything special to get that "wrapper" copy of the ArrayCollection. Flex automatically returns the filtered/wrapper copy of the collection whenever you use the original ArrayCollection. 

<a href="http://www.albertx.mx/blog/filter-an-arraycollection-and-dont-lose-the-original-data/" rel="nofollow">This link</a> has some additional info.

blocks|key|2971306|text|go+here并阅读源代码|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2971307|编辑|2971308|<mx:Script>
++++<![CDATA[
++++++++import+mx.collections.ArrayCollection;

++++++++[Bindable]
++++++++public+var+myAC:ArrayCollection+=+new+ArrayCollection([{label:"One"},+{label:"Two"},+{label:"Three"},+{label:"Four"}]);

++++++++[Bindable]
++++++++public+var+myAC2:ArrayCollection+=+new+ArrayCollection();

++++++++public+function+removeFilter(e:Event):void{
++++++++++++trace(this.myAC.source.length+)
++++++++++++this.myAC.filterFunction+=+null;
++++++++++++this.myAC.refresh()
++++++++++++trace(this.myAC.source.length+)
++++++++}
++++++++public+function+addFilter(e:Event):void{
++++++++++++trace(this.myAC.source.length+)
++++++++++++this.myAC.filterFunction+=+filterFunc;
++++++++++++this.myAC.refresh()
++++++++++++trace(this.myAC.source.length+)
++++++++}
++++++++public+function+filterFunc(+item:Object+):Boolean{
++++++++++++if(+item.label+==+"One"+)
++++++++++++++++return+true;

++++++++++++if(+item.label+==+"Two"+)
++++++++++++++++return+true;

++++++++++++return+false;
++++++++}
++++++++public+function+copyData(e:Event):void{
++++++++++++myAC2+=+++new+ArrayCollection(+myAC.toArray()+);++
++++++++++++myAC2.refresh()
++++++++}
++++]]>+
</mx:Script>
<mx:Label+text="original+data+with+filter+option"++y="0"/>
<mx:DataGrid+y="26"+id="nameGrid"+dataProvider="{myAC}"+width="200"+height="200"/>
<mx:Button+id="button2"+label="Add+Filter"+click="addFilter(event)"+x="0"+y="234"/>
<mx:Button+id="button3"+y="264"+label="Remove+Filter"+click="removeFilter(event)"/>


<mx:Button+id="button4"+x="289"+y="234"+label="copy+filtered+data"+click="copyData(event)"/>
<mx:Label+text="Copied+filtered+data"++x="300"+y="0"/>
<mx:DataGrid++y="26"+x="287"+id="nameGrid2"+dataProvider="{myAC2}"+width="200"+height="200"/>|code-block|syntax|javascript|2971309|entityMap|0|LINK|mutability|MUTABLE|url|http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/collections/ArrayCollection.html^0|0|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/collections/ArrayCollection.html" rel="nofollow">go here</a> and read up on source 

[EDIT] 

<pre><code>&lt;mx:Script&gt;
 &lt;![CDATA[
 import mx.collections.ArrayCollection;

 [Bindable]
 public var myAC:ArrayCollection = new ArrayCollection([{label:"One"}, {label:"Two"}, {label:"Three"}, {label:"Four"}]);

 [Bindable]
 public var myAC2:ArrayCollection = new ArrayCollection();

 public function removeFilter(e:Event):void{
 trace(this.myAC.source.length )
 this.myAC.filterFunction = null;
 this.myAC.refresh()
 trace(this.myAC.source.length )
 }
 public function addFilter(e:Event):void{
 trace(this.myAC.source.length )
 this.myAC.filterFunction = filterFunc;
 this.myAC.refresh()
 trace(this.myAC.source.length )
 }
 public function filterFunc( item:Object ):Boolean{
 if( item.label == "One" )
 return true;

 if( item.label == "Two" )
 return true;

 return false;
 }
 public function copyData(e:Event):void{
 myAC2 = new ArrayCollection( myAC.toArray() ); 
 myAC2.refresh()
 }
 ]]&gt; 
&lt;/mx:Script&gt;
&lt;mx:Label text="original data with filter option" y="0"/&gt;
&lt;mx:DataGrid y="26" id="nameGrid" dataProvider="{myAC}" width="200" height="200"/&gt;
&lt;mx:Button id="button2" label="Add Filter" click="addFilter(event)" x="0" y="234"/&gt;
&lt;mx:Button id="button3" y="264" label="Remove Filter" click="removeFilter(event)"/&gt;


&lt;mx:Button id="button4" x="289" y="234" label="copy filtered data" click="copyData(event)"/&gt;
&lt;mx:Label text="Copied filtered data" x="300" y="0"/&gt;
&lt;mx:DataGrid y="26" x="287" id="nameGrid2" dataProvider="{myAC2}" width="200" height="200"/&gt;
</code></pre>

blocks|key|1069561|text|它不会调用setter，因为您没有设置该属性。您要做的就是调用getter，这样您就可以从它获取属性来设置它。HRInfoView.filterFunction和HRInfoView.refresh()都调用getter来获取_hrInfoView，然后从中调用函数或属性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1069562|entityMap^0|1J|P|29|K|35|B|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

It's not calling the setter because you're not setting that property. What you're doing is calling the getter so that you can get the property off of it to set that.
Both <code>HRInfoView.filterFunction</code> and <code>HRInfoView.refresh()</code> are calling the getter to get <code>_hrInfoView</code>, then calling functions or properties from that.

I am using this:

<pre><code>private var _hrInfoView:ArrayCollection;
 [Bindable]
 public function get HRInfoView():ArrayCollection
 {
 return _hrInfoView;
 }
 public function set HRInfoView(value:ArrayCollection):void
 {
 _hrInfoView = value;
 }

 private function onFilterByContent(event:ContextMenuEvent):void
 { 
 HRInfoView.filterFunction = processFilter; 
 HRInfoView.refresh();
 //Break point here shows HRInfoView as different what is in line above. Why is setter not called?
}
</code></pre>

When I put breakpoint on setter of HRInfoView, it never gets hit (when I can clearly see in the watch expression that HRInfoView has changed before and after filtering)! Why?
Thanks.

Why is setter of dataprovider not called after filtering an arraycollection using filter function

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用的是：private var _hrInfoView:ArrayCollection; [Bindable] public function get HRInfoView():ArrayCollection  {   return _hrInfoView;   }  public function set HRI...

问为什么使用筛选函数筛选数组集合后不调用dataprovider的setter
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问为什么使用筛选函数筛选数组集合后不调用dataprovider的setterEN