ArrayCollection与Array的区别

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ArrayCollection实现接口ICollectionView,在Flex的类定义内属于[数据集],他提供更强大的检索、过滤、排序、分类、更新监控等功能。FDK2提供的类似的类还有XMLListCollection

这两者差别在于如果用array在作为data provider绑定于control之上,就无法获得控件的更新,除非控件被重新绘制或者data provider被重新指定,而Collection则是将array的副本存储于Collection类的某个对象之中,其特点是Collection类本身就具备了确保数据同步的方法,例子如下(取自adobe内部工程师training示例,稍有改变)

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
      <mx:Script>
          <![CDATA[
              import mx.collections.ArrayCollection;
              [Bindable]
              public var myArray:Array=["北京","上海","深圳"];
              [Bindable]
              public var myCollection:ArrayCollection=new ArrayCollection(myArray);
              public function addCountryToArray(country:String):void{
                  myArray.push(country);
              }
              public function addCountryToCollection(country:String):void{
                  myCollection.addItem(country);
              }
          ]]>
      </mx:Script>
      <mx:TextInput id="countryTextInput" text="广州"/>
      <mx:Label text="Bound to Array (Raw Object)"/>
      <mx:Button click="addCountryToArray(countryTextInput.text)" label="Add Country to Array"/>
      <mx:List dataProvider="{myArray}" width="200"/>
      <mx:Label text="Bound to Collection"/>
      <mx:Button click="addCountryToCollection(countryTextInput.text)" label="Add Country to Collection"/>
      <mx:List dataProvider="{myCollection}" width="200"/>
</mx:Application>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~来自老王的杂货铺

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