當需要集合里面某個數據變化的時候進行動畫，用到了DataTrigger,其中可以用到DataTrigger.EnterActions來實現。

與之配對的有一個<DataTrigger.ExitActions>。

EnterActions關于其中msdn解釋為：Gets a collection of TriggerAction objects to apply when the trigger object becomes active。沒看明白？

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??????????????? <DataTrigger Binding="{Binding IsShow}"? Value="True">
??????????????????? <DataTrigger.EnterActions>
??????????????????????? <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>???????????????????????
??????????????????? </DataTrigger.EnterActions>
??????????????????? <DataTrigger.ExitActions>
??????????????????????? <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>
??????????????????? </DataTrigger.ExitActions>
??????????????? </DataTrigger>

剛開始我以為綁定了以上還應該進行對應當返回動作如下：

??????????????? <DataTrigger Binding="{Binding IsShow}"? Value="false">
??????????????????? <DataTrigger.EnterActions>
??????????????????????? <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>???????????????????????
??????????????????? </DataTrigger.EnterActions>
??????????????????? <DataTrigger.ExitActions>
??????????????????????? <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>
??????????????????? </DataTrigger.ExitActions>
??????????????? </DataTrigger>

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后面經過實驗，只進行第一次即可。IsShow是一個屬性，bool類型。理解為：當true即enter,false的時候就Exit

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DataTrigger 一些新知識