原來(lái)的需求是控件可見(jiàn)時(shí)有動(dòng)畫(huà)，不可見(jiàn)的時(shí)候沒(méi)有動(dòng)畫(huà)，只寫(xiě)了EnterAction，沒(méi)寫(xiě)ExitAction,以為空間都隱藏了，總不會(huì)再有動(dòng)畫(huà)了。剛好該動(dòng)畫(huà)在一個(gè)攝像頭獲取的視頻上面，動(dòng)畫(huà)期間視頻有點(diǎn)卡，動(dòng)畫(huà)隱藏了，視頻還是卡，于是弄了一下測(cè)試，發(fā)現(xiàn)不寫(xiě)ExitAction動(dòng)畫(huà)還是在動(dòng)的。

    <StackPanel>

        <TextBox  Name="tb" Text="1">
        </TextBox>
       
        <Button Focusable="False" Content="Button">
            <Button.RenderTransform>
                <ScaleTransform ScaleX="0.5"></ScaleTransform>
            </Button.RenderTransform>
            <Button.Style>
                <Style TargetType="Button">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=tb,Path=Text}" Value="1">
                            <DataTrigger.EnterActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation Storyboard.TargetProperty="(Button.RenderTransform).(ScaleTransform.ScaleX)" From="0.5" To="1" RepeatBehavior="Forever"></DoubleAnimation>
                                    </Storyboard>
                                </BeginStoryboard>
                            </DataTrigger.EnterActions>
                            <DataTrigger.ExitActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation Storyboard.TargetProperty="(Button.RenderTransform).(ScaleTransform.ScaleX)"  To="0.6" ></DoubleAnimation>
                                    </Storyboard>
                                </BeginStoryboard>
                            </DataTrigger.ExitActions>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
        </Button>

    </StackPanel>