WPF中触发器（Trigger、DataTrigger）使用动画最简单的方式EnterActions和ExitsActions

1.当鼠标移入后执行某个动画：

<Style TargetType="{x:Type StackPanel}">
                            <Setter Property="RenderTransform">
                                <Setter.Value>
                                    <TranslateTransform X="{Binding ElementName=borderContent,Path=ActualWidth}"/>
                                </Setter.Value>
                            </Setter>

                            <Style.Triggers>
                                <Trigger Property="IsMouseOver" Value="True">
                                    <Trigger.EnterActions>
                                        <BeginStoryboard>
                                            <Storyboard>
                                                <DoubleAnimation To=""  Duration="0:0:0.2" AccelerationRatio="0.5"  Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.X)"/>
                                            </Storyboard>
                                        </BeginStoryboard>
                                    </Trigger.EnterActions>
                                    <Trigger.ExitActions>
                                        <BeginStoryboard>
                                            <Storyboard>
                                                <DoubleAnimation Duration="0:0:0.2" AccelerationRatio="0.5" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.X)"/>
                                            </Storyboard>
                                        </BeginStoryboard>
                                    </Trigger.ExitActions>
                                </Trigger>
                            </Style.Triggers>
                        </Style>

详细代码：http://www.cnblogs.com/tommy-huang/p/5714863.html

2.当绑定的属性等于某个数值时的动画

 <DataTrigger Binding="{Binding Tag,RelativeSource={RelativeSource Self},Converter={StaticResource DictionaryConverter},ConverterParameter=Type}" Value="Scan">
                            <DataTrigger.EnterActions>
                                <BeginStoryboard>
                                    <Storyboard RepeatBehavior="Forever" x:Name="leftRightSB">
                                        <DoubleAnimation Storyboard.TargetName="tt" Storyboard.TargetProperty="(TranslateTransform.X)" From="0" To="10" Duration="0:0:0.3" BeginTime="0:0:0.0"/>
                                        <DoubleAnimation Storyboard.TargetName="tt" Storyboard.TargetProperty="(TranslateTransform.X)" From="10" To="0" Duration="0:0:0.3" BeginTime="0:0:0.3"/>
                                        <DoubleAnimation Storyboard.TargetName="tt" Storyboard.TargetProperty="(TranslateTransform.X)" From="0" To="-10" Duration="0:0:0.3" BeginTime="0:0:0.6"/>
                                        <DoubleAnimation Storyboard.TargetName="tt" Storyboard.TargetProperty="(TranslateTransform.X)" From="-10" To="0" Duration="0:0:0.3" BeginTime="0:0:0.9 "/>
                                    </Storyboard>
                                </BeginStoryboard>
                            </DataTrigger.EnterActions>
                            <DataTrigger.ExitActions>
                                <BeginStoryboard>
                                    <Storyboard RepeatBehavior="Forever">
                                        <DoubleAnimation Storyboard.TargetName="tt" Storyboard.TargetProperty="(TranslateTransform.Y)" To="0" Duration="0:0:0.01"/>
                                    </Storyboard>
                                </BeginStoryboard>
                            </DataTrigger.ExitActions>
                        </DataTrigger>

**特别注意：

由于EventTrigger本身就是路由事件触发器，路由事件可以通过VS查阅API获得，

查询的方式，如：

　　　　Button通过F12看到按钮的公开代码，Button自身没有RoutedEvent，然后查询其父类ButtonBase，有一个ClickEvent;

再查询ButtonBase的父类ContentControl...一直到UIElement类，你就会发现很多RoutedEvent。

EnterActions和ExitActions不能用于EventTrigger，否则会报错Event triggers do not support EnterActions or ExitActions.