wpf 实现窗口淡入

利用wpf的动画功能实现窗口的淡入。

app.xaml

<Application x:Class="EnergeMonitorEVK.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
                <Style x:Key="windowOpacity" TargetType="{x:Type Window}">
            <Style.Triggers>
                <EventTrigger RoutedEvent="Window.Loaded">                                        
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetProperty="Opacity"
                                            From="0.0" To="1.0" Duration="0:0:1"
                                            />
                        </Storyboard>
                    </BeginStoryboard>                                   
                </EventTrigger>               
            </Style.Triggers>
        </Style>

    </Application.Resources>
</Application>

然后在你的window的xaml代码中添加如下代码

Style="{StaticResource windowOpacity}"

在窗口启动的时候就可以看到淡入的效果。在上述代码中的 Duration="0:0:1"表示代码持续时间为1秒，如果需要调整，自己修改。

我想在Style.Triggers中添加如下代码：

<EventTrigger RoutedEvent="Window.Closing">                                       
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetProperty="Opacity"
                                            From="1.0" To="0.0" Duration="0:0:1"
                                            />
                        </Storyboard>
                    </BeginStoryboard>                                  
                </EventTrigger>   

来实现淡出的效果，但是一运行就出错。不知道为何，高手指点。