wpf - 在WPF中的Window.Resources中声明EventTrigger不起作用

我是WPF的新手，所以我可能缺少一些重要的知识，但是我尝试过并尝试对以下现象做出解释，但无济于事。
基本上，以下代码有效(显示动画):

    <Window.Resources>
    <Storyboard x:Key="LoadStoryBoard"
AutoReverse="True"
RepeatBehavior="Forever">
        <DoubleAnimationUsingKeyFrames Storyboard.TargetName="button1"
                Storyboard.TargetProperty="(Button.Opacity)">
            <EasingDoubleKeyFrame KeyTime="0:0:0.7" Value="0.4" />
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>
</Window.Resources>
...
<Button x:Name="button1" Grid.Column="0" Grid.Row="1" Style="{StaticResource Load}">
<Button.Triggers>
    <EventTrigger RoutedEvent="Loaded">
                <BeginStoryboard Storyboard="{StaticResource LoadStoryBoard}" />
            </EventTrigger>
</Button.Triggers>
</Button>

但是，当我尝试将eventrigger设置为下面的“加载样式”时，动画不再出现:

    <Window.Resources>
    <Storyboard x:Key="LoadStoryBoard"
AutoReverse="True"
RepeatBehavior="Forever">
        <DoubleAnimationUsingKeyFrames Storyboard.TargetName="button1"
                Storyboard.TargetProperty="(Button.Opacity)">
            <EasingDoubleKeyFrame KeyTime="0:0:0.7" Value="0.4" />
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>
</Window.Resources>
...
<Style x:Key="Load" TargetType="Button">
...
<Style.Triggers>
    ...
    <EventTrigger RoutedEvent="Loaded">
                <BeginStoryboard Storyboard="{StaticResource LoadStoryBoard}" />
            </EventTrigger>
</Style.Triggers>
</Style>

最佳答案

在Style触发器中不能使用带有TargetName的对象，例如动画。为此，将它们放置在触发器模板<ControlTemplate.Triggers>中。引用link:



以下作品:

<Window.Resources>
    <Storyboard x:Key="LoadStoryBoard" AutoReverse="True" RepeatBehavior="Forever">
        <DoubleAnimationUsingKeyFrames Storyboard.TargetName="button1" Storyboard.TargetProperty="(Button.Opacity)">
            <EasingDoubleKeyFrame KeyTime="0:0:0.7" Value="0.4" />
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>

    <Style x:Key="ButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="Background" Value="Green" />
        <Setter Property="Foreground" Value="White" />
        <Setter Property="FontSize" Value="14" />
        <Setter Property="FocusVisualStyle" Value="{x:Null}" />
        <Setter Property="SnapsToDevicePixels" Value="True" />

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border x:Name="button1" CornerRadius="0" Background="{TemplateBinding Background}">
                        <Grid>
                            <ContentPresenter x:Name="MyContentPresenter" Content="{TemplateBinding Content}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,0,0,0" />
                        </Grid>
                    </Border>

                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="Orange" />
                        </Trigger>

                        <EventTrigger RoutedEvent="Button.Loaded">
                            <BeginStoryboard Storyboard="{StaticResource LoadStoryBoard}" />
                        </EventTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>

<Grid>
    <Button Name="TestButton" Style="{StaticResource ButtonStyle}" Width="100" Height="30" Content="Test" Grid.Column="0" Grid.Row="1" />
</Grid>

请注意，现在TargetName中指定的模板中的Border:<Border x:Name="button1" .../>。
Note:或者，您可以仅删除Storyboard.TargetName，因为它触发了不支持的样式。