wpf textblock上下滚动动画

以下是一个简单的WPF TextBlock上下滚动动画的示例：

首先，在XAML中创建一个TextBlock控件，并定义其样式和初始位置：

<TextBlock x:Name="myTextBlock" Text="This is a long text that needs to be scrolled" 
           Foreground="White" FontSize="20" Margin="10" 
           VerticalAlignment="Top" TextWrapping="Wrap" 
           Style="{StaticResource TextBlockStyle}"/>

然后，在代码中创建一个Storyboard，通过动画来改变TextBlock的垂直偏移量：

private void StartAnimation()
{
    // 获取TextBlock的高度和父容器的高度
    double textBlockHeight = myTextBlock.ActualHeight;
    double containerHeight = ((FrameworkElement)myTextBlock.Parent).ActualHeight;

    // 创建一个从0到-textBlockHeight的DoubleAnimation，持续时间为5秒
    DoubleAnimation doubleAnimation = new DoubleAnimation();
    doubleAnimation.From = 0;
    doubleAnimation.To = -textBlockHeight;
    doubleAnimation.Duration = new Duration(TimeSpan.FromSeconds(5));
    doubleAnimation.RepeatBehavior = RepeatBehavior.Forever;

    // 创建一个Storyboard，并将DoubleAnimation应用于TextBlock的Margin属性
    Storyboard storyboard = new Storyboard();
    Storyboard.SetTarget(doubleAnimation, myTextBlock);
    Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("Margin.Top"));
    storyboard.Children.Add(doubleAnimation);

    // 开始动画
    storyboard.Begin();
}

最后，在窗口加载时调用StartAnimation方法即可启动动画：

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    StartAnimation();
}

完整的XAML和代码示例可以参考以下链接：

https://www.c-sharpcorner.com/article/wpf-textblock-scrolling-animation/