在Uwp中从代码后台创建故事板

Question

我想从代码背后创建一个故事板，我想从代码背后实现下面的故事板，

 <Storyboard x:Name="Counter_Animation">
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="txtCounter" Storyboard.TargetProperty="(TextBlock.Text)">
            <DiscreteObjectKeyFrame KeyTime="00:00:01" Value="2"/>
            <DiscreteObjectKeyFrame KeyTime="00:00:02" Value="1"/>
            <DiscreteObjectKeyFrame KeyTime="00:00:03" Value="0"/>
        </ObjectAnimationUsingKeyFrames>
    </Storyboard>

在我的页面上有一个名为txtCounter的TextBlock，我试图通过代码实现，如下所示，

private void CounterAnimation()
    {

        Storyboard storyboard = new Storyboard();
        ObjectAnimationUsingKeyFrames anim = new ObjectAnimationUsingKeyFrames();
        anim.BeginTime = TimeSpan.FromSeconds(0);
        DiscreteObjectKeyFrame keyFrames = new DiscreteObjectKeyFrame();
        keyFrames.KeyTime = TimeSpan.FromSeconds(1);
        keyFrames.Value = "2";
        keyFrames.KeyTime = TimeSpan.FromSeconds(2);
        keyFrames.Value = "1";
        keyFrames.KeyTime = TimeSpan.FromSeconds(3);
        keyFrames.Value = "0";
        anim.KeyFrames.Add(keyFrames);

        Storyboard.SetTarget(anim, txtCounter);
        Storyboard.SetTargetProperty(anim, "Text");

        storyboard.Children.Add(anim);

        storyboard.Begin();
    }

代码编译良好并运行的问题是，在关键时间1 txtCounter应该显示2，在关键时间2 txtCounter应该显示1，在关键时间3 txtCounter应该显示0，但它直接显示0(即不显示中间值)。如果我弄错了，请看一下并纠正我。这将help.Thanks

Answer 1

只是在这里写完整的代码，如果有人有更好的想法，那么请建议这对我来说是可行的，

private Storyboard GetCounterAnimation()
    {

        Storyboard storyboard = new Storyboard();
        ObjectAnimationUsingKeyFrames counterAnimation = new ObjectAnimationUsingKeyFrames
        {
            BeginTime = TimeSpan.FromSeconds(0),
        };
        counterAnimation.KeyFrames.Add(new DiscreteObjectKeyFrame { KeyTime = TimeSpan.FromSeconds(1), Value = "2" });
        counterAnimation.KeyFrames.Add(new DiscreteObjectKeyFrame { KeyTime = TimeSpan.FromSeconds(2), Value = "1" });
        counterAnimation.KeyFrames.Add(new DiscreteObjectKeyFrame { KeyTime = TimeSpan.FromSeconds(3), Value = "Inhale" });
        Storyboard.SetTarget(counterAnimation, txtCounter);
        Storyboard.SetTargetProperty(counterAnimation, "Text");
        storyboard.Children.Add(counterAnimation);
        return storyboard;
    }