用Uwp中的代码创建故事板

Question

我想从后面的代码创建一个故事板，我想从下面的代码实现以下故事板，

 <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>

我的页面上有一个TextBlock，名称为txtCounter，我试图通过下面的代码实现这一点，

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();
    }

代码正确编译并运行，问题在于关键时间1 txtCounter应该显示2，关键时间2 txtCounter应该显示1，关键时间3 txtCounter应该显示0，但是，它直接显示0（即不显示中间值）。如果我有任何错误，请看看并纠正我。这会有所帮助。谢谢

Answer 1