c# - WPF Storyboard 死亡

C＃：

public partial class MainWindow : Window
{
    Storyboard a = new Storyboard();
    int i;
    public MainWindow()
    {
        InitializeComponent();
        a.Completed += new EventHandler(a_Completed);
        a.Duration = TimeSpan.FromMilliseconds(10);
        a.Begin();
    }

    void a_Completed(object sender, EventArgs e)
    {
        textblock.Text = (++i).ToString();
        a.Begin();
    }
}

XAML：

<Window x:Class="Gui.MainWindow" x:Name="control"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="300" Width="300">
<Canvas>
    <TextBlock Name="textblock"></TextBlock>
</Canvas>

此代码有什么问题？
情节提要在20-50轮后停止。每次不同的数字

最佳答案

我相信这是因为在您的代码中，情节提要的动画时钟与TextBlock的Text DependencyProperty之间没有建立任何关系。如果我不得不猜测讲故事板的时间，那是由于对DependencyProperty（TextBlock.Text是DependencyProperty）更新管道造成污染而在某个随机的时间进行的。创建如下所示的关联（RunTimeline或RunStoryboard都可以使用，但是显示了查看此关联的替代方法）：

public partial class Window1 : Window
{
    Storyboard a = new Storyboard();
    StringAnimationUsingKeyFrames timeline = new StringAnimationUsingKeyFrames();
    DiscreteStringKeyFrame keyframe = new DiscreteStringKeyFrame();

    int i;

    public Window1()
    {
        InitializeComponent();

        //RunTimeline();
        RunStoryboard();
    }

    private void RunTimeline()
    {
        timeline.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath("(TextBlock.Text)"));
        timeline.Completed += timeline_Completed;
        timeline.Duration = new Duration(TimeSpan.FromMilliseconds(10));
        textblock.BeginAnimation(TextBlock.TextProperty, timeline);
    }

    private void RunStoryboard()
    {
        timeline.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath("(TextBlock.Text)"));
        a.Children.Add(timeline);
        a.Completed += a_Completed;
        a.Duration = new Duration(TimeSpan.FromMilliseconds(10));
        a.Begin(textblock);
    }

    void timeline_Completed(object sender, EventArgs e)
    {
        textblock.Text = (++i).ToString();
        textblock.BeginAnimation(TextBlock.TextProperty, timeline);
    }

    void a_Completed(object sender, EventArgs e)
    {
        textblock.Text = (++i).ToString();
        a.Begin(textblock);
    }
}

只要我允许它运行，它就对我有效（约比其他时间长10倍）。

提姆

关于c# - WPF Storyboard 死亡，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/315427/