wpf故事板死亡

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:

     

这段代码有什么问题? 故事板在20-50轮之后停止。 每次都有不同的号码

我相信这是因为你的代码在Storyboard的动画时钟和TextBlock的Text DependencyProperty之间没有创建任何关系。 如果我不得不猜测我会说故事板何时出来,那么由于污染DependencyProperty(TextBlock.Text是一个DependencyProperty)更新管道,它在某个随机时间。 创建如下所示的关联(RunTimeline或RunStoryboard将起作用,但显示查看此内容的替代方法):

 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); } } 

只要我让它运行,这对我有用(比以往任何时候都要长10倍)。

蒂姆