WPF死亡故事板 [英] wpf storyboard death

问题描述

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：

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>

什么是错的代码？后两轮20-50
情节提要停止。每一次不同的号码

What is wrong with this code? the storyboard stops after 20-50 rounds. Every time a different number

推荐答案

我相信这是因为你的代码有没有故事板的动画时钟之间建立关系的TextBlock的文本的DependencyProperty。如果我猜当故事板是conking了，我会说，它是在一个有些随机时间，由于积垢的DependencyProperty（TextBlock.Text是一个的DependencyProperty）更新管道。下面创建这样一个关联关系（无论RunTimeline或RunStoryboard的工作，但显示的看着这个替代方法）：

I believe it's because with your code there is no relation created between the Storyboard's animation clock and the TextBlock's Text DependencyProperty. if I had to guess I would say when the Storyboard was conking out, it was at a somewhat random time due to fouling the DependencyProperty (TextBlock.Text is a DependencyProperty) update pipeline. Creating such an association as below (either RunTimeline or RunStoryboard will work, but show alternate methods of looking at this):

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);
    }
}

这只要我会让工作对我来说它运行（〜长于以往任何时候都走上否则发生故障10次）。

This works for me for as long as I would let it run (~10 times longer than it ever took to conk out otherwise).

添

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