使用特定值动画ProgressBar内容WPF

Question

我正在尝试开发一个ProgressBar ，它相应地填充我手动设置的值。 例如，我有这个ProgressBar ：

<ProgressBar Height="33" HorizontalAlignment="Left" Name="progressBar1" VerticalAlignment="Top" Width="285" />

我有一个按钮，每按一次就会增加10个单位的ProgressBar值，如下所示：

private void button1_Click(object sender, RoutedEventArgs e)
{
    progressBar1.Value += 10;
}

我希望每次点击它时都会对该值进行动画处理。 我试过这个：

Duration duration = new Duration(TimeSpan.FromSeconds(1));
DoubleAnimation doubleanimation = new DoubleAnimation(200.0, duration);
progressBar1.BeginAnimation(ProgressBar.ValueProperty, doubleanimation);

但它从ProgressBar 0到100值。 如何告诉动画停止特定值，而不是100％？

Answer 1

如果您执行以下操作，您实际上将Value设置为最终值200的动画：

DoubleAnimation doubleanimation = new DoubleAnimation(200.0, duration);

而是将第一个参数更改为要设置为动画的值。 您的事件处理程序应如下所示：

private void button1_Click(object sender, RoutedEventArgs e)
{
    Duration duration = new Duration(TimeSpan.FromSeconds(1));
    DoubleAnimation doubleanimation = new DoubleAnimation(progressBar1.Value + 10, duration);
    progressBar1.BeginAnimation(ProgressBar.ValueProperty, doubleanimation);
}

Answer 2

DoubleAnimation Constructor (Double, Duration)是第一个参数

动画的目标值。

所以改变这个

DoubleAnimation doubleanimation = new DoubleAnimation(200.0, duration);

至

DoubleAnimation doubleanimation = new DoubleAnimation(progressBar1.Value, duration);

Answer 3

对于那些感兴趣的人，我在这个链接中找到了一个解决方案。 它解释了如何使用BackgroundWorker填充ProgressBar值。

我写了这段代码：

 public MainWindow()
 {
    InitializeComponent();

    backgroundworker.WorkerReportsProgress = true;
    backgroundworker.WorkerSupportsCancellation = true;
    backgroundworker.DoWork += backgroundworker_DoWork;
    backgroundworker.ProgressChanged += backgroundworker_ProgressChanged;
}

private void buttonStop_Click(object sender, RoutedEventArgs e)
{
    backgroundworker.CancelAsync();
    e.Handled = true;
}

private void buttonStart_Click(object sender, RoutedEventArgs e)
{
    if (backgroundworker.IsBusy == false)
    {
       backgroundworker.RunWorkerAsync();
    }
    e.Handled = true;
}

void backgroundworker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    progressBar1.Value = e.ProgressPercentage;
}

void backgroundworker_DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;
    if (worker != null)
    {
        for (int i = 0; i <= 10; i++)
        {
            if (worker.CancellationPending)
            {
                e.Cancel = true;
                break;
            }

            System.Threading.Thread.Sleep(50);
            worker.ReportProgress(i);
        }
    }
}