WPF 进度条在几个条后停止 [英] WPF Progressbar Stops after a Few Bars

问题描述

在我的 WPF 应用程序中，我必须在计时器滴答事件中显示进度条进度，我正在编写如下，

In my WPF application i have to show a progressbar progress with in a timer tick event, which i am writing as below,

System.Windows.Forms.Timer timer;
public MainWindow()
{
    timer = new System.Windows.Forms.Timer();
    timer.Interval = 1000;
    this.timer.Tick += new System.EventHandler(this.timer_Tick);
}

加载事件如下

private void Window_Loaded(object sender, RoutedEventArgs e)
{
      progressBar1.Minimum = 0;
      progressBar1.Value = DateTime.Now.Second;
      progressBar1.Maximum = 700;
      timer.Start();         
 }

最后在tick事件中，

And at last in tick event,

private void timer_Tick(object sender, EventArgs e)
{
    Duration duration = new Duration(TimeSpan.FromSeconds(20));

    //progress bar animation
    System.Windows.Media.Animation.DoubleAnimation doubleanimation = new    System.Windows.Media.Animation.DoubleAnimation(200.0, duration);
    progressBar1.BeginAnimation(ProgressBar.ValueProperty, doubleanimation);
}

当程序的进度条显示两到三个条的进度然后停止增加时.后来进度完全没有影响.

When the program's progressbar shows the progress for two-three bars and then it stops increment. Later there is no effect in the progress at all.

为什么?

推荐答案

在我的 WPF 应用程序中，我有... System.Windows.Forms.Timer timer;

In my WPF application I have ... System.Windows.Forms.Timer timer;

那是错误的计时器类型.改用 DispatcherTimer.

That is the wrong type of timer. Use a DispatcherTimer instead.

当我执行我的程序时，progressbar 会显示 2-3 bar 的进度，然后它就停止了

When i execute my program progressbar shows the progress for two-three bars and then it stops

这让我很惊讶，我根本没想到它会起作用.这意味着您可能还有其他问题，例如阻塞主(调度程序)线程.

This surprises me, I wouldn't have expected it to work at all. This means you may have other problems too, like blocking the main (dispatcher) thread.

您只需在 Loaded 事件中设置一次值:

You are only setting the Value once, in the Loaded event:

     progressBar1.Value = DateTime.Now.Second;

Tick 事件中的 progressBar1.Value 没有变化.所以它认为它停止移动了.

There is no change to progressBar1.Value in the Tick event. So it figures that it stops moving.

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