如何在後臺運行任務時在WPF中旋轉圖像？

Question

我有一個WPF應用程序，其中一個啓動按鈕執行一些Web服務調用，它返回一些結果，我使用oxyplot在圖上繪製。我在UI上有一個圖像，我希望將其用作「微調器」，直到任務完成。

我可以使用按鈕點擊路由事件旋轉我的圖像，但我希望它保持旋轉，直到我的Web服務調用完成。有什麼建議麼？

<Button.Triggers> 
      <EventTrigger RoutedEvent="Button.Click"> 
       <BeginStoryboard> 
        <Storyboard> 
         <DoubleAnimation Storyboard.TargetName="capIcon" Storyboard.TargetProperty="RenderTransform.Angle" By="90" Duration="0:0:1" /> 
         <DoubleAnimation Storyboard.TargetName="capIcon" Storyboard.TargetProperty="RenderTransform.Angle" By="90" Duration="0:0:1" /> 
         <DoubleAnimation Storyboard.TargetName="capIcon" Storyboard.TargetProperty="RenderTransform.Angle" By="90" Duration="0:0:1" /> 
         <DoubleAnimation Storyboard.TargetName="capIcon" Storyboard.TargetProperty="RenderTransform.Angle" By="90" Duration="0:0:1" /> 
        </Storyboard> 
       </BeginStoryboard> 
      </EventTrigger> 
     </Button.Triggers> 

，這裏是我的按鈕單擊方法：

 private void Button_Click_1(object sender, RoutedEventArgs e) 
    { 
     if (!validateThreadCount()) 
     return; 

     RunTimes.runTimes.Clear(); 
     //this.Plot.InvalidateFlag = 1; 
     int threads = Convert.ToInt16(this.ThreadCount.Text); 

     Task[] tasks = new Task[threads]; 
     for (int i = 0; i < threads; i++) 
     { 
      DealClient dealClient = new DealClient(); 
      var t = Task.Factory.StartNew(() => dealClient.NewDeal(1)); 
      tasks[i] = t; 
     } 

     Task.WaitAll(tasks); 

     var points = new List<ScatterPoint>(); 
     for (int i = 0; i < RunTimes.runTimes.Count; i++) 
     { 
      points.Add(new ScatterPoint(RunTimes.runTimes[i].Milliseconds, i, 3)); 
     } 

     this.pts.ItemsSource = points; 

    } 

Answer 1

你需要使用一個異步和等待方法，可處理該事件。我沒有足夠的代碼來給你正確的名字，但是這是我會怎樣處理這個問題

Private async Task MethodThatHandlesEvent() 
{ 
await Task.Run(() => 
    { 
     RunWebService(); 
      While(WebServiceIsRunning) 
      {MakeImagesSpin();} 
    }); 
} 

Private async void MyButton_Click() 
{ 
    await MethodThatHandlesEvent(); 
}