C＃情節提要Begin（）未觸發

Question

我通過<Viewbox>在畫布上有大約50個<Path>元素。 <Viewbox>也被嵌套。 當它們的位置與傳感器數據位置匹配時，我想更改<Path>的不透明度。 該代碼一直運行到Begin（）方法。 它不會給出錯誤，它不會執行任何操作。 我也嘗試創建其他NameScopes但是無法指出正確的namspace。 比其他任何this並不使它的開始（）方法。 如果我在if語句內創建一個新的Scope：“ if (wantedNode is System.Windows.Shapes.Path) ”，它將使其一次進入Begin（），不會觸發，並且永遠不會回來！

if (angle > 0)
        { 
            if (angle <= 180 && angle > 150)
            {
                if (mag <= sweetSpot)
                {
                    //posAlertTxt.Text = "On target...";
                }
                else if (mag <= step)
                {
                    selectedStep = "step0108";
                }
                else if (mag <= step * 2)
                .
                .
                .
                .

覆蓋所有角度和大小后：

 redBrush.Color = Colors.IndianRed;

            System.Windows.Media.Animation.DoubleAnimation opacityAnimation = new System.Windows.Media.Animation.DoubleAnimation();

            opacityAnimation.To = 1.0;
            opacityAnimation.Duration = TimeSpan.FromSeconds(1);
            opacityAnimation.AutoReverse = true;

            RegisterName("redBrush", redBrush);

            Storyboard sb = new System.Windows.Media.Animation.Storyboard();

            Storyboard.SetTargetName(opacityAnimation, "redBrush");
            Storyboard.SetTargetProperty(opacityAnimation, new PropertyPath(SolidColorBrush.OpacityProperty));

            sb.Children.Add(opacityAnimation);

            object wantedNode = indicatorBounds.FindName(selectedStep);
            if (wantedNode is System.Windows.Shapes.Path){   
                System.Windows.Shapes.Path wantedChild = wantedNode as System.Windows.Shapes.Path;
                wantedChild.Fill = redBrush;
                //System.Diagnostics.Debug.WriteLine(wantedChild.Opacity);          
                sb.Begin(this);

最后，XAML：

.
.
. 
.
<Viewbox Name="forceGradientContainer"  Width="126" Height="457"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Canvas.Left="117" Canvas.Top="17">
   <Canvas  Name="indicatorBounds" Width="126.378" Height="457.004">
        <Canvas Name="holder">
            .
            .
            .
            .
             <Path Fill="IndianRed" Opacity="0" x:Name="step0108" Data="F1 M 28.802,209.027 L     49.252,221.067 C 47.922,223.377 47.162,226.057 47.162,228.917 L 23.432,228.917 C 23.432,221.667 25.392,214.867 28.802,209.027 Z"/>`
            .
            .
            .
         </Canvas>    
     </Canvas>
</Viewbox>

Answer 1

嘗試

Storyboard.SetTarget(opacityAnimation, redBrush);

代替

RegisterName("redBrush", redBrush);
Storyboard.SetTargetName(opacityAnimation, "redBrush");

而且為什么不只為元素本身的不透明度設置動畫呢？

Storyboard.SetTarget(opacityAnimation, wantedChild);
Storyboard.SetTargetProperty(opacityAnimation, new PropertyPath("Opacity"));