C＃WPF錯誤（System.InvalidOperationException）

Question

namespace WpfApplication1 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window 
    { 
     Random random = new Random(); 

     public MainWindow() 
     { 
      InitializeComponent(); 
     } 

     private void startButton_Click(object sender, RoutedEventArgs e) 
     { 
      addEnemy(); 
     } 

     private void addEnemy() 
     { 
      ContentControl enemy = new ContentControl(); 
      enemy.Template = Resources["EnemyTemplate"] as ControlTemplate; 
      AnimateEnemy(enemy, 0, playArea.ActualWidth - 100, "(canvas.left)"); 
      AnimateEnemy(enemy, random.Next((int)playArea.ActualHeight - 100), 
       random.Next((int)playArea.ActualHeight - 100), "(canvas.top)"); 
      playArea.Children.Add(enemy); 
     } 

     private void AnimateEnemy(ContentControl enemy, double from, double to, string propertyToAnimate) 
     { 
      Storyboard storyboard = new Storyboard() { AutoReverse = true, RepeatBehavior = RepeatBehavior.Forever }; 
      DoubleAnimation animation = new DoubleAnimation() 
      { 
       From = from, 
       To = to, 
       Duration = new Duration(TimeSpan.FromSeconds(random.Next(4, 6))), 
      }; 
      Storyboard.SetTarget(animation, enemy); 
      Storyboard.SetTargetProperty(animation, new PropertyPath(propertyToAnimate)); 
      storyboard.Children.Add(animation); 
       //problem 
      storyboard.Begin(); 
     } 

    } 

$ 我的錯誤（「System.InvalidOperationException」類型的未處理的異常在PresentationFramework.dll

發生

其他信息：無法解析的屬性路徑的所有屬性引用'（canvas.left）'。驗證適用的對象是否支持屬性。）

有人可以幫助我嗎？

Answer 1

屬性名稱區分大小寫。它應該是C anvas。 L eft和C anvas。 牛逼 OP：

private void addEnemy() 
{ 
    ContentControl enemy = new ContentControl(); 
    enemy.Template = Resources["EnemyTemplate"] as ControlTemplate; 
    AnimateEnemy(enemy, 0, playArea.ActualWidth - 100, "(Canvas.Left)"); 
    AnimateEnemy(enemy, random.Next((int)playArea.ActualHeight - 100), 
     random.Next((int)playArea.ActualHeight - 100), "(Canvas.Top)"); 
    playArea.Children.Add(enemy); 
}