为什么我的用户控件崩溃了Visual Studio？

我花了一整天时间试图弄清楚为什么这个用户控件崩溃VS2010（Windows Phone 7.1开发）。 应用程序运行此控件没有问题，但是当我在MainPage.xaml中进入设计模式时 – VS崩溃。

                        Visible     Collapsed     Visible     Visible     Visible                                   

而现在的代码。

 namespace blabla.Controls { public partial class Tile : UserControl { /// 
 /// Defines if the tile has two sides. /// 
 public bool IsTwoSided { get { return (bool)GetValue(IsTwoSidedProperty); } set { SetValue(IsTwoSidedProperty, value); this.startAnimations(); } } /// 
 /// Image that will be displayed on front side. /// 
 public BitmapImage FrontImage { get { return (BitmapImage)GetValue(FrontImageProperty); } set { SetValue(FrontImageProperty, value); } } /// 
 /// Image that ill be displayed on back side. /// 
 public BitmapImage BackImage { get { return (BitmapImage)GetValue(BackImageProperty); } set { SetValue(BackImageProperty, value); } } /// 
 /// Brush that will be used as background for front side. /// 
 public Brush FrontBackground { get { return (Brush)GetValue(FrontBackgroundProperty); } set { SetValue(FrontBackgroundProperty, value); } } /// 
 /// Brush that will be used as background for back side. /// 
 public Brush BackBackground { get { return (Brush)GetValue(BackBackgroundProperty); } set { SetValue(BackBackgroundProperty, value); } } /////////////////////////////////////////////////////////////////////////////////////////////////////// public static readonly DependencyProperty IsTwoSidedProperty = DependencyProperty.Register("IsTwoSided", typeof(bool), typeof(Tile), new PropertyMetadata(false)); public static readonly DependencyProperty FrontImageProperty = DependencyProperty.Register("FrontImage", typeof(BitmapImage), typeof(Tile), new PropertyMetadata(null)); public static readonly DependencyProperty BackImageProperty = DependencyProperty.Register("BackImage", typeof(BitmapImage), typeof(Tile), new PropertyMetadata(null)); public static readonly DependencyProperty FrontBackgroundProperty = DependencyProperty.Register("FrontBackground", typeof(Brush), typeof(Tile), new PropertyMetadata(new SolidColorBrush((Color)Application.Current.Resources["PhoneAccentColor"]))); public static readonly DependencyProperty BackBackgroundProperty = DependencyProperty.Register("BackBackground", typeof(Brush), typeof(Tile), new PropertyMetadata(new SolidColorBrush((Color)Application.Current.Resources["PhoneAccentColor"]))); /////////////////////////////////////////////////////////////////////////////////////////////////////// public Tile() { InitializeComponent(); this.LayoutRoot.DataContext = this; } /////////////////////////////////////////////////////////////////////////////////////////////////////// /// 
 /// Modifies animation frames' KeyTime to adjust time for new timing. /// Lenght of the pause. /// 
 private void setPauses(TimeSpan pauseTime) { // Sets pauses. EasingDoubleKeyFrame frameToModify; for(int i = 0; true; i++) { if(this.FindName("MoveThisForPause" + i) != null) { frameToModify = (EasingDoubleKeyFrame)this.FindName("MoveThisForPause" + i); frameToModify.KeyTime = KeyTime.FromTimeSpan(frameToModify.KeyTime.TimeSpan - TimeSpan.FromSeconds(5) + pauseTime); } else { break; } } } /// 
 /// Starts animations. /// 
 /// Usually delay before first-time animation. private void startAnimations() { // We start animations only if the tile is two sided. if(this.IsTwoSided) { // Stopping previous animation. this.SwitchSidesAnimation.Stop(); // Sets correct pauses. this.setPauses(TimeSpan.FromSeconds(new Random().Next(5, 10))); // Starts animation. this.SwitchSidesAnimation.BeginTime = TimeSpan.FromSeconds(new Random().Next(2, 15)); this.SwitchSidesAnimation.RepeatBehavior = RepeatBehavior.Forever; this.SwitchSidesAnimation.Begin(); } else { this.SwitchSidesAnimation.Stop(); } } } } 

  public static readonly DependencyProperty FrontBackgroundProperty = DependencyProperty.Register("FrontBackground", typeof(Brush), typeof(Tile), new PropertyMetadata(new SolidColorBrush((Color)Application.Current.Resources["PhoneAccentColor"]))); public static readonly DependencyProperty BackBackgroundProperty = DependencyProperty.Register("BackBackground", typeof(Brush), typeof(Tile), new PropertyMetadata(new SolidColorBrush((Color)Application.Current.Resources["PhoneAccentColor"]))); 

  /// 
 /// Defines if the tile has two sides. /// 
 public bool IsTwoSided { get { return (bool)GetValue(IsTwoSidedProperty); } set { SetValue(IsTwoSidedProperty, value); this.startAnimations(); } } 

  this.Resources["SwitchSidesAnimation"] as Storyboard 

  private Storyboard SwitchSidesAnimation { get { return this.Resources["SwitchSidesAnimation"] as Storyboard; } } 

  public static readonly DependencyProperty MyStyleProperty = DependencyProperty.Register( "MyStyle", typeof(Style), typeof(MainButton), new PropertyMetadata( // using this construct as a default value // makes VS 2010 SP1 to crush! Application.Current.Resources["SomeStyle"] as Style, OnPropertyChanged ) );