WPF：从另一个线程访问UI元素

Question

尝试执行动画时，获取System.InvalidOperationException（“调用线程无法访问该对象，因为此对象的所有者是另一个线程。”）。

Thread t = new Thread(new ThreadStart(DoPointsShift)); 
t.Start(); 

private void DoPointsShift() 
     { 
      int turnsPerMinute = 5; 
      long delay = 60/turnsPerMinute * 1000/(360/2); 
      long deltaDelay = delay; 

     int beginTime = Environment.TickCount; 
     EasingFunctionBase ease = new CircleEase(); 
     ease.EasingMode = EasingMode.EaseInOut; 
     while (true) 
     { 
      TimeSpan duration = TimeSpan.FromSeconds(1 - 1 * rnd.NextDouble()); 
      foreach (var p in points) 
      { 
       var x = p.OriginX - 50 + rnd.NextDouble() * 100; 
       var y = p.OriginY - 50 + rnd.NextDouble() * 100; 
       PointAnimation anim = new PointAnimation(new Point(x, y), duration); 
       anim.EasingFunction = ease; 
       Dispatcher.BeginInvoke(new Action(() => 
       { 
        p.BeginAnimation(ParallaxPoint.PointCoordProperty, anim); //exception here 
       })); 
      } 
      while (Environment.TickCount - beginTime < delay) { } 
      delay += deltaDelay; 
     } 
    } 

有什么想法吗？

Answer 1

尝试用包裹函数体：

var dispatcher = Application.Current.Dispatcher; 
dispatcher.Invoke((Action)(() => 
{ 

    //your code here 

})); 

如：

private void DoPointsShift() 
    { 
     var dispatcher = Application.Current.Dispatcher; 
     dispatcher.Invoke((Action)(() => 
     { 
      int turnsPerMinute = 5; 
      long delay = 60/turnsPerMinute * 1000/(360/2); 
      long deltaDelay = delay; 

      int beginTime = Environment.TickCount; 
      EasingFunctionBase ease = new CircleEase(); 
      ease.EasingMode = EasingMode.EaseInOut; 
      while (true) 
     { 
     TimeSpan duration = TimeSpan.FromSeconds(1 - 1 * rnd.NextDouble()); 
     foreach (var p in points) 
     { 
      var x = p.OriginX - 50 + rnd.NextDouble() * 100; 
      var y = p.OriginY - 50 + rnd.NextDouble() * 100; 
      PointAnimation anim = new PointAnimation(new Point(x, y), duration); 
      anim.EasingFunction = ease; 
      Dispatcher.BeginInvoke(new Action(() => 
      { 
       p.BeginAnimation(ParallaxPoint.PointCoordProperty, anim); //exception here 
      })); 
     } 
      while (Environment.TickCount - beginTime < delay) { } 
      delay += deltaDelay; 
     } 
    })); 
} 

杰夫