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POCanvas.GetTop() returning NaN
 

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    <p>I've got a Canvas with a few UIElements on. After I've moved them on the canvas by animating the top and left properties, very occasionally a subsiquent call to Canvas.GetTop results in NaN.</p> <p>Am I not 'closing' the animations properly?</p> <p>Here's how I'm doing the move </p> <pre><code>private void InternalMove(double durationMS, FrameworkElement fElement, Point point, EventHandler callback) { _moveElement = fElement; _destination = point; Duration duration = new Duration(TimeSpan.FromMilliseconds(durationMS)); DoubleAnimation moveLeftAnimation = new DoubleAnimation(Canvas.GetLeft(fElement), point.X, duration, FillBehavior.Stop); Storyboard.SetTargetProperty(moveLeftAnimation, new PropertyPath("(Canvas.Left)")); DoubleAnimation moveTopAnimation = new DoubleAnimation(Canvas.GetTop(fElement), point.Y, duration, FillBehavior.Stop); Storyboard.SetTargetProperty(moveTopAnimation, new PropertyPath("(Canvas.Top)")); // Create a storyboard to contain the animation. _moveStoryboard = new Storyboard(); if (callback != null) _moveStoryboard.Completed += callback; _moveStoryboard.Completed += new EventHandler(s1_Completed); _moveStoryboard.Children.Add(moveLeftAnimation); _moveStoryboard.Children.Add(moveTopAnimation); _moveStoryboard.FillBehavior = FillBehavior.Stop; _moveStoryboard.Begin(fElement); } private void s1_Completed(object sender, EventArgs e) { if (_moveStoryboard != null) { _moveStoryboard.BeginAnimation(Canvas.LeftProperty, null, HandoffBehavior.Compose); _moveStoryboard.BeginAnimation(Canvas.TopProperty, null, HandoffBehavior.Compose); } Canvas.SetLeft(_moveElement, _destination.X); Canvas.SetTop(_moveElement, _destination.Y); } </code></pre> <p>thanks</p>
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