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AnimationException in WPF RadBusyIndicator

Environment

Product RadBusyIndicator for WPF
Version 2024.4.1111

Description

AnimationException can be thrown when the RadBusyIndicator is unloaded from the visual tree. For example, drag out a RadPane that contains the indicator from the docking control.

The error message is Cannot animate the 'IsEnabled' property on a 'System.Windows.Controls.ContentControl' using a 'System.Windows.Media.Animation.ObjectAnimationUsingKeyFrames'.

The complete stacktrace is the following:

    System.Windows.Media.Animation.AnimationException: Cannot animate the 'IsEnabled' property on a 'System.Windows.Controls.ContentControl' using a 'System.Windows.Media.Animation.ObjectAnimationUsingKeyFrames'. For details see the inner exception.
     ---> System.InvalidOperationException: The enumerator is not valid because the collection changed.
       at System.Windows.Media.VisualCollection.Enumerator.MoveNext()
       at System.Windows.FrameworkElement.InvalidateForceInheritPropertyOnChildren(DependencyProperty property)
       at System.Windows.UIElement.OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.DependencyObject.CoerceValue(DependencyProperty dp)
       at System.Windows.FrameworkElement.InvalidateForceInheritPropertyOnChildren(DependencyProperty property)
       at System.Windows.UIElement.OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.DependencyObject.CoerceValue(DependencyProperty dp)
       at System.Windows.FrameworkElement.InvalidateForceInheritPropertyOnChildren(DependencyProperty property)
       at System.Windows.UIElement.OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.DependencyObject.CoerceValue(DependencyProperty dp)
       at System.Windows.FrameworkElement.InvalidateForceInheritPropertyOnChildren(DependencyProperty property)
       at System.Windows.UIElement.OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.DependencyObject.CoerceValue(DependencyProperty dp)
       at System.Windows.UIElement.InvalidateForceInheritPropertyOnChildren(Visual v, DependencyProperty property)
       at System.Windows.UIElement.OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.DependencyObject.CoerceValue(DependencyProperty dp)
       at System.Windows.UIElement.InvalidateForceInheritPropertyOnChildren(Visual v, DependencyProperty property)
       at System.Windows.UIElement.OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.DependencyObject.CoerceValue(DependencyProperty dp)
       at System.Windows.UIElement.InvalidateForceInheritPropertyOnChildren(Visual v, DependencyProperty property)
       at System.Windows.UIElement.OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.Media.Animation.AnimationStorage.OnCurrentTimeInvalidated(Object sender, EventArgs args)
       --- End of inner exception stack trace ---
       at System.Windows.Media.Animation.AnimationStorage.OnCurrentTimeInvalidated(Object sender, EventArgs args)

Solution

To work this around, extract and modify the ControlTemplate of RadBusyIndicator.

The exact modification is to replace the ObjectAnimationUsingKeyFrames that animates the (Control.IsEnabled) property.

    <BooleanAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.001" Storyboard.TargetName="Content" Storyboard.TargetProperty="(Control.IsEnabled)">
        <DiscreteBooleanKeyFrame KeyTime="00:00:00">
            <DiscreteBooleanKeyFrame.Value>
                <sys:Boolean>False</sys:Boolean>
            </DiscreteBooleanKeyFrame.Value>
        </DiscreteBooleanKeyFrame>
    </BooleanAnimationUsingKeyFrames>
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