Questions on UI for WPF Forum

5 answers

116 views

Exception when removing Slider from its parent

Hi,

I have a slider with modified template. When I remove the slider from its parent I'm getting following exception. Is there a way to resolve
it?

Thank you,
Ruben

at Telerik.Windows.Controls.RadTickBar.LoadTemplate(Double tickValue) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadTickBar.cs:line 402

at Telerik.Windows.Controls.RadTickBar.CreateTick(Double tickValue) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadTickBar.cs:line 352

at Telerik.Windows.Controls.RadTickBar.DrawTicks() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadTickBar.cs:line 231

at Telerik.Windows.Controls.RadTickBar.OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)

in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadTickBar.cs:line 315

at System.Windows.DependencyObject.OnPropertyChanged(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, OperationType operationType)

at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp)

at System.Windows.StyleHelper.InvalidatePropertiesOnTemplateNode(DependencyObject container, FrameworkObject child, Int32 childIndex, FrugalStructList`1& childRecordFromChildIndex, Boolean isDetach, FrameworkElementFactory templateRoot)

at System.Windows.StyleHelper.ClearTemplateChain(HybridDictionary[] instanceData, FrameworkElement feContainer, FrameworkContentElement fceContainer, List`1 templateChain, FrameworkTemplate oldFrameworkTemplate)

at System.Windows.StyleHelper.ClearGeneratedSubTree(HybridDictionary[] instanceData, FrameworkElement feContainer, FrameworkContentElement fceContainer, FrameworkTemplate oldFrameworkTemplate)

at System.Windows.StyleHelper.DoTemplateInvalidations(FrameworkElement feContainer, FrameworkTemplate oldFrameworkTemplate)

at System.Windows.StyleHelper.UpdateTemplateCache(FrameworkElement fe, FrameworkTemplate oldTemplate, FrameworkTemplate newTemplate, DependencyProperty templateProperty)

at System.Windows.Controls.Control.OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

at System.Windows.DependencyObject.OnPropertyChanged(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, OperationType operationType)

at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp)

at System.Windows.StyleHelper.InvalidateContainerDependents(DependencyObject container, FrugalStructList`1& exclusionContainerDependents, FrugalStructList`1& oldContainerDependents, FrugalStructList`1& newContainerDependents)

at System.Windows.StyleHelper.DoStyleInvalidations(FrameworkElement fe, FrameworkContentElement fce, Style oldStyle, Style newStyle)

at System.Windows.StyleHelper.UpdateStyleCache(FrameworkElement fe, FrameworkContentElement fce, Style oldStyle, Style newStyle, Style& styleCache)

at System.Windows.FrameworkElement.OnStyleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

at System.Windows.DependencyObject.OnPropertyChanged(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, OperationType operationType)

at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp)

at System.Windows.FrameworkElement.UpdateStyleProperty()

at System.Windows.FrameworkElement.InvalidateTreeDependentProperties(TreeChangeInfo parentTreeState, Boolean isSelfInheritanceParent)

at System.Windows.FrameworkElement.OnAncestorChangedInternal(TreeChangeInfo parentTreeState)

at System.Windows.TreeWalkHelper.OnAncestorChanged(FrameworkElement fe, FrameworkContentElement fce, TreeChangeInfo info)

at System.Windows.TreeWalkHelper.OnAncestorChanged(DependencyObject d, TreeChangeInfo info)

at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)

at MS.Internal.PrePostDescendentsWalker`1._VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)

at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)

at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)

at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)

at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)

at MS.Internal.PrePostDescendentsWalker`1._VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)

at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)

at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)

at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)

at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)

at MS.Internal.PrePostDescendentsWalker`1._VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)

at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)

at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)

at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)

at System.Windows.DescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)

at MS.Internal.PrePostDescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)

at System.Windows.TreeWalkHelper.InvalidateOnTreeChange(FrameworkElement fe, FrameworkContentElement fce, DependencyObject parent, Boolean isAddOperation)

at System.Windows.FrameworkElement.OnVisualParentChanged(DependencyObject oldParent)

at System.Windows.Media.Visual.FireOnVisualParentChanged(DependencyObject oldParent)

at System.Windows.Media.Visual.RemoveVisualChild(Visual child)

at System.Windows.Media.VisualCollection.DisconnectChild(Int32 index)

at System.Windows.Media.VisualCollection.RemoveRange(Int32 index, Int32 count)

at System.Windows.Controls.UIElementCollection.RemoveRangeInternal(Int32 index, Int32 count)

at System.Windows.Controls.Panel.removeChildren(GeneratorPosition pos, Int32 containerCount)

at System.Windows.Controls.Panel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)

at System.Windows.Controls.Panel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)

at System.Windows.Controls.ItemContainerGenerator.OnItemRemoved(Object item, Int32 itemIndex)

at System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

at System.Windows.Controls.ItemContainerGenerator.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type managerType, Object sender, EventArgs e)

at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)

at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)

at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)

at System.Windows.Controls.ItemCollection.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type managerType, Object sender, EventArgs e)

at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)

at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)

at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)

at MS.Internal.Controls.InnerItemCollectionView._RemoveAt(Int32 index, Int32 indexR, Object item)

at MS.Internal.Controls.InnerItemCollectionView.RemoveAt(Int32 index)

at System.Windows.Controls.ItemCollection.RemoveAt(Int32 removeIndex)

Slider

answered on 08 Nov 2010

5 answers

142 views

Exception when changing DataContext

Hi,

I'm using multiple sliders in a window, with customized Tick template. Sometimes when I change the DataContext I get following "Object reference not set to an instance of an object." exception:

at Telerik.Windows.Controls.RadTickBar.LoadTemplate(Double tickValue) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadTickBar.cs:line 402

at Telerik.Windows.Controls.RadTickBar.CreateTick(Double tickValue) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadTickBar.cs:line 352

at Telerik.Windows.Controls.RadTickBar.DrawTicks() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadTickBar.cs:line 231

at Telerik.Windows.Controls.RadSlider.RedrawTicks() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadSlider.cs:line 2904

at Telerik.Windows.Controls.RadSlider.OnMaximumChanged(Double oldMaximum, Double newMaximum) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\Slider\RadSlider.cs:line 1448

at System.Windows.Controls.Primitives.RangeBase.OnMaximumChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

at System.Windows.DependencyObject.OnPropertyChanged(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, OperationType operationType)

at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp)

at System.Windows.Data.BindingExpression.Invalidate(Boolean isASubPropertyChange)

at System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange)

at System.Windows.Data.BindingExpression.Activate(Object item)

at System.Windows.Data.BindingExpression.OnDataContextChanged(DependencyObject contextElement)

at System.Windows.Data.BindingExpression.HandlePropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)

at System.Windows.Data.BindingExpression.OnPropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)

at System.Windows.DependentList.InvalidateDependents(DependencyObject source, DependencyPropertyChangedEventArgs sourceArgs)

at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)

at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)

at System.Windows.TreeWalkHelper.OnInheritablePropertyChanged(DependencyObject d, InheritablePropertyChangeInfo info)

at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)

at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)

at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)

at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)

at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)

at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)

at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)

at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)

at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)

at System.Windows.DescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)

at System.Windows.TreeWalkHelper.InvalidateOnInheritablePropertyChange(FrameworkElement fe, FrameworkContentElement fce, InheritablePropertyChangeInfo info, Boolean skipStartNode)

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, OperationType operationType)

at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)

at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)

at System.Windows.FrameworkElement.set_DataContext(Object value)

Do you guys think you can provide a quick fix for this?

Thank you,
Ruben

Slider

answered on 08 Nov 2010

1 answer

64 views

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I'm trying to bind the SelectedIndex or SelectedItem properties of the RadTabControl to my viewmodel, but it's not working. It seems as if the binding doens't exist on the property, even though it's clearly there in the XAML.

Trying the exact same scenario with the standard WPF tabcontrol works fine (exaclty the same XAML, only the typenames are different).

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