Hello,

I encountered the following error while navigating through a radTreeView Control with LoadOnDemand enabled. The error appears randomly and it's not connected to bounded data model.

We can provide test project solution if you tell us a valid email address.

Thank you very much.

The error is:

Message:

Object reference not set to an instance of an object.   at Telerik.Windows.Controls.RadTreeViewItem.get_NonParentItems()
   at Telerik.Windows.Controls.RadTreeViewItem.OnIsExpandedChanged(Boolean oldValue, Boolean newValue)
   at Telerik.Windows.Controls.RadTreeViewItem.OnIsExpandedPropertyChanged(DependencyObject sender, 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.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at Telerik.Windows.Controls.RadTreeViewItem.set_IsExpanded(Boolean value)
   at Telerik.Windows.Controls.RadTreeViewItem.ExpanderElement_Click(Object sender, RoutedEventArgs e)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Primitives.ToggleButton.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.CrackMouseButtonEventAndReRaiseEvent(DependencyObject sender, MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)

I am working on a application for my current employer, Sikorsky Corp., that is using a collection of 5,338  datapoints that I am binding to a radchart to generate a line serie. The problem is that the Telerik radchart line graph is taking between 7sec - 30sec to render on a machine having a Intel Core 2 Duo CPU executeing at 3.16 GHz, and having 3GB of RAM with Windows XP operating system.  How can I get radchart to perform much better then it is now current performing?  Was radchart line graph capability implemented using straight vanilla  WPF DataTemplate and/or overriding the OnRender method?  If it was implemented using straight vanilla WPF and/or overriding the OnRender method then this would explain the poor performance when dealing with large number of DataPoints.  What will need to be done is to implement the radchart line graph capability using DrawingVisual.  Please see link below on how to use DrawingVisual to implement charts that can deal with very large number of datapoints.

This is the property that I am binding to:

public

 

ObservableCollection<DataPoint> DataPoints

 

{

 

        get

 

        {

 

                return dataPoints;

 

        }

 

        set

 

        {

                dataPoints =

value;

 

                OnPropertyChanged(

"DataPoints");

 

        }

}

I set the ItemsSource property of my telerik chart to this DataPoints property as so:

<

 

telerik:RadChart x:Name="linePlot"  ItemsSource="{Binding Path=DataPoints}" >

 

 

 

        <telerik:RadChart.DefaultView>

 

 

 

            <telerik:ChartDefaultView>

 

 

 

                    <telerik:ChartDefaultView.ChartTitle>

 

 

 

                            <telerik:ChartTitle />

 

 

 

                    </telerik:ChartDefaultView.ChartTitle>

 

 

 

                    <telerik:ChartDefaultView.ChartLegend>

 

 

 

                            <telerik:ChartLegend Width="0" />

 

 

 

                    </telerik:ChartDefaultView.ChartLegend>

 

 

 

                    <telerik:ChartDefaultView.ChartArea>

 

 

 

                            <telerik:ChartArea>

 

 

 

                                    <telerik:ChartArea.AxisY>

 

 

 

                                                <telerik:AxisY MajorGridLinesVisibility="Visible" MinorGridLinesVisibility="Visible" />

 

 

 

                                    </telerik:ChartArea.AxisY>

 

 

 

                                    <telerik:ChartArea.AxisX>

 

 

 

                                                <telerik:AxisX />

 

 

 

                                    </telerik:ChartArea.AxisX>

 

 

 

                            </telerik:ChartArea>

 

 

 

                   </telerik:ChartDefaultView.ChartArea>

 

 

 

            </telerik:ChartDefaultView>

 

 

 

        </telerik:RadChart.DefaultView>

 

 

 

        <telerik:RadChart.SeriesMappings>

 

 

 

                <telerik:SeriesMapping>

 

 

 

                        <telerik:SeriesMapping.SeriesDefinition>

 

 

 

                                  <telerik:LineSeriesDefinition />

 

 

 

                        </telerik:SeriesMapping.SeriesDefinition >

 

 

 

                        <telerik:SeriesMapping.ItemMappings>

 

 

 

                                <telerik:ItemMapping DataPointMember="YValue" 
                                                                  FieldName="YPlotPoint" />

 

 

 

                                <telerik:ItemMapping DataPointMember="XValue" 
                                                                  FieldName="XPlotPoint"  />

 

 

 

                        </telerik:SeriesMapping.ItemMappings>

 

 

 

                </telerik:SeriesMapping>

 

 

 

        </telerik:RadChart.SeriesMappings>

 

 

 

</telerik:RadChart>

 

Link to DrawingVisual:

http://msdn.microsoft.com/en-us/magazine/dd483292.aspx

Hello.

Hi Telerik,

I was implementing the demonstration of loading/saving the GridView state from the demo application.
All worked well, the state was saved/loaded, except the GroupBy toolbar was not filled from the last state.

By implementing this.grid.UpdateLayout(); inside the Loadstate function solved my problem.

Is this the correct way?, Or should the example have worked 'out of the box'?

With kind regards,
Rob

Hello,

Hi,
i want to use the new Q1 2010 RadMap for WPF in a winforms project. Is this possible?
Can you give me a little step-by-step tutorial, because in my project i get no map.

I have use the same code in a wpf project, and there everything is alright.

Regards
Benjamin

Hi,
     I have a RadComboBox that is in a RadExpander which I have bound to a public property that returns a set of key value pairs.  I copied this same RadComboBox, renamed it, and placed it in a DataTemplate for a ListBox so when a User Selects the item in the ListBox the static text's visibility collapses and the editable fields are presented.  I am running into the problem where the RadComboBox doesn't bind.  The initial visibility of the RadComboBox is collapsed.  Any Ideas?

am using WPF rad controls trial version, i did a sample application and i deployed it. wen i run the application i cant see the application running. is it anything previliges like cannot deploy with trial version or something like that????

I had a problem with  Gauge  auto sizing.
When I assign the RadGauge control of width and height in NaN (the minimal width and height equal 0, VerticalAlignment and HorizontalAlignment – Center), I receive a control of 100 x 100 no matter what container I have (Grid, StackPanel, Canvas), though I expected to see the control of 0x0 size.
Can you tell me, why it happens? How can I avoid such situation and make auto sizing work correctly?