Sparkline in treelistview

2 posts, 0 answers
  1. Paul Lewis
    Paul Lewis avatar
    31 posts
    Member since:
    Jan 2010

    Posted 20 Jul 2011 Link to this post

    Hi,

    I was looking at putting a part line in my treelistview but when i added the control into the template i get the following error at design time and crash at runtime

    System.NullReferenceException
    Object reference not set to an instance of an object.
       at Telerik.Windows.Controls.Sparklines.DataPointsCollectionView.FindProjectedMemberType(String sourceMemberPath) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Controls\DataVisualization\Sparklines\Data\DataPointsCollectionView.cs:line 185
       at Telerik.Windows.Controls.Sparklines.DataPointsCollectionView.AdjustSourcePath(String& sourceMemberPath) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Controls\DataVisualization\Sparklines\Data\DataPointsCollectionView.cs:line 202
       at Telerik.Windows.Controls.Sparklines.DataPointsCollectionView.InitializeDescriptor(String sourceMemberPath, String projectedMemberPath) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Controls\DataVisualization\Sparklines\Data\DataPointsCollectionView.cs:line 190
       at Telerik.Windows.Controls.Sparklines.DataPointsCollectionView.TryInitializeDescriptor(String sourceMemberPath, String projectedMemberPath, SelectDescriptor descriptor) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Controls\DataVisualization\Sparklines\Data\DataPointsCollectionView.cs:line 161
       at Telerik.Windows.Controls.Sparklines.DataPointsCollectionView.UpdateDescriptor(String sourceMemberPath, String projectedMemberPath) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Controls\DataVisualization\Sparklines\Data\DataPointsCollectionView.cs:line 139
       at Telerik.Windows.Controls.Sparklines.RadSparklineBase.OnItemsSourceChanged(IEnumerable newSource) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Controls\DataVisualization\Sparklines\Base\RadSparklineBase.cs:line 651
       at Telerik.Windows.Controls.Sparklines.RadSparklineBase.ItemsSourcePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Controls\DataVisualization\Sparklines\Base\RadSparklineBase.cs:line 534
       at Telerik.Windows.PropertyMetadata.<>c__DisplayClass1.<Create>b__0(DependencyObject d, DependencyPropertyChangedEventArgs e) in c:\TB\117\WPF_Scrum\Release_SL\Sources\Development\Core\Controls\Common\System.Windows\PropertyMetadata.cs:line 208
       at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
       at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
       at System.Windows.DependencyObject.RefreshExpression(DependencyProperty dp)
       at System.Windows.Data.BindingExpression.SendDataToTarget()
       at System.Windows.Data.BindingExpression.SourceAcquired()
       at System.Windows.Data.BindingExpression.System.Windows.IDataContextChangedListener.OnDataContextChanged(Object sender, DataContextChangedEventArgs e)
       at System.Windows.Data.BindingExpression.DataContextChanged(Object sender, DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.OnDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.OnTreeParentUpdated(DependencyObject newParent, Boolean bIsNewParentAlive)
       at System.Windows.DependencyObject.UpdateTreeParent(IManagedPeer oldParent, IManagedPeer newParent, Boolean bIsNewParentAlive, Boolean keepReferenceToParent)
       at MS.Internal.FrameworkCallbacks.ManagedPeerTreeUpdate(IntPtr oldParentElement, IntPtr parentElement, IntPtr childElement, Byte bIsParentAlive, Byte bKeepReferenceToParent, Byte bCanCreateParent)

    <telerik:RadTreeListView x:Name="RadTreeListView1" RowLoaded="RadTreeListView1_RowLoaded"
                             AutoGenerateColumns="False" CanUserFreezeColumns="False"  ItemsSource="{Binding KpiItems, ElementName=Vm}"
                             IsReadOnly="True" RowIsExpandedChanged="RadTreeListView1_RowIsExpandedChanged">
        <telerik:RadTreeListView.ChildTableDefinitions>
            <telerik:TreeListViewTableDefinition ItemsSource="{Binding Items}" />
        </telerik:RadTreeListView.ChildTableDefinitions>
        <telerik:RadTreeListView.Columns>
            <telerik:GridViewDataColumn Header="Name" DataMemberBinding="{Binding Label}"/>
            <telerik:GridViewDataColumn Width="6*" IsResizable="False" Header="actuals Visits" TextAlignment="Center">
                <telerik:GridViewDataColumn.CellTemplate>
                    <DataTemplate>
                        <telerik:RadLinearSparkline ItemsSource="{Binding sl}" XValuePath="VisitDate" YValuePath="NumberOfVisitsField"  />
                    </DataTemplate>
                </telerik:GridViewDataColumn.CellTemplate>
            </telerik:GridViewDataColumn>
     
        </telerik:RadTreeListView.Columns>
    </telerik:RadTreeListView>

  2. Vladimir Milev
    Admin
    Vladimir Milev avatar
    1061 posts

    Posted 25 Jul 2011 Link to this post

    Hello Paul Lewis,

    It looks like most probably you have misspelled your YValuePath or XValuePath and it is not matching the property name of your data object. If your problems persist, please send us a small runnable project illustrating the issue and we will take a closer look for you.

    Regards,
    Vladimir Milev
    the Telerik team

    Register for the Q2 2011 What's New Webinar Week. Mark your calendar for the week starting July 18th and book your seat for a walk through of all the exciting stuff we will ship with the new release!

  3. DevCraft banner
Back to Top