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Data Binding Exception


nabils
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I am trying to bind to an IEnumerable<T> using chart.ItemsSource = data where data is the IEnumerable<T>. The xaml I am using is:

 <cfx:Chart Gallery="Pie" Name="chart">

<cfx:SeriesAttributes BindingPath="{Binding Path=Value}"/>

</cfx:Chart>

As soon as the chart.ItemsSource = data line is executed I get a recurring exception which hangs the whole application (see below). What am I doing wrong?

 Thanks

System.NullReferenceException: Object reference not set to an instance of an object.

at k.a(Object A_0, Type A_1, String A_2)

at at.a(Object A_0, Object A_1, Type A_2, Int32 A_3)

at cb.a(Object A_0, Object A_1, Type A_2, Int32 A_3)

at ChartFX.WPF.DataValues.a(IEnumerable A_0, Int32 A_1, Int32 A_2, NotifyCollectionChangedAction A_3, IIndexedCollection`1 A_4, ah A_5)

at ChartFX.WPF.DataValues.a(IEnumerable A_0, Int32 A_1, Int32 A_2, NotifyCollectionChangedAction A_3, ah A_4)

at ChartFX.WPF.DataValues.a(ah A_0)

at ChartFX.WPF.Chart.at()

at ChartFX.WPF.Chart.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Control.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Control.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Control.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

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xmlns:cfxData="clr-namespace:ChartFX.WPF.Data;assembly=ChartFX.WPF.Data" 

<

Page.Resources>  <XmlDataProvider x:Key="myXmlData">   <x:XData>   <Elems xmlns="">   <Elem Product="CocaCola" Image="pack://siteoforigin:,,,/Img/CocaCola.png" Month="Jan" Sales="12"/>   <Elem Product="Pepsi" Image="pack://siteoforigin:,,,/Img/Pepsi.png" Month="Jan" Sales="10"/>   <Elem Product="Pepsi" Image="pack://siteoforigin:,,,/Img/Pepsi.png" Month="Jan" Sales="1"/>   <Elem Product="Pepsi" Image="pack://siteoforigin:,,,/Img/Pepsi.png" Month="Feb" Sales="8"/>   <Elem Product="CocaCola" Image="pack://siteoforigin:,,,/Img/CocaCola.png" Month="Feb" Sales="14"/>   <Elem Product="Pepsi" Image="pack://siteoforigin:,,,/Img/Pepsi.png" Month="Mar" Sales="9"/>   <Elem Product="CocaCola" Image="pack://siteoforigin:,,,/Img/CocaCola.png" Month="Mar" Sales="13"/>   <Elem Product="Sprite" Image="pack://siteoforigin:,,,/Img/Sprite.png" Month="Mar" Sales="5"/>   </Elems>   </x:XData>  </XmlDataProvider>  <DataTemplate x:Key="productTemplate">   <StackPanel Orientation="Horizontal">   <Image Source="{Binding XPath=@Image}" Width="24" Height="24"/>   <TextBlock Text="{Binding XPath=@Product}" Margin="2,0" VerticalAlignment="Center"/>   </StackPanel>  </DataTemplate></Page.Resources>

<

cfx:Chart Gallery="Bar" x:Name="chart1">  <cfx:Chart.ItemsSource>   <Binding Source="{StaticResource myXmlData}" XPath="Elems/Elem" />  </cfx:Chart.ItemsSource>  <cfx:Chart.DataTransforms>   <cfxData:CrosstabTransform RowPath="@Month" ColumnPath="@Product" ValuePath="@Sales" Sorted="true"/>  </cfx:Chart.DataTransforms>  <cfx:Chart.AllSeries>   <cfx:AllSeriesAttributes ContentTemplate="{Binding Source={StaticResource productTemplate}}"/>  </cfx:Chart.AllSeries></cfx:Chart>

In this sample we are using the image in the data as part of the series content which will be shown in both tooltips and in the legendbox.

Regards,

JuanC

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