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WPFToolkitは、ビューモデルのプロパティにデータが含まれていても空になっていないと例外をスローします。WPFToolkitグラフをバインドするときにSystem.NullReferenceExceptionが発生する
VIEW:
<UserControl x:Class="ChartView"
xmlns:DV="clr-namespace:System.Windows.Controls.DataVisualization;assembly=System.Windows.Controls.DataVisualization.Toolkit"
xmlns:DVC="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit"
<Grid>
<DVC:Chart>
<DVC:Chart.Series>
<DVC:ScatterSeries ItemsSource="{Binding Data}"
DependentValueBinding="{Binding Path=Value}"
IndependentValueBinding="{Binding Path=Key}" />
</DVC:Chart.Series>
</DVC:Chart>
</Grid>
のViewModel:
public class ChartViewModel
{
public ObservableCollection<KeyValuePair<int, int>> Data { get; set; }
public ChartViewModel()
{
Data = new ObservableCollection<KeyValuePair<int, int>>();
//If I uncomment this, the error is thrown upon binding
//Data.Add(new KeyValuePair<int, int>(1, 10));
}
}
スタックトレースの上部には、次のとおりです。
at System.Windows.Controls.DataVisualization.Charting.ScatterSeries.UpdateDataPoint(DataPoint dataPoint) in C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\ScatterSeries.cs:line 179
at System.Windows.Controls.DataVisualization.Charting.DataPointSeriesWithAxes.OnDataPointActualIndependentValueChanged(DataPoint dataPoint, Object oldValue, Object newValue) in C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\DataPointSeriesWithAxes.cs:line 257
at System.Windows.Controls.DataVisualization.Charting.DataPointSeries.OnDataPointActualIndependentValueChanged(Object sender, RoutedPropertyChangedEventArgs`1 args) in C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\DataPointSeries.cs:line 1322
at System.Windows.Controls.DataVisualization.Charting.DataPoint.OnActualIndependentValuePropertyChanged(Object oldValue, Object newValue) in C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\DataPoint\DataPoint.cs:line 657
at System.Windows.Controls.DataVisualization.Charting.DataPoint.OnActualIndependentValuePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) in C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\DataPoint\DataPoint.cs:line 629