绑定WPFToolkit图表时的System.NullReferenceException
绑定WPFToolkit图表时的System.NullReferenceException
提问于 2012-03-26 19:10:07
只要我在视图模型上的属性包含数据，WPFToolkit就会抛出异常，但当它为空时就不会了！
查看：
<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>
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));
}
}堆栈跟踪的顶部是：
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回答 1
Stack Overflow用户
回答已采纳
发布于 2012-03-27 16:45:18
这个解决方案非常牵强。在我的App.xaml.cs中，我为了本地化而改变了语言(我想用逗号作为小数点)，我这样做：
using System.Windows.Markup;
using System.Globalization;
var window = new MainWindowView();
window.Language = XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.IetfLanguageTag);
window.Show();显然，WPFToolkit不喜欢这样。
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原文链接：
https://stackoverflow.com/questions/9871022
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