折线图只有一个轴绑定List <KeyValuePair>

Question

那么，我有下一个问题 - 在页面上我有WPF工具包图表，折线图。

<chartingToolkit:Chart Grid.Row="1" Grid.ColumnSpan="2" Grid.Column="0" Name="lineChart" Visibility="Hidden" VerticalAlignment="Top" Height="150" BorderThickness="3" BorderBrush="#FF423852"> 
         <chartingToolkit:Chart.Axes> 
          <chartingToolkit:LinearAxis Orientation="Y" Minimum="0"> 
           <chartingToolkit:LinearAxis.MajorTickMarkStyle> 
            <Style TargetType="Line"> 
             <Setter Property="Stroke" Value="#bdb3ce" /> 
             <Setter Property="StrokeThickness" Value="1" /> 
             <Setter Property="Y1" Value="-4" /> 
             <Setter Property="Y2" Value="4" /> 
            </Style> 
           </chartingToolkit:LinearAxis.MajorTickMarkStyle> 
          </chartingToolkit:LinearAxis> 
         </chartingToolkit:Chart.Axes> 

         <chartingToolkit:Chart.Style> 
          <Style TargetType="Control"> 
           <Setter Property="Foreground" Value="#bdb3ce" /> 
           <Setter Property="Template"> 
            <Setter.Value> 
             <ControlTemplate TargetType="chartingToolkit:Chart"> 
              <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Name="BorderParent"> 
               <Grid> 
                <Grid.RowDefinitions> 
                 <RowDefinition Height="Auto" /> 
                 <RowDefinition Height="*" /> 
                </Grid.RowDefinitions> 

                <!-- Use a nested Grid to avoid possible clipping behavior resulting from ColumnSpan+Width=Auto --> 
                <Grid Grid.Row="1" Margin="5 15"> 
                 <Grid.ColumnDefinitions> 
                  <ColumnDefinition Width="*" /> 
                  <ColumnDefinition Width="Auto" /> 
                 </Grid.ColumnDefinitions> 

                 <primitives:EdgePanel x:Name="ChartArea" Style="{TemplateBinding ChartAreaStyle}"> 
                  <Grid x:Name="PlotArea" Canvas.ZIndex="-1" Style="{TemplateBinding PlotAreaStyle}"/> 
                  <Border Canvas.ZIndex="10" BorderBrush="#61596f" BorderThickness="1 0 0 1" Margin="5 2"/> 
                  <Canvas Background="Transparent" x:Name="activePointGridLines" Margin="5 0 0 0" /> 
                 </primitives:EdgePanel> 
                </Grid> 
               </Grid> 
              </Border> 
             </ControlTemplate> 
            </Setter.Value> 
           </Setter> 
          </Style> 
         </chartingToolkit:Chart.Style> 
         <chartingToolkit:Chart.LegendStyle> 
          <Style TargetType="Control"> 
           <Setter Property="Width" Value="0" /> 
          </Style> 
         </chartingToolkit:Chart.LegendStyle> 
         <chartingToolkit:Chart.PlotAreaStyle> 
          <Style TargetType="Grid"> 
           <Setter Property="Background" Value="Transparent" /> 
           <Setter Property="SnapsToDevicePixels" Value="True" /> 
          </Style> 
         </chartingToolkit:Chart.PlotAreaStyle> 
         <chartingToolkit:LineSeries IndependentValuePath="Key" DependentValuePath="Value" ItemsSource="{Binding}" DataContext="{Binding}" Margin="5.5,0,0,3" DataPointStyle="{StaticResource SeriesDataPointStyle}" Name="nLineSeries"> 
          <chartingToolkit:LineSeries.IndependentAxis> 
           <chartingToolkit:CategoryAxis Orientation="X" MajorTickMarkStyle="{StaticResource ChartMajorTickMarkStyle}"/> 
          </chartingToolkit:LineSeries.IndependentAxis> 
         </chartingToolkit:LineSeries> 
        </chartingToolkit:Chart> 

当我去这个页面线型图可以是空的，即使数据绑定到图表DataContext。我注意到，当图表为空时，它只有一个轴（Y轴）。当图表不为空时，绑定图表有2个轴后。

private void InitLineChart() 
    { 
     var valueList = new List<KeyValuePair<string, int>>(); 
     //fill List with data 
     _lineChart.DataContext = valueList; 
    } 

什么会导致这种行为和如何解决它？

Answer 1

问题已解决。

我已经删除IndependentAxis

从：

<chartingToolkit:LineSeries IndependentValuePath="Key" DependentValuePath="Value" ItemsSource="{Binding}" DataContext="{Binding}" Margin="5.5,0,0,3" DataPointStyle="{StaticResource SeriesDataPointStyle}" Name="nLineSeries"> 
     <chartingToolkit:LineSeries.IndependentAxis> 
       <chartingToolkit:CategoryAxis Orientation="X" MajorTickMarkStyle="{StaticResource ChartMajorTickMarkStyle}"/> 
     </chartingToolkit:LineSeries.IndependentAxis> 
</chartingToolkit:LineSeries> 

要：

<chartingToolkit:LineSeries IndependentValueBinding="{Binding Path=Key}" DependentValueBinding="{Binding Path=Value}" Margin="5.5,0,0,3" DataPointStyle="{StaticResource SeriesDataPointStyle}" /> 

现在没有数据绑定到图表的DataContext，但LineSeries到ItemsSource存在。

从：

_lineChart.DataContext = valueList; 

要：

var lineChartSerie = (LineSeries)_lineChart.Series.FirstOrDefault(); 
if (lineChartSerie != null) lineChartSerie.ItemsSource = valueList;