c# - 更新并刷新 wpf 图表

Question

我正在使用wpf工具包的图表，但无法查看图表插入的数据...这是xaml部分:

<chartingToolkit:Chart  Height="352" HorizontalAlignment="Left" Name="profilo_cale_chart" Title="Profili cale" VerticalAlignment="Bottom" Width="655" FontSize="16" Margin="252,0,0,55" Visibility="Hidden"> 
   <chartingToolkit:AreaSeries DependentValuePath="Value" IndependentValuePath="Key" IsSelectionEnabled="True" ItemsSource="{Binding}" Foreground="#FF242424" Background="LightSteelBlue" />
</chartingToolkit:Chart>

还有CS: 声明

public partial class MainWindow : Window
{ ...  
    List<KeyValuePair<DateTime, double>> valueList = new List<KeyValuePair<DateTime, double>>(); 
...

当用户选择两个日期时间并按下按钮时调用的模块

private void refresh_charts(DateTime dtStart, DateTime dtEnd)
{
    valueList.Clear();
    using (ModelFoosContainer mc1 = new ModelFoosContainer())
    {
        var res_mea = (from mea in mc1.MeasureSet where (mea.datetime>= dtStart && mea.datetime <= dtEnd) orderby mea.datetime descending select mea).Take(1000);
        foreach (Measure mea1 in res_mea){
            valueList.Add(new KeyValuePair<DateTime,double>(mea1.datetime, Convert.ToDouble(mea1.depth)));
        }
    }


    profilo_cale_chart.DataContext = valueList;
    //I've tried with this two but doesn't work..
    //profilo_cale_chart.Refresh();
    //this.UpdateLayout();

}

在此之后，图表具有正确且非空的 DataContext，但不显示值...有人知道我该如何修复它吗？

Answer 1

尝试为图表系列设置名称:

<chartingToolkit:AreaSeries Name="Example" DependentValuePath="Value" IndependentValuePath="Key" IsSelectionEnabled="True" ItemsSource="{Binding}" Foreground="#FF242424" Background="LightSteelBlue" />

然后，为 AreaSeries 设置 DataContext:

Example.DataContext = valueList;